JP2823155B2 - Image processing system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION   The present invention relates to an image for processing an image as an electrical image signal.
It relates to a processing system.   Conventionally, images are converted into electrical signals and transmitted.
Alternatively, image processing such as storage has been proposed.   By the way, an A3 size image is converted to 2 with 400 dpi resolution.
Approximately 4 Mbyte of image signal is used to represent
It is. Therefore, in order to store this image signal,
Both require a memory with the same number of bytes of storage capacity
You.   Therefore, consider compressing the image when storing it.
available. According to this, the data amount of a general image is 1/10
Use a relatively small amount of memory.
Will be.   Also, images compressed and stored in this way
It is conceivable to combine another image with
However, the two images must be accurately aligned and combined.
Is difficult.   The present invention has been made in view of the above points, and a first
Satisfactorily forms a composite image of the original image and the second original image
In detail, the first and second manuscript images are
Input means for inputting the first and second image signals to be represented for each line
And a step for compressing the first image signal input from the input means.
Compression means for compressing, and a first compression means compressed by the compression means.
Storage means for storing the image signal of
Decompressing the output compressed first image signal,
Decompressing means for outputting the output first image signal line by line
And a first image output line by line from the decompression means
Signal and a second image input line by line from the input means.
Combines image signals and outputs a combined image signal line by line
A synthesizing unit, and a combination output from the synthesizing unit for each line.
A composite image of the first and second original images is formed based on the composite image signal.
Image forming means for forming each line;
Is a line synchronized with the image formation for each line of the image forming means.
The first compressed image signal is synchronized with the in-sync signal.
Signal for each line, and the input means
In synchronization with the in-sync signal, the second image signal is
Input means, and the synthesizing means further comprises:
Vertical synchronization signal indicating the start of input of the second image signal from the stage
Counting means for counting the line synchronization signal from the input of
The count value of the line synchronization signal by the counting means
Image for controlling the start of the decompression operation by the decompression means based on the
An image processing system is provided.   Hereinafter, the present invention will be described in detail with reference to the drawings.   FIG. 1 shows an image processing system to which the present invention is applied.
Image reader (hereinafter referred to as reader) 1-1, image reader
Storage device (hereinafter referred to as RMU) 1-2, image forming device (hereinafter referred to as RMU)
(Referred to as a printer) 1-3.   Image signal read by reader 1-1 as main function
Function to form an image on the printer 1-3 with the reader 1
-1 is input to the memory to store the image signal read in -1 to RMU1-2.
Function, the image signal stored in the memory of RMU1-2.
Memory printout for forming an image in printer 1-3
Function.   Each device is connected via the video interface described later.
Has been continued.   The leader 1-1 is, for example, as shown in FIGS.
CCD line sensor with a light receiving element of about 500 bits 3-
1, the original on the original platen 2-1 is decomposed into a plurality of pixels and
Bit cereal that is read for each input and indicates the dark flame of the original image
Output the binary image signals VDA and VDB. Fig. 2
One line reading by the CCD 3-1 is the main scanning reading 2
-2, substantially perpendicular to the main scanning direction of the main scanning read line.
The movement in the straight direction is the sub-scanning 2-3.   FIG. 3 is a simple configuration diagram of the reader.
Reflection obtained from an original by an illumination system (not shown)
Light is emitted for one main scanning line by the CCD line sensor 3-1.
It converts to bit serial image electric signal. CCD3-1
Analog image signal according to the intensity of the reflected light from the original
The signal has a plurality of bits for each pixel by the A / D converter 3-2.
Is converted into a digital image signal. The daisy
The converted image signal is converted to a binary comparator 3-3, 3-4.
Is generated from the threshold generators 3-5 and 3-6.
It is compared with the binarized threshold signal, respectively, and the binary of 1 or 0 of the two systems
It is output as coded image signals VDA and VDB.   Suppose analog input from A / D converter 3-2
Image signal is converted to a 6-bit digital image signal
Then, 64 density levels having values of 0 to 63 are obtained.
For example, the threshold from the threshold generator A3-5 is 42, the threshold generator
Assuming that the threshold from the energizer B3-6 is 21, the binarized comparator
The binary image signals VDA and VDB from the lators 3-3 and 3-4 are as follows.
It looks like below. That is, from the A / D converter 3-2
VDA = 0, VDB = 0 when A / D output is 0-20, A / D converter
When the output from the data 3-2 is 21 to 41, VDA = 0, VDB = 1,
When the output from the A / D converter 3-2 is 42 to 63, VDA =
1, VDB = 1, and the image signal from the original is the reflection density
, VDA = 0, VDB = 0, VDA = 0, VDB = 1,
VDA = 1 and VDB = 1. Therefore, the image signal is
It is output from the reader in three values for each element. Note that the threshold energy
Equalize the threshold from the generator A and the threshold generator B
Thus, a binary image signal is output.
Further, the threshold comparators 3-5 and 3-6 are conventionally known.
Generating a Dither Matrix Threshold by the Dynamic Dither Method
It can also be used to produce halftones with ternary image signals of VDA and VDB.
Can also be expressed.   RMU1-2 in FIG. 1 is an image storage device as described above.
You. Inside it encodes the image signal from the reader
A compression circuit 1-2-1 for performing compression processing, and an encoded image
A compressed image memory 1-2-2 for storing signals, a compressed image
Read the compressed image signal from the memory 1-2-2 and decode it
Decompressing circuit 1 for decompressing to a bit serial image signal
2-3.   The printer 1-3 is a well-known electrostatic recording device.
Fig. 4 shows a laser beam printer using the recording process.
Shows a schematic diagram. In FIG. 4, 4-1 is related to the predetermined axis.
4-2 is a photosensitive drum that rotates by rotating the image signal
The laser driver that converts light ON-OFF, 4-3
The laser light emitted from the laser driver 4-2
A polygon scanner that scans in the axial direction of the photosensitive drum 4-1
-, 4-4 are photosensitive dots formed by scanning with laser light.
A developing unit for developing the electrostatic latent image of the ram 4-1 with toner;
4-5 is a print paper cassette, 4-6 is a print paper
Pull out the print paper one by one from cassette 4-5.
Lint paper pick-up roller, 4-7 for printing
A resist that feeds paper in synchronization with the rotation of the photosensitive drum 4-1
4-8, a toner image on the photosensitive drum 4-1.
Transfer unit to transfer to print paper, 4-9
Fix the toner image transferred on the printing paper to the printing paper.
Fixing unit 4-10 is a printer on which the toner image is fixed.
This is a paper discharge tray from which paper is discharged.   An image signal, which is an electrical signal in the printer,
The operation embodied on the paper will be described with reference to FIG.
You. 2 systems input from video interface 5-11
Binarized image signals VDA and VDB are ternary-valued by a synthesizing circuit 5-10.
(VD signal) and input to the laser driver 5-3.
The laser beam based on the VD signal by the semiconductor laser 5-4.
Is converted. The laser light is passed through a collimator lens 5-5.
Focused and rotated by polygon mirror 5-6
Scan in a direction substantially parallel to the rotation axis of the photosensitive drum 5-2.
Is done. The scanned laser light is applied to the f-θ lens 5-
7, the scanning position is corrected and irradiated on the photosensitive drum 5-2.
To form a latent image based on the VD signal.   Printer image formation uses the so-called electrostatic recording method
And charges the electric charge applied on the photosensitive drum 5-2 with laser light.
And remove the necessary parts with a developer.
And transfer and fix it on print paper.
U. Since electrostatic recording is a well-known technology,
Description is omitted.   Now, it is scanned by the polygon mirror 5-6.
The laser beam is irradiated with light before being irradiated on the photosensitive drum 5-2.
The light enters the eye bar 5-8, and the light detector 5-9
, An electric signal (BD signal) is output.   The image signal output device detects the laser beam after the BD signal is generated.
Wait for the time to reach the optical drum 2-2, then wait for the VD signal
Is output, a latent image is formed at an appropriate position on the photosensitive drum 2-2.
Is formed.   Video interface for connecting each device in Fig. 1.
This is called an interface, and its schematic diagram is shown in FIG.   The video interface is connected to the image output device 6-1 and the image.
An interface for connecting the receiving device 6-2.
The above-mentioned reader is a typical example of an image output device.
There is a printer as the receiving device. Image storage device of FIG.
(RMU) 1-2 receives image for reader 1-1
Device, and an image
It is positioned as an image output position.   The video interface is bit serial as described above.
Video signals VDA and VDB, and
Line synchronization signal from the image receiving device as a control signal
Signal BD, one page of output image signal from the image output device
VSYNC which is an inter signal, and video which is an interval signal of one line
Synchronization signal consisting of rice clock (VE) and image clock VCLK
Transmitted.   These image / image synchronization signals have the phase relationship shown in FIG.
When the image output device receives the BD signal, the BD signal shown in FIG.
From the light receiving end of the optical fiber 5-8, which is the signal generation position
Time to image effective area of drum 5-2 (left merge
), The image signals VDA, VDB for one line
And the section signal VE. Signal VE, VDA, VDB
VDA and VDB are synchronized with the clock VCLK.
Synchronized with the clock VCLK, the ternary image is synthesized as the recorded image VD.
And transmitted to the laser driver.   In addition, the video interface represents control information.
Connect signals (DCNCT) of each device as control signals
Parallelism indicating that the control unit of the device is operating normally
Day (DPRDY), output paper feed state of the image receiving device
(PREQ) indicating that the paper is output from the image output device
Signal (PRINT), an image request signal (XSR
EQ) is transmitted. In addition, the control signal
The paper size information of the paper feed stage, the connection status of various devices, and detailed
Error information.   FIG. 8 shows various signals transmitted through the video interface.
List of name, abbreviation, transmission direction, signal classification and content of signal
Shown as a table.   The outline of the components in the present embodiment has been described above.
However, based on that, explanation of image coding in RMU1-2
I do.   The image signal from the reader is bit-serial image information.
There is a resolution of 400 dpi (400 dots per inch)
The scanned image information is a 3.7 Mbyte memo
It becomes the capacity. This is 64K bytes of DRAM, equivalent to 574
Information and unrealistic in terms of mounting and price
Then, the image is compression-encoded and stored in the memory 1-2-2.
You.   Image information from the reader is compressed by the image compression unit 1-2-2.
Although compression processing is performed, in this embodiment,
The length method is used. Run-length method
Use the counter to count the number of consecutive "1" or "0" states.
The counting result is handled as an image signal.
FIG. 9 shows the format of the run-length encoding in the embodiment.   Format of run-length cord in this embodiment
Consists of 1 byte (8 bits) as shown in (9-1).
The encoded data of the image is a 7-bit binary data in bits 6 to 0
It is expressed by an equation. Also, in the 7-bit binary format,
Length (number of consecutive 1/0) ranges from 0 to 127 bits
Can not be expressed, so run run of 128 bits or more
In the case of NG, it is represented by a 2-byte configuration. In this case two bars
One of the units represents a run length that is an integral multiple of 128 bits.
Make up code (hereinafter referred to as M code)
The remaining 1 byte represents a fraction from 0 to 127 bits.
The terminating code (hereinafter referred to as T code)
You. This makeup code and the termination code are separated.
To distinguish, as shown in (9-1), bit 7 is used as an identification flag.
1 indicates an M code, and 0 indicates a T code.   The run-length encoding of the present embodiment is mainly used for A3 size originals.
4677-bit image signal of 1 line for 297mm scanning length is white signal
No. 5 bit continuous and black signal 4672 bit continuous white / black pattern
A description will be given by taking an example of a case in which the   First appear in the run-length method in this embodiment
White 5 bits are encoded using T code as in (9-3)
Be transformed into The following black 4672 bits are 128 or more
Is composed of an M code and a T code.
As shown in (9-4), 36 is represented by binary code, and T code and
Then, as shown in (9-5), 64 is expressed in binary. You
That is, M code (128 × 36) + T code (64) = 4672
Will be encoded. As explained above,
The image signal of one line of 4677 bits is (9-3),
It is represented by three bytes (9-4) and (9-5).   Also shown in (9-2) as a signal for one line break
EOL code (End of Line code) is used. this
The EOL code is similar to the M code because bit 7 is 1.
However, if bit 6 to bit 0 are all 1 in the M code,
This means a continuation of an image signal of 16256 bits.
In this embodiment, the data length of one line is up to 4677 bits
In M code, bit6 is always 0, so
M code where all bits become 1 in run-length encoding of
No EOL code and M code are clear
Is distinguished.   This EOL code is added to the above-mentioned white 5 bit black 4672 bit
The image signal of one line of 4677 bits is about 1/14 of the original signal.
It can be written to memory with 4 bytes of data equivalent to 6
And Note that this encoding method uses data indicating white or black.
Do not have in the code. Instead, one line of data
Must start with a white code. And
Shows the change of data from white to black and black to white for T code
Also used as code. If one line starts from black
If you want to use T code 0 representing white 0 before black code
You. Also, if the sequence of images is an integer multiple of exactly 128,
Even if it can be encoded only with
A T code 0 representing white 0 is attached.   This embodiment will be described in detail with reference to FIG.   FIG. 10 is a diagram showing a detailed configuration of the system shown in FIG.
The leader 10-1 is the leader 1-1 in FIG.
In addition, the printer of 10-3 becomes the printer of 1-3, and the printer of 10-4
The compression circuit is 1-2-1 and the compressed image memory of 10-5 is 1
-2-2, 10-6 decompression circuit in 1-2-3
Yes, it is. 10-2 is a controller and micro
Consists of a processor and peripheral I / O port devices
And serial communication with the reader 10-1 and printer 10-3.
Input / output of various video interface control signals, RM
U Control of internal selector, counter, comparator, etc.
Setting of constants, generation of various timing signals, RMU internal
It has functions such as capturing status.   The compression circuit 10-4 receives the image signal from the reader 10-1.
A circuit that compresses line by line using the run-length method described above.
is there.   10-5 is generated by the compressed image memory compression circuit 10-4.
Writes run-length code and expands 10-6
And supply the read code.   The decompression circuit 10-6 is a run-level from the compressed image memory 10-5.
Decompressing the source code into bit-serial image data
Circuit.   10-7 is the EOL code detection circuit,
Error detection, EOL error repair, EOL code skipping
The image is reduced in the sub-scanning direction at the time of expansion. Also, EO
The L detection circuit is a sub-scanning extension section from the controller 10-2.
This circuit operates only when the inter-signal V-DEC is asserted.
Yes, EOL detection when signal V / DEC is negated
Buffer enable, which is the output signal of circuit 10-7
(Buff CHG ENB) signal and data enable (Date EN
B) The signal is fixed at high (H) level, and the DRP2 signal is
-(L) level.   10-8 is a memory address counter for up counting.
Work and addressing of the compressed image memory 10-5.
U. This counter is written and read by the controller 10-2.
Start address can be set, and counter output
Force can be read by controller 10-2
Configuration. The count clock of this counter 10-8
Shia compression circuit 10-4, decompression circuit 10-6, EOL detection circuit 10
The DWP signal, DRP1 signal and DRP2 signal from -7 are output to NOR gate 10
Given through -29.   Reference numeral 10-10 denotes a dither counter having the configuration shown in FIG.
The dither counter in this embodiment is a three-bit 13-1 bit.
Counter and 13-2 10-bit down counter, 13
-3 10-bit comparators. 13−
3 and 13-2 down counters for a total of 13 bits
Supply dress signal DADR to double buffer memory 10-15
You.   10-11 is a line counter, which is connected to the controller 10-2.
Count the number of lines set in
A signal is generated on the controller 10-2.   10-12 is the main scanning counter and decoder, and the pressure for each line
It generates a section signal H-AREA for contraction and extension,
Generates a start signal DCSTART for the
Generates address (HATR) to buffer memory 10-15
Or the image signal from the double buffer memory 10-15.
Generates a signal to trim (TRM). Fig. 12 shows main scanning
The detailed configuration of the counter and the decoder 10-12 is shown.   In FIG. 12, 14-1 is a 13-bit down counter.
The count start value is set by the controller 10-2.
The counting starts when the START signal is input. 14-2 to 1
4-8 are 13-bit comparators, respectively.
The value of 1 is equal to the value respectively set by the controller
An A = B output is generated when the power supply is turned off. 14-10 to 14-12 are
14-2 to 14-7 comparators in flip-flop
Set and reset by output.   10-14 is a memory address counter
10-8 Up-count output M-ADR and controller 10
Compare the set value from -2. A of comparator 10-14
Controller 10-2 by signal MOVER with B output
Is the memory address counter 10-8 is the comparator 10-14
Is reached. Also in this state MO
When the VER signal goes to logic state 1 (hereinafter referred to as H level)
As a result, the CLK input of the memory address counter 10-8 becomes N
Memory address count prohibited by OR gate 10-30
The count-up operation of the data 10-8 stops.   10-15 is the memory for one line each of memory X and memory Y.
This is a double buffer memory consisting of memory
In the memory Y, the read operation and the write operation are reversed.
You. This buffer switching is performed by inputting the Buff CHG signal.
The read address signal and the write address
The signal is the DADR from the dither counter 10-10 and the main scan count.
HADR from the data decoder 10-12 is used as appropriate.   10-16 is a video for outputting the expanded image signal to the printer.
The internal clock generator that generates the clock
Clock ICLK is generated in synchronization with the signal.   Reference numeral 10-17 denotes a horizontal synchronizing signal generator, which is a video interface.
Approximately the same frequency as BD input from the printer via Ace
Output the IBD signal. Video in from printer 10-3
BD signal P-BD specified by turface is not input
In this case, select this IBD signal with selector SEL510-22.
The main scanning synchronization signal HSYNC inside the RMU is
Used as BD signal R-BD.   10-18 is φ_SYSClock selector and leader
Video clock R-VCLK from the internal clock generator
The I-CLK from 10-16 is transferred to the finger from controller 10-2.
Select as indicated.   10-19 is the write data to the double buffer memory 10-15.
Data signal R-VD from the reader
A to control the expanded image signal DVDO from the expansion circuit 10-6.
Select according to the instruction from the dealer 10-2.   10-20 is the count of the main scanning counter decoder 10-12.
As start signal and clock input of line counter 10-11
The selector of the used LN-ST signal is a selector SEL510.
HSYNC signal from -22 and R-VE signal from reader
Select according to the instruction from the controller 10-2.   10-21 is a selector for the VE signal P-VE going to the printer,
OVE signal equivalent to VE from main scanning counter / decoder
And the VE signal R-VE from the reader to the controller 10-2
Select according to instructions from.   10-22 is the HSYNC selector as described above.
The selection is made according to an instruction from the roller 10-2.   10-23 is an image signal P-VDA output to the printer 10-3.
And P-VDB selector controlled by controller 10-2
Is controlled. A0 and B0 inputs of video selector 10-23 are
Image signal R-VDA from the A0 and B0 inputs
Selects the image signal P-VD to the printer.
R-VDA from reader is connected to both A and P-VDB
That is, the recorded image VD output to the printer is shown in FIG.
As is clear from the above, a binary image is obtained.   A1 input and B1 input are selected by video selector 10-23
Then, the image signal P-VDA going to the printer contains
Image signal R-VDA is output from the
The image signal R-VDB from the reader is further AND gated 10-34
Is output. This AND gate 10-34
The other input signal ▲ ▼ is controller 10
-2. This ▲ ▼ is H level
If the image signal P-VDB goes to the printer if it is
The same signal as the image signal R-VDB from
The recorded image VD that is input from the reader as shown in FIG.
Is an image obtained by synthesizing the image signals R-VDA and R-VDB.   ▲ ▼ signal is logic state 0 (hereinafter “L level”
Image signal P-VDB going to the printer
Is fixed at the L level. For this reason, we can see from Fig. 7.
The image signal VD output to the printer is one pixel (one video).
Okrok) VDA signal of about 50% duty for the section
The number is recorded on the output paper. This is a ▲ ▼ signal
When the level is L level, the laser
Lighting time of laser light emitted from nit 5-4
This means that the R-HALF signal is set to L level.
About 50% of the image signal from the reader
An image density is obtained.   A2 input and B2 input are selected by video selector 10-23
And the image signal P-VDA going to the printer is a double buffer
The output from the memory 10-15 is passed through the AND gates 10-27 and 10-28.
Signal RMU-VD. Image signal going to the printer
P-VDB further passes signal RMU-VD through AND gate 10-32.
Signal. The other input of this AND gate 10-23
▲ ▼ is the signal from controller 10-2
And this ▲ ▼ signal is at H level.
If the image signal P-VDB goes to the printer, the same signal as R-VDA
And the recorded image VD output to the printer is shown in FIG.
As can be seen, the image is a binary image based on the image signal RMU-VD.
If the ▲ ▼ signal is at L level, the printer
Is fixed at the L level. sand
That is, the image from the double buffer memory 10-15 is stored in the R-VDA.
The image signal RMU-VD is transmitted, but the P-VDB remains at L level.
Figure 7 shows the image signal VD output to the printer
As can be seen from the figure, one pixel (one video clock) section
About 50% of the image signal on the output paper
Is recorded. This is when ▲ ▼ signal is L level
In the case of H level, the laser unit 5-
The ON time of the laser light emitted from 4 is about half
And set the ▲ ▼ signal to L level.
As a result, an output image density of about 50% can be obtained.   A3 input and B3 input are selected by video selector 10-23
And the OR gates 10-31 and 10-32 to the printer.
The image signals R-VDA and P-VDB are the image signals R from the reader.
-Images from VDA, R-VDB and double buffer memory 10-15
The signal RMU-VD is synthesized. Where ▲
▼ signal, ▲ ▼ signal arbitrarily
Image signal output to printer by combining
VD is as shown in Table 1.   10-25 is the Buff CHG ENB signal from the EOL detection circuit 10-7
LN-ST signal (by enabling double buffer switching)
Gate and double buffer memory 10-15 read buffer
Generates a buffer signal Buff CHG
It is a two-input AND gate.   10-35 is a decompression error counter and a decompression circuit of 10-6
Is counted.   The basic functions of the present embodiment configured as described above are as follows.
The four below. (1) (Binary compression)   Image signal R-VD with fixed threshold value from reader 10-1
Any part of A is subjected to binary compression processing, and the compressed image memory 10-
Function to write to 5. Note that the image signals of the entire original area
This is an application of writing to -5. (2) (Dither compression)   Image from the dither matrix threshold from reader 10-1
An arbitrary part of the image signal R-VDA is subjected to dither compression processing to
Function to write to image memory 10-5. (3) (Binary extension)   Binary compressed image stored in compressed image memory 10-5
Is read, subjected to binary decompression processing, and output to the printer 10-3.
Function to do. (4) (Dither extension)   Dither compressed image stored in compressed image memory 10-5
Reads the image, performs dither expansion processing, and sends it to the printer 10-3.
Function to output.   Hereinafter, specific operations will be described in order. (1) Binary compression function   The image signal input from the reader is mainly
The VE signal representing one scanning line is transmitted as a synchronization signal.
Come. The sub-scanning section for one page is generated by the VSYNC signal.
The interval is represented. This VE signal is represented by R-VE in FIG.
Expressed as a signal.   The image compression method in this embodiment is an image compression method in the main scanning direction only.
Encoding of image data and image compression in the sub-scanning direction
Absent.   The following is transmitted from the reader as shown in Fig. 13.
A3 size (Main scan 297) with resolution of 400dot / inch (400dpi)
mm (corresponding to 4677 bits), sub-scanning 420 mm)
70 mm in the main scanning direction and 100 mm in the sub scanning direction from the point
140mm × 210mm image information B is trimmed and binary compressed
The case will be described as an example.   Before receiving the above image data from reader 10-1
The controller 10-2 controls the mode setting of each part inside the RMU.
Do.   The image signal R-VDA sent from the reader 10-1 is
Clock φ used inside the RMU for compression processing_SYSage
To select clock R-VCLK from reader 10-1
10−18 Set SEL1.   The image signal R-VDA input from the reader 10-1 is
It is stored for each line in the shared double buffer memory 10-15,
The output is input to the compression circuit 10-4. Therefore,
The image data input to the bull-buffer memory 10-15 is R
-Set 10-19 SEL2 to be VDA.   Next, the synchronization signal LN-ST for each line is set.
Is used to use the R-VE signal from the reader 10-1.
Set 20SEL3. In addition, leader 10-1 issues R-VE.
Requires an R-BD signal as a synchronization signal to generate
That was mentioned in the description of the video interface.
IBD from horizontal synchronization signal generator 10-17 as R-BD signal
Set 10-22SEL5 to output a signal.   Next, the down-counting of the main scanning counter / decoder 10-12 is performed.
Control 4677 bits of image data for one line in the data 14-1
Set the count start value 4677 so that it can be used.   The setting of the main scanning direction of the area B in FIG.
Perform on -4 and 14-5. That is, these two comparators
The flip-flop that is set and reset by the output of
The H-AREA signal from 11 is supplied to the compression circuit 10-4,
The compression circuit 10-4 outputs an image during the main scanning section when this signal is at the H level.
Run-length encoding of image data and compression image memory
Write to 10-5. Therefore, the comparator 14-4
131102 equivalent to 70mm margin in the main scanning direction up to the area B in FIG.
Set 3575, which is the value obtained by subtracting the bit from 4677. Again
The main scanning width of the area B is 140 mm.
Subtract 2204 bits from 3575 and set 1371
You.   Dither by output DCSTART from comparator 14-8
The counter 10-10 starts to move.
The counter and the dither counter 10-10 simultaneously
Therefore, 4677 is set to the comparator 14-8.   The following constants are set in the dither counter 10-10.
That is, the counter 13-1 and the counter 13-2 have a count start value of 4677.
And set the Difhe signal to perform binary compression.
Set to L level. This causes the dither counter 10-10 to
The same operation as the counter 14-1 is performed.   By setting the above constants, double buffer memory 10-15
The given two addresses DADR and HADR are both R-VE signals
Will count down from 4677
You. That is, the compression circuit 10- is provided by the double buffer 10-15.
The image signal EVDO given to 4 is the image signal from the reader
The signal is delayed by one line from the R-VDA.   Decompression provided to decompression circuit 10-6 and EOL detection circuit 10-7
Since the start signal V-DEC is at L level, the DRP1 signal DRP2
The signal is at L level and the Buff CHG ENB signal and Data ENB signal
The signal becomes H level and the expansion circuit 10-6 and the EOL detection circuit 10-7
Are configured not to affect the compression operation.   Furthermore, the compressed image memo is stored in the memory address counter 10-8.
Set the write start address for the memory 10-5.   In this state, the controller 10-2 sends VS from the leader.
Have YNC input. When VSYNC is input,
The controller 10-2 has a sub-scanning length of 10 to the area B in FIG.
In order to count 0mm, 1574 lines equivalent to 100mm
Set to counters 10-11. Line counter 10-11 is LN-
Count down by ST signal, that is,
When the main scanning section signal R-VE is input 1574 times,
Counter 10-11 sends the count-up signal to the controller 10
-2, the controller is the image signal from the reader
Is detected in the area B. Thereby controlling
The video signal to cause the compression circuit 10-4 to start image compression.
-Change ENC from L level to H level and B area
Line counter 10-1 to measure the sub-scan length of 210 mm
Set 3307 corresponding to 210mm for 1. From the leader
When an R-VE signal of 3307 lines for the B area is input, the line is
Counters 10-11 count up again and control
Error 10-2 detects this and sets the V-ENC signal to H level.
From the compression circuit 10-4 to the L level.
Stop the operation.   Thus, the input is continuously input from the reader 10-1.
The image signal R-VDA has a main scanning counter deco in the main scanning direction.
H-AREA emitted from the radar 10-12
In the section and sub-scan direction, the controller 10-2 emits
V-ENC is trimmed to an arbitrary section of H level.
The compressed image memory 10 is encoded by the compression circuit 10-4.
Written to -5.   This is shown in FIG. R-VDA in FIG.
Is an example of the input of an image signal of a certain line.
White 2 bits as image signal in trimming area
Shows the case where black, 2204 bits, and 5 white bits are input.
ing. This R-VDA input allows the compression circuit 10-4
Thus, a 5-byte run length code is generated. Sand
First, 2H T code by the first white 2 and then by the black 2204
M code 91H, T code 15H, 5H T code with last white 5
And the end of GH-AREA generates an EOL code.
The write request DWP pulse from the compression circuit 10-4.
The data is written to the compressed image memory 10-5.   Note that addressing compressed image memory 10-5
Readdress counter 10-8, and DWP pulse is applied to gate 1
It counts up by the signal passed through 0-29 and 10-30.   If the image signal R-VDA from the reader changes dramatically,
When a large amount of compressed code MW code is generated, the compressed image
Not all compressed code MW codes can be written in Mori 10-5
A situation arises. Further, as shown in FIG. 15, the compressed image memory 10
When writing multiple pages of compressed image data in -5,
A part of the compressed image data T written before is new
Damaged by the compressed image data U written to
Situation arises. In this embodiment, compressed image data is written.
Sometimes it is detected that it has exceeded the writable empty area
Comparator 10 to protect other compressed data.
14 is used to monitor memory usage.   In FIG. 15, the compressed image S (end) is stored in the compressed image memory.
Address SE) and the compressed image T (start address TS)
The pressure between address SE and address TS is stored
When writing a reduced image U, the controller 10-2 writes
Based on the end address SE of the compressed image S
And set it to memory address counter 10-8.
The start address TS of the compressed image T is compiled as a limiter.
Set to lator 10-14. Write proceeds and address
The count output of the counter 10-8 is output from the comparator 10-14.
A ≦ B output of the comparator is generated when the TS value of
New write request pulse DWP at gate 10-30
Is gated, the memory address counter stops, and
Operation is prohibited. This protects the compressed image T.
It is. Is the controller 10-2 a comparator 10-14?
M where A ≦ B output_OVERThe compressed image is
Detects that it was not possible to write to the memory 10-5 and compresses the image.
An error occurred and the memory area where image data could not be written
As an empty area and prohibit the image from being output from memory
At the same time, the effect is displayed on the display unit of the reader.   The controller 10-2 outputs the Mover signal at the end of image compression.
And detects that the Mover signal has not been generated.
If the image compression writing is successful, the
Read the address output MADR from the address counter 10-8
As the end address of the compressed image written this time.
Controller's internal memory to store the next compressed image.
Used to set the write start address.   Similarly, the memory address counter 10-8 was set.
The controller also holds the write start and end addresses.
This is used when decompressing and outputting compressed image data.   When encoding the image of the entire original and storing it in the memory,
In this case, the trimming area may be set to the size of the original. (2) Dither compression function   The image signal input from the reader 10-1 is
In the case of the halftone expression by the method, the image changes
Intense, and in the main scanning direction as used in this embodiment.
Image compression methods that encode the continuity of
It is difficult to perform effective image compression.   In this embodiment, the periodicity of the dither pattern is used to
The compressed image signal is effectively compressed.   In FIG. 16, the dithered image signal is (16−
It is input from the reader 10-1 as in 1). This embodiment
Now we use an 8x8 dither matrix per block
The details are shown in block a of (16-2). Temporary
The image signal read from the reader is uniformly
If the threshold value of the dither matrix is
A black signal is output at 32 or more, and the (16-2)
The image as schematically shown in (16-1) by the matrix
Get an image. 4 blocks in the main scanning direction with the image signal of (16-1)
(16-2) is an enlarged version of Tsuku alone. Where H
The signal of the main scanning line indicated by is the RVDA signal of (16-4).
Thus, eight state changes occur during four blocks.
The number of times this state change is proportional to the number of blocks, A4 width 297m
With m, 1168 times of state change will occur,
Guss encoding leads to 1170 bytes of encoded data
I will. This 1170 bytes is about twice the original image size of 4677 bits
The amount of image information increases because of the amount of data
And   Then, the image signal obtained from the H line of (16-2) is
Image signals processed with the same threshold as in (16-3) are extracted.
4 blocks by putting out and rearranging in block order
In between, as shown in (16-4) EVDO, two state changes
Becomes That is, as shown in (16-3), the same
Signals with the same threshold have little variation between black and white states
So, by arranging these in a row,
Will be extended.   In this embodiment, the dither matrix of the image signal is used.
Double using the dither counter 10-10
Lines are controlled by controlling the reading of buffer memories 10-15.
U.   The dither image signal RVDA from the reader is
Double buffer by address control of data decoder 10-12
Are written in the memory 10-15 in the order of input from the reader.   In this embodiment, the repetition of the main scanning of the dither pattern is 8
Because of the bit interval, the dither counter 10-10
When reading image data from the
Count down and read out at intervals. This 8 bits
The reading of the interval is performed by the controller 10- shown in FIG.
2 by the Dither signal. Also control
Error 10-2 is the number N of main scanning compression blocks shown in (16-1).
Is the value obtained by subtracting N-1 from the counter setting value of 13-2.
Is set in the comparator 13-3. The number of compression blocks
N is the main scanning compression data length given to the compression circuit 10-4.
It corresponds to the length of the H-AREA signal shown (H-AREA signal
(Bit length) = N × 8.   When the Dither signal in Fig. 11 becomes H level, 3 bits
The counter 13-1 and the 10-bit counter 13-2 are separated,
13-2 counter counts down and the comparator 13
When counting by the number of blocks N set to -3,
A = B output of the comparator 13-3 is generated, and the counter 13-
2 is reloaded to the first set value and the counter of 13-1 is
Count down by one.   That is, the number of blocks N is counted by the counter 13-2.
Then, the counter 13-1 sets the threshold value in what block in each block.
Specify the image signal. In this way,
The main scan block length of the box is determined by the comparator 13-3.
Any N can be selected and any in the main scanning direction
Can support dither compression of image signals of length
You. (3) Binary image decompression function   The binary compressed image described in (1) is decompressed and processed.
This is a function to output to the linter 10-3.
The image can be trimmed and moved.   First, to explain basic binary image decompression,
In the case where each of the processing of
The compressed image signal from the area B in FIG.
The compressed image is assumed to be stored in the memory 10-5.
In the location of area B of A3 output paper of size A area
Take output as an example.   Controller 10-2 precedes image decompression output for B area
Printer to create a margin of 100 mm in the sub-scanning direction.
The sheet 10-3 is made to feed A3 output paper in advance. That is,
In FIG. 4, the printer moves from the transfer position b of the photosensitive drum.
Distance from laser exposure to point a and resist from b
It is configured so that the distance to the paper feed point c is equal
A4 output paper is sent out by the 4-7 registration roller
Then, after the sub-scanning paper feed of 100 mm, the extension operation starts,
The B image in FIG. 13 is output. Therefore, the controller
10-2 outputs the resist feed signal VSYNC to the printer
After that, the line counter 10-11 counts the number of lines equivalent to 100 mm
Set. This value is 1574 lines at 400 dpi resolution.
Become.   The line synchronization signal LN-ST at the time of image expansion is SEL3,1 of 10-20.
The BD signal P-BD from the printer is selected by SEL5 of 0-22.
Selected. Also the internal clock φ_SYSIs in SEL5 of 10−22.
Internal clock generator 10 in synchronization with the selected HSYNC
The I-CLK generated at -16 is selected by SEL1 at 10-18.   By the way, the sub-scan margin 100m is obtained by the line counter 10-11 described above.
When counting of 1574 lines equivalent to m
The controller outputs the image expansion signal V-DEC and expands the B area.
The operation starts, but before that, when the image is compressed and stored,
The address value set in the memory address counter 10-8 is
The final MADR value at the time of compression is set in comparator 10-14.
I do.   Decompression circuit 10 by VDEC signal from controller 10-2
-6 expands the image line by line and expands the image signal
DVDO is written to double buffer memory 10-15, and
After the input, it is output to the printer. At this time
The data in the buffer 10-10 is written to the double buffer memory 10-15.
Only works as an address counter and decodes the main scan counter.
The data acts as a read address counter.   Hereinafter, the one-line image decompression operation will be described with reference to FIG.
You. Video enable for printer when HADR value is A
It is assumed that the OVE signal as the
The down counter of the main scanning counter decoder 10-11
14-1 shows the value LMG (1
A + LMG taking into account 73 bits) and comparator 14-2
Set A. The comparator 14-3 has A-4679,
A for comparator 14-4, A-22 for comparator 14-5
03, B for comparator 14-6, B for comparator 14-7
B-2203, dither cow when counter 14-1 reaches A
So that the counters 13-1 and 13-2 start operating.
Is set to A. Also, dither counters 13-1, 13-2
Is low so that it performs the same counting operation as counter 14-1.
A is set as the code value.   When the PBD signal is input from the printer 10-3, the LN-ST signal
Signal occurs, and the HADR of the main scanning counter decoder 10-12 becomes F
Counts down from + LMG and counts the clock to LMG
And, when HADR becomes A, OVE signal, HAREA signal, DCSTART signal
Occurs. This LMG is exposed from the BD sensor of the printer.
Number of clocks equivalent to the main scanning length up to the image effective part of the ram
And the OVE signal is output to the printer during the H level section.
The printed image signal is printed on output paper.   70mm from HADR to A to area B in Fig. 13
HADR is counted by counting 1102 clocks corresponding to the margin of
Is reached, the TRM signal goes high and the double buffer
The output image signal from the memory is enabled by gate 10-27.
If the HADR becomes B-2203, the printer
2204 pixels corresponding to the main scanning width of 140 mm are output, and T
When the RM signal goes to L level,
The image signal is nullified by gate 10-27. Like this
The decompressed image signal stored in the buffer memory is
Output to the double buffer memory 10-15.
The writing of the long image DVDO is as follows.   Decompression circuit 10-6 and EOL detection circuit 10 simultaneously with the rise of OVE
The H-AREA signal applied to -7 goes high and the
Decompression of the compressed image MR code by the path 10-6 is started.
The expansion circuit 10-6 includes a sub-scanning expansion section signal V-DEC and a main scanning expansion signal.
The section compressed image memory 10 in which the long section signal H-AREA is at the H level.
Read the compressed image MR code from -5 and do not show the code.
Into the decoding counter_SYSClock
To count down to generate a decompressed image DVDO. Sand
The T code 2H of the MR code is fetched as shown in Fig. 17.
φ_SYSOutput DVDO of 2 clocks white signal. φ_SYS2 black
The decode counter counts up due to the
Generates a reduced image request signal DRP1 and sends it to the compressed image memory 10-5.
The next MR code is read, and the output of DVDO is inverted.   Next MR code is 91H and M code
φ_SYSClock counts 2176 clocks to generate DRP1
You. However, since the M code and T code are a pair,
DVDO is not inverted and the next T code 15H
Invert DVDO by step. Thus, HAREA is H
The image is expanded in the level section and the dither counter 10−
Expanded to double buffer memory 10-15 by DADR from 10
A long image DVDO is written. And this DVDO signal is
Is read from the HADR address point B in the line
As described above, B is set as the count start value of the dither counter.
It is. In addition, the dither counter in FIG.
The L level is set for the Dither signal.   The length of the HAREA signal at the time of image expansion is
The same clock number as H-AREA used at the time is output.
In addition, comparators 14-4 and 14-5 are set.
When the REA signal falls, the current line is successfully expanded,
The failure is determined by the EOL detection circuit 10-7.   The success of the decompression operation is determined by the fall of the HAREA signal,
The next MR code is EOL and the decompression circuit 1
The 0-6 decode counter counts up and the DPR1 signal
The three states that the signal has occurred are complete
Do with. This is a compressed image of the MW code signal from the compression circuit
When writing to memory 10-5 or compressing MR code
Code may contain errors when read from memory
If there is an error in the MR code,
The end of the accurate section signal HAREA and the extension of one code
Generation of DPR1 pulse which is the end of operation and line end code
EOL will not match. Here are the three states
Match, and there is no decompression error.
The output circuit 10-7 outputs the first line of the next line for the next line.
Generate DPR2 to read MR code.   Below, the operation in line units when a decompression error occurs
Will be described with reference to FIG.   In FIG. 18, the line input from the printer 10-3
Main scan address counter decode 1 by synchronization signal PBD
From 0-12, the main scanning extension section signal is generated regardless of V-DEC.
Alive. Sub-scanning extension section from controller 10-2
When the signal V-DEC is at L level, the signal DECE from the EOL detection circuit
NB signal and Buff CHG ENB signal are H level and double cross
The Buff CHG signal for switching the memory is always generated.
You. At this time, the Data ENB signal is at L level and the printer
Image signal RMU-VD output to AND gate 10-28
Fixed to L level.   The controller 10-2 transmits a V-DEC signal to perform image decompression.
Signal to the H level, and the following HAREA 1, HAREA 2,… HAREA 9
, An image decompression operation is performed in line units. Image expansion
Sometimes the HAREA area is divided into three states. That is,
The state of x for normal decompression operation and the occurrence of decompression error
And the DEENB from the EOL detection circuit is L level
This is the extension error recovery state z.   The next line HAREA1 where the V-DEC signal goes to H level
The image expansion is started in the expansion circuit 10-6. 18th
As shown in the figure, an expansion error occurs in the first HAREA1 (y
State), the EOL detection circuit 10-7 outputs Buf at the rear end of HAREA1.
f Set the CHG ENB signal and DECENB signal to L level, and
In-HAREA2 switches and expands double buffer memory
The decompression operation of the circuit 10-6 is stopped, and the decompression error recovery is performed.
EOL detection processing is performed (state z).   The EOL detection circuit 10-7 uses HAR as extension error recovery.
Until EA detects EOL code FFH as the section MR code of H
Repeatedly generates a DRP2 signal. Detect EOL code
Synchronization between compressed image data and HAREA signal
Has recovered and the next HAREA3
Read the first MR code and return DECENB to H level
Then, the decompression error recovery operation ends.   When the image expansion operation is completed normally in the next HAREA3
(State of x), the EOL detection circuit is the first MR
One clock of DPR2 is generated to read the
 Set the CHG ENB signal to H level, and then input
Set Data ENB to H level by LNST signal   The image decompression operation is correct for both HAREA4 and HAREA5 lines.
The Buff CHG ENB signal remains at H level
Decompression errors occur in HAREA6 as in HAREA1.
Alive. In this state, the EOL detection circuit switches to HAREA6.
Is written to the memory Y of the double buffer memory.
Also, decompressed image data containing decompression errors is output to the printer.
Set the Buff CHG ENB signal at the rear end of HAREA6 so that it is not
Level, and then succeed in image expansion in HAREA8.
Disables double buffer memory switching. others
In the section where the error was recovered in HAREA7 and in HAREA8,
The section where the next decompression operation is being performed is decompressed in HAREA5
The image data of successful expansion is repeatedly sent to the printer by the RMU-V
Output as D signal.   In this way, a decompression error occurs due to the Buff CHG ENB signal.
Buff by LNST after line and error recovery line
 Since the CHG signal does not occur, it is shown in the RMU-VD signal in FIG.
As shown in FIG.
Data is output to the printer 10-3 as an RMU-VD signal.
It is.   Also, the Data ENB signal has a successful expansion line as described above.
This is a signal that goes high for the first time after it occurs.
Signal until the V-DEC signal goes high,
Uncompressed image containing errors until the line is generated
Data will not be output to the printer.   In addition, the Data ENB signal is used when the V-DEC signal goes low.
Is configured to go to L level one line later
And the expanded image in the last HAREA9 line
Output to the printer.   The controller 10-2 is provided with a decompression error counter 10-35.
LN generated while the Buff CHG ENB signal was at L level
The line where the expansion error has occurred by counting the ST signal
And the total number of lines that performed error recovery
You. That is, this count value is the
The controller 10-2 has successfully expanded.
If the number of missing lines exceeds eight, the extension error
-Immediately set the VDEC signal to L level
Processing such as stopping the long operation is performed. As a result, the extension error
Detection without waiting for the expansion of the image for one page.
This allows for quick processing of decompression errors.
You.   Sub-scanning expansion output by controller 10-2 during expansion
The long-term signal V-DEC output the V-ENC signal during compression
Count the same number of lines in line counter 10-11
And output.   Therefore, a decompression error must occur during image decompression.
For example, if the controller 10-2 starts from the line counter 10-11
Receiving the predetermined sub-scan line count completion output of
At the timing of returning to the level, the memory address counter 10
The address output M-ADR from -8 compresses the decompressed image.
The value of the final M-ADR when   The comparator 10-14 stores the final M-ADR value at the time of compression.
Controller 10-2 will set the VDEC signal
At the time of L level, M_OVERShould detect the signal.
You.   By the way, during the expansion operation, an expansion error occurs as described above.
When it is generated, the EOL detection circuit 10
-7 skips reading MR code to find EOL code
Because M_OVERWhen a signal occurs, the line counter 10
At -11, the count remains. This count remaining
To count all, keep sending V-DEC signal
Also M_OVERMemory address count for signal
Since data 10-8 stops counting, the memory address
Address of the count value when the counter 10-8 stopped
Image data is repeatedly taken into the decompression circuit 10-6.
And all the remaining lines become expansion error lines.
I will.   Therefore, in order to prevent this state,
2 sets the line counter 10-11 by setting the VDEC signal to the H level.
While waiting for a count-up from the M_OVERSet signal
Periodically, when V-DEC is at H level, M_OVERDetect
Then, immediately set the V-DEC signal to L level and expand the image.
Stop operation and count extra decompression error lines
Not to do.   Thus, when the memory address counter is
Stops the image decompression operation when the maximum address matches
As a result, an unintended extra image signal is
3 can also be prevented from being recorded.   Next, a portion of the expanded image signal is trimmed and output.
The case of outputting to an arbitrary portion of a force sheet will be described.   FIG. 19 shows the main scanning from the point S1 of the A4 size expanded image U.
H in direction₁Bit, V in sub-scan direction₁Line point t₁The reference point
As main scanning size H_TwoBit, sub-scan size V_TwoBit of
Trim the image in the T area and copy it to A4 copy paper.
V₁, H₁This is an example of outputting without changing the position of.   As described above, one line decompression operation is performed by PB from the printer.
Start with LN-ST signal by D signal as synchronization signal
However, in FIG. 19, the main scanning address counter / decoder 10
One line extension from the point where HADR from -12 reaches 4677
Long operation begins. That is, HADR is 4677 and H-AREA is H
Set 4677 to comparator 14-4 so that it becomes bell
I do. Also, to end the extension at 4677 A4 width,
Set 0 to the comparator 14-5, and set the length of HAREA
Is 4677 bits. Also expanded by the expansion circuit 10-6
The expanded image signal DVDO is transferred to the double buffer memory 10-15.
So that DADR writing to and HADR reading out operate the same
Comparator that creates the timing of the DC START signal
Set 4677 to 8 and count the dither counter 10-10.
The LD values of data 13-1 and 13-2 are also set to 4677. This
The image signal compressed as described above is decompressed
It is.   Controller 10-2 is a printer as shown in FIG.
Send A4 copy paper registration paper feed signal PVSYNC to 10-3
At the same time, a sub-scanning extension section signal V-DEC is output. this
Starts image expansion and output at the same time as the printer feeds paper.
If trimming is not necessary here, V-
To output DEC over the same time span as PVSYNC
As a result, all of the expanded image U of A4
Will be output. Perform the trimming as described above here
In order to make the controller 10-2₁Turn off line image signal
Output the V-DEC signal,₁Of the line
During this time, the TRM signal is fixed at L level,
The image signal read from the memory is fixed at L level by the gate 10-27.
Set. For this, V₁TRM signal counting line
1FFFH, comparator 14-6
By setting 4677 (1245H) to 14-7,
Lip flops 14-12 only require a reset
To do.   V₁Line count is counted by line counter 10-11
T₁From sub-scanning width V_TwoLine, main scanning width
H_TwoThe bit T region is trimmed. For that,
V to in counter 10-11_TwoSet the line and_TwoLa
And the main scan trimming area between
H from the point t of the area_TwoGenerate TRM signal indicating bit width
Therefore, the comparator 14-6 (4677-H₁) And set
The comparator 14-7 has (4677- (H₁+ H_Two)) Set
I do. As a result, the TRM (V_TwoGet)   With the above constant set, t₁V from point_TwoBetween the lines
Of the T region is realized. Image signal of T region
Is output to the printer, the line counter 10
−11 to controller 10-2, V_TwoEnd of line count
Is output. At this point, the compressed image memory 10-5
Contains the compressed image code of the shaded portion in FIG.
Image output of the desired T area that remains without being read
Has already been completed, so controller 10-2
There is no need to expand the compressed image code in the shaded area
The EC signal is set to the L level here to stop the decompression operation.
Since the VDEC signal has changed to L level, the DOL signal from the EOL detection circuit
ata ENB signal becomes L level and V_RThe line is
The image signal becomes a white signal (L level) to the printer,
The trimming output of the area is completed. Thus, extra pressure
By not expanding the contracted image code,
Reduces the amount of errors that occur, resulting in errors in decompressed images
Incidence of misprints due to inclusion
Thus, the reliability of the copy operation is improved.   Next, the T region trimmed in FIG.
H from the edge of the paper in the main scanning direction_ThreeMove to the pixel position and
The case of outputting to the linter 10-3 will be described with reference to FIG.   In this case, write the expanded image to the double buffer memory.
Move the expanded image of one line when
When reading the moved image from the memory,
Crop the area image. Moving and expanding the expanded image
All rimming is performed based on HADR. That is,
In FIG. 21 (a), the HADR (4677-H₁) To HADR (4678)
− (H₁+ H_Two)) Expanded by the expansion circuit 10-6 in the address range
The image of the T area is displayed in a double buffer memo by DADR.
In FIG. 21 (b), the double buffer
H when read from memory by HADR_Three−H₁Bit
Has been moved and HADR (4677-H_Three) To HADR (4678-
(H_Two+ H_Three)). This picture
The image movement is executed by the address control of the DADR.
In (a), the image of the T area of the decompressed image is stored in the double buffer memory.
When the image is written (HADR is 4677-H₁At the time of)
Pixel, H_Three−H₁4677-H moved only_ThreeDADR at the address of
Just write it in. That is, it is clear from FIG.
As shown in the figure, the starting value of DADR count at HADR = 4677
Number of scanning movement bits H_Three−H₁4677- (H_Three−H₁)
I just need. This H_ThreeIs the main scanning reference point (HADR
= 4677), it becomes a positive value, and approaches the opposite
In this case, it becomes a negative value.   The image signal read from the double buffer memory is
Trimming is performed by the TRM signal.
21 As shown in FIG._Three−H₁Considering that, HADR
4677-H_ThreeFrom 4678- (H_Two+ H_ThreeBetween H)
Thus, the comparator 14-6 has 4677-H_ThreeSet
4677- (H_Two+ H_Three) Is set.   Next, the expanded image signal is output in the sub-scanning direction on the output paper.
The case of moving in the (paper feed direction) will be described with reference to FIG.   The portion of the T region in the expanded image U as shown in FIG.
To the desired position in the sub-scanning direction on the output paper.
How to trim the T area
Also, since the movement of the image in the main scanning direction has been described above, here,
Shows the timing of register paper feeding of copy paper,
The timing in the sub-scanning direction of the start of expansion of the image U is described.
Bell.   FIG. 22 (b) shows the copy paper sub-scanning direction (paper feeding method).
The extended image U to the rear of
From the end of the paper_ThreeAt the line, cropped image
T₁This is an example of recording a point.   The difference between the copy paper and the expanded image U in the sub-scanning direction is V_Two
−V₁Because it is a line, the controller 10-2
Register paper feed signal P-
After outputting VSYNC, the line counter 10-11 outputs VSYNC._Three−V₁La
After counting in, the sub-scanning extension section signal VDEC becomes H level.
Then, the expansion operation of the expansion image U is started. Here the TRM signal
To output an image in the T region with the signal, the V-DEC signal is
Bell and then V₁It is when the line has passed. So
And V for the sub-scan in the T region_TwoLine by line counter
After counting, the V-DEC signal is set to L level and expanded.
End the operation.   Fig. 22 (c) shows the state before copy paper is fed
Expands the expanded image U and V_ThreeAt the line,
Cropped image t₁Here is an example of outputting a point, t₁Point is copy
-V if on paper_ThreeIs a positive value, goes out of copy paper
In this case, it takes a negative value.   In FIG. 22 (c), the resist feed signal to the printer is
V before outputting the signal PVSYNC₁−V_ThreeBefore line image expansion
You need to keep it. So controller 10
-2 is a line counter 10-11, V₁−V_ThreeLine drawing
Once the image is expanded, the VDEC signal is set to L level
Interrupt the decompression operation and wait for the PVSYNC output timing.
One. V-DEC signal again at the timing of PVSYNC output
H level and continue the suspended image decompression operation.
Let V₁−V_ThreeThe image of the line is moved.   The trimming of the T region is as described above.₁
Point is V from paper edge_ThreeIf the line protrudes, put it on copy paper
The output T region is reduced accordingly. Output PVSYNC signal
Before powering, V₁−V_ThreeThe image of the line is expanded, and once V-
The DEC signal is returned to L level.
Consider using RVSYNC from the reader.
That is, the image expanded by the RMU and the image from the reader
Output to a printer with overlay
To accurately match the overlay position of the image, a common
The VSYNC signal must be used. However, from the RMU
Since there is no way for the
Must use VSYNC from reader (RVSYNC)
No. About controller 10-2 asynchronous with reader
Will take detailed timing of when RVSYNC is input.
It is difficult to do. So the controller 10-2
Enough before inputting VSYNC (RVSYNC) from the reader
And V₁−V_ThreeAfter the line image is decompressed and printed on copy paper
The MR code of the decompressed decompressed image is retrieved from the compressed image memory.
And then start the decompression operation again in accordance with RVSYNC.
There must be. That is, while waiting for RVSYNC, V
Since the decompression operation is suspended by setting -DEC to L level,
is there.   When the overlay operation is not performed, the reader C
There is no need to synchronize, and the output control of the PVSYNC signal is controlled by V-DE
Performed by line counter 10-11 in the same way as C signal output control
You can also. Therefore, once the VDEC signal drops to L level
Output the PVSYNC immediately, without interrupting the decompression operation.
Can be executed. (4) Dither image expansion function   Decompression processing of the compressed image by dither compression of (2)
The dither counter at the time of dither compression
The main scan image by
When expanded, the copy output differs from the original image.
I will. Therefore, in the dither image expansion processing, the binary expansion of (3) is performed.
Obtained from decompression circuit 10-6 by the same process as long processing
The expanded image signal DVDO replaced with
When writing to Blvd Memory 10-15, the original memory
And rearrange them in the order of the dither images.   This rearrangement will expand the double buffer memory 10-15
Change the order in which the write address counter DADR
And is realized by   That is, the image rearranged as shown in 16-3 in FIG.
The images are arranged at 8-bit intervals so that they are in the order of (16-2)
This is the dither counter shown in Fig. 11.
The Dither signal of H level to
The counters 13-1 and 13-2 are operated.   In this case, the counters 13-1 and 13-2 have the controller 10-
The counter load value set by 2 depends on the movement of the decompressed image.
Any value can be set as in the case of the binary image decompression processing
However, the load value of the counter 13-1 is used for dither compression.
It must be the same as the value that was used. If I do not,
The image signal read from the double buffer memory
The arrangement of pixels in one block of the pattern will be out of order.
You. Also, the comparator 13-3 has a
Using the number N of blocks used, the row of the counter 13-2 is
The value obtained by subtracting (N-1) from the code value is set.   The reader / RM in the configuration of this system described above
Serial communication between U and RMU / printer and image processing
The detailed procedure of the work will be described below. For the following explanation
The program shown in the flowchart
Microcomputer that constitutes the control unit of the linter and RMU
Is stored in advance in the memory ROM of the
Thus, the control operation is performed.   The serial communication shown in FIG._EVICE Conne
ct, D_EVICE P_OWER Ready, Controller Power Ready signal
As a result, all units including the RMU can communicate serially.
The printer unit from the reader unit
Output instructions (hereinafter referred to as commands) to (including RMU)
It is started by doing. Command arrived at printer
The printer responds to the command (status
Is output to the reader unit (including RMU).
You. The RMU basically input commands from the reader.
Output the same command to the printer,
If status is entered, same status to reader
Output.   Serial between reader unit and printer unit
Communication is 8-bit command and status exchange
In this case, one command
Status is returned, and the status is
It will not be returned in advance.   FIG. 23 shows the processing for an RMU command.   The RMU inputs commands from the reader. This command
Are the RMU mode instruction codes 100-7 to 100-14 in Table 1 below.
Command, RMU memory instruction command, RMU trimming instruction 1 command
Command, RMU trimming instruction 2 command, RMU trimming finger
3 command, RMU trimming instruction 4 command, RMU trimming
Command 5 command, RMU trimming command 6 command (this
These eight commands are collectively called an RMU instruction command. )
(S-100-1), respectively
Table 10 Overall Status of One Command Byte
Is returned to the reader (S-100-5). RMU is the input
If the command is not one of the RMU instruction commands,
Is the printer start command shown in Table 100-1?
Is determined (S-100-2). Printer start frame
If the RMU is connected to the system,
After the instruction command is output from the reader,
Therefore, at this point, the RMU mode described later has already been determined.
You. If this RMU mode is the “input mode” described later,
In this case, the printer does not perform a copy operation,
RMU does not output the printer start command to the printer
The overall status of Table 10 to the user (S-100-
3, S-100-5). A command containing information necessary for the operation of the RMU
Command, such as a paper size command,
Memorize and then output to the printer (S-100-
4).   Next, use Figure 24 to process RMU status
Will be described. Printer output from reader from RMU
When a command is entered, the command entered within a certain time
Output status to RMU for   The RMU enters this status when it enters status from the printer.
Determine which command the status is for, and
Application status request command of Table 108-7
Application status in Table 15 for the
It is checked whether or not it is (S-101-1). I input it
If the status is application status
Sends the information to the reader after adding the RMU connection information (S-101-2)
Output as application status.   Similarly, the status from the printer is
-Judge whether it is the generated unit status
(S-101-3), a compression failure flag described later is set.
Compression failure information (RMU memory overflow
-) The error occurrence unit status added with-) is read.
And if the compression failure flag is reset
The error occurrence unit status from the printer is
Return it to the leader. The status from the printer is 10th
The overall status of the table or the details of the misprint in Table 16
It is determined whether the status is status (S-101-6, S-10
1-9), if the decompression error flag is set
Information on the decompression error
Attached to the lint detailed status (S-101-1, S-101-1)
1) If the decompression error flag is reset
Overall status or misprint details from printer
Return status to reader as is.   The RMU receives commands from the reader and responds to the printer
To the command or to the overall status to the reader
Return the printer and respond to the status input from the printer.
Transfer status to reader or add information to status
After processing, transferring is repeated alternately.   In a system with an RMU connected in this way, the RMU
Import only necessary information, pass through other information
Communication is performed. This allows the exchange of information
The reader will reduce the time required for communication and monitor communications,
Communication protocol can be simplified.   Hereinafter, between the reader, RMU and printer shown in Fig. 23 and Fig. 24
Command or status used for serial communication in
Will be described in detail.   Table 1 shows the execution commands that prompt the RMU or printer to execute.
Command. This execution command is output from the reader
If the RMU or printer is
Return status. 100-1 in Table 1 is copied to the printer.
-Printer status command to supply operation start, 1
00-2 is a printer that requests the printer to stop the copying operation
Stop commands 100-3 and 100-4 specify the paper cassette
The paper feed instruction command 100-5 to specify the paper size
In the size indication command, the second byte (the
Table 2) shows A4, A3, B4, B5,
Paper sizes such as A4-R and B5-R are coded and stored.
100-6 is a number instruction command.
Use 6 bits from bit 1 to bit 6
You can set up to 64 copies. 100-7 is RMU finger
RMU mode command, which is one of the
The RMU mode information is stored in each item as shown in Table 5.
You. 100-8 is an RMU memory that indicates the memory area of the RMU
Memory specified in the second byte (Table 6) by the command
Stores the contents of the area and displays the corresponding memory area
Only the reset is set (“1”). 100−9,100−10,100−
11,100-12,100-13,100-14 are RMU trimming command frames
In the second byte (Table 7) and the third byte (Table 8).
Adjust the rim amount from 0 mm to 512 mm in millimeters.
Can be expressed by   Table 9 shows the status for requesting RMU or printer information.
Indicates a status request command. This command is received by the printer.
If you receive it, the status shown in Table 10 to Table 16 is RMU
To the reader through. At this time, the RMU is
Adds overflow and decompression error information and returns to reader
May be sent.   Hereinafter, Tables 10 to 16 will be described in order. Table 10
Is the overall status, mainly the rough status of the printer and RMU
Stores information about Bit 5 is the printer
Set ("1") if paper is being conveyed. Bits as well
4 is for misprints, bit 3 is for weight
Medium, bit 1 is operator call error, serviceman
Set each time a call error occurs. No.
11 The error occurrence unit status in the table
Stores information on whether an error has occurred and
Call error status, service call error in Table 13.
Error status is information about the specific content of the error, as well as
The cassette paper size status in Table 14 is A4, B5, B4, etc.
Information, the application status in Table 15 is
Information on what units are connected to the stem
The misprint details in Table 16 are misprinted.
Information about the client.   The leader collects these statuses to create a system.
You can know the cause of the system error
It makes system management easier.   Copy sequence by command and status described above
The serial communication is not in progress.
This will be described with reference to FIG.   The reader is the application stay 108-8 in Table 9.
Table 15 Application by Output of Status Request Command
Obtain RMU connection information by status (S-120-
1). Also, the lower cassette paper size requirement of 108-5 in Table 9
Command, request for upper cassette paper size of 108-6 in Table 9
Table 14 Cassette paper size status by command output
To obtain information on the paper size of the upper and lower cassettes of the printer.
(S-102-2). After this, the overall schedule of 108-1 in Table 9 is
Status request command 108-2 in Table 9
Table 10 whole by nit status request command output
Status, Table 11 Error occurrence unit status
Information on whether there is an error in the printer or RMU
(S-102-3, S-102-4). There is an error after this
A check is made as to whether or not (S-102-5). At this time
If there is an error, ninth to get more information
Operator call error status request of Table 108-3
Command, service call error of 108-4 in Table 9
Outputs status request command and outputs status
The detailed information of the error is obtained by the input (S-102-6, S-
102-7), necessary information such as no paper, RMU memory overflow
The operator can be notified that there is a row.
If there is no error, press the copy start key.
Check if it was done (S-102-8) and press
In this case, serial communication during copying (Table 17) is performed.
Copy key if copy start key is not pressed
The operation described above is repeated until is pressed.   Serial communication during copy operation, operation of each unit, communication
No. will be described with reference to Table 17.   Paper size selection (A-) at the reader, number of copies
Setting (A-), Image reading mode (A-), RMU mode
RMU usage conditions such as data, trimming data, and RMU memory instructions
(A-) is input from the operation unit of the reader by the operator
When the copy key is pressed (A-), the reader
RMU instruction command (RMU mode instruction
Command, RMU memory instruction command RMU trimming instruction command
Command (B-). RMU is RMU instruction command
Input the selector 1, selector 2, selector 3,
Selector 4, selector 5, video selector, etc.
Perform (C-). The reader follows the RMU instruction command,
The number instruction command (B-), the upper / lower sheet feeding command (B-
), And outputs a paper size instruction command (B-). RM
U inputs the paper size instruction command (C-) and the tenth
Figure Setting of comparator, dither counter, main scanning counter, etc.
(C-). RMU mode is “Memory Input
Mode ”to the printer.
The printer can output paper because the RMU is not flowing
Since a signal (hereinafter abbreviated as PREQ) is not output to the RMU,
The MU outputs PREQ to the reader instead of the printer (B-
). RMU use mode is not memory input mode
When the printer start command arrives at the printer,
The printer sends PREQ to RMU when it is ready to feed paper.
(D-), and the RMU outputs PREQ to the reader.
(B-). Reader from RMU (from printer)
When a PREQ is input, the output paper feed signal (hereinafter PR
(Abbreviated as INT) is output to the RMU. (B-).   When the RMU mode is "Memory Input Mode"
Does not output PRINT to the printer (D-)
The printer inputs PRINT and receives an image request signal (hereinafter V
RMU sends VSREQ to the reader as if
And output (B-). Reader sends VSREQ from RMU
VSYNC is output (B-
). Reader requests overall status during copy operation
Command and error occurrence unit request command for a fixed time
Is output every time, error check and RMU memory over
-The flow and the like are constantly checked (B-). Several tubes
Because the reader is running, the printer
RMU resets the mode when the
(C-) Perform and copy is completed.   4 RMUs by RMU instruction command from reader 10-2
Image input / output mode.   The first is a mode called “memory path mode”.
RMU represents the three values input from reader 10-1.
The book image signals RVDA and RVDB are output to the printer 10-3 as they are.
And the reader 10-1 and printer 10-3 are directly connected.
Behave as if it were. Therefore in this mode RM
U from reader 10-1 through video interface
The input signal is output to the printer 10-3 as it is,
The signal input from the linter 10-3 is used as it is for the reader 10-
Output to 1.   The second is a mode called “Memory High Speed Mode”
The RMU receives the image signal RVDA from the reader 10-1.
One day, it is compressed and stored in the compressed image memory, and then
The compressed image data is read and output to a printer.   That is, a reader 10-1 requiring a mechanical reciprocating motion.
Only one copy of the manuscript scan is required.
Copy of the RMU without mechanical reciprocation
Repeat the compressed image data stored in the reduced image memory
Large copy because it is obtained by decompressing and outputting to printer 10-3.
High-speed processing.   The third is a mode called “Memory Input Mode”.
RMU without operating the printer 10-3.
Compresses the image signal input from the reader 10-1,
It is stored in the compressed image memory.   The fourth is a mode called “Memory Overlay Mode”.
RMU is the compression mode stored in the compressed image memory.
At the same time as the decompressed image data is expanded,
The image signal is synthesized with the image signal to be output to the printer 10-2.   With this function, the original scanned by the reader 10-1 and the RMU
Of the images stored in the memory
Copies are obtained.   “Memory high-speed mode” has three modes inside the RMU.
Mode “Retention mode”, “Output mode”,
A distinction is made between “through-out modes”. “Retention
"Mode" is the first page of "Memory High Speed"
To the printer while compressing the image information (signal) of the
It is a thing that does nothing. Reality of “Retention Mode”
Successful or unsuccessful compression into memory depending on the row (RMU memory
Overflow) can be determined. Reader is copying
Error occurrence unit request command causes memory pressure
Compression success / failure information (RMU memory overflow)
And if compression to memory is successful, the next
From the copy (from the second copy) to the expanded image from memory
The reader scans the original because the image can be formed (copied).
Stop. RMU can expand memory from next copy
Reset of the selector as described above. For example, the video in Figure 10.
The selector 10-23 prints the decompressed image from the memory of the RMU.
Reset to output to the data. Thus, the selector
The reset mode is called "output mode".
Conversely, if compression to memory fails, the "Retention"
In the “Mode” mode, image compression
Do not compress to memory as it will pass through
Operation is required. Set this mode to the through-out mode.
The “through-out mode” is the “memory path mode”.
And the RMU selector settings are the same, but the leader
In the former, the values of threshold generators A and B are the same.
VDA, VDB independent
Since it is a ternary image, the name was changed. This RMU internal mode
Due to the change in the mode, the RMU has a
Binary image regardless of success or failure of image compression to moly
And eliminate the difference between the first and second and subsequent images
Becomes possible. Table 18 shows the relationship between RMU mode and RMU internal mode.
I will show you the response.   The reader operation will be described with reference to the flowchart of FIG.
You.   First, when the copy key is pressed by the operator,
Command to the RMU and the printer (S-103
-1), number command (S-103-2), top and bottom feeding
Command (S-103-3), paper size instruction command (S
-103-4), Printer start command (S-103-
4) is output, and the initial settings necessary for the copy operation are performed.
After inputting the PREQ from the RMU (S-103-10), the
NT is output to the RMU (S-103-11). In addition, a timer
Start (S-103-12) and wait until this timer expires.
Wait for a certain period of time (S-103-13), RMU internal mode
Start the optical system in “Output mode”.
Without counting (S-103-14), count down the number of sheets
Check whether the number is 0 (S-103-20).
Outputs a printer stop command (S-103-2)
1). RMU internal mode is other than “output mode”
When scanning, the optical system is scanned (S-103-1).
5), scanning of the original is started and the (S-103-16) image is
Output to RMU. After checking the end of reading
(S-103-17) In case of memory input mode
Does not check the number of sheets.
No.) Printer stop command to RMU
Output (S-103-21). “Memory Input Mode
For other than “Output mode” and “Output mode”,
Down (S-103-19) when the number is 0
Outputs a printer stop command.
Is in the state where the PREQ input is held, and the above operation is performed until the number of sheets reaches 0.
repeat.   The operation of the printer will be described with reference to the flowchart of FIG.
You.   The printer starts from the reader side (including the RMU).
(S-104-1) Drum charging
The operation of each part such as is started (S-104-2). Printer
If paper can be fed (S-104-3), the
PREQ is output to the reader (S-104-4).
If PRINT is input in response to REQ (S-104-
5), paper feeding (S-104-6) is performed. Feed paper and receive image
When communication is possible (S-104-7), VSREQ is output to the reader
(S-104-8). VSYNC reader corresponding to VSREQ
And outputs an image signal (S-104-9). Pudding
Performs copy processing (S-104-10) and there is an error
Check if it is (S-104-11), and if there is an error
If the error is detected, the error is put on the serial communication (S-104
-12). When the above operation is repeated for the number of copies, the reader
Printer stop is received because printer stop is output.
(S-104-13) The printer receives this
Then, each part of the printer is stopped (S-104-14).   Before explaining the operation of the RMU,
The dress management will be described with reference to FIG. RMU
When storing compressed image information in memory
Address of the compressed image to be written (MS and
(Abbreviated below) and the maximum write address of the compressed image (ME and below)
Abbreviated) can be set. The RMU uses compressed images according to the MS and ME settings.
You can determine the success or failure of writing the image
It is also possible to protect the embedded image information.   Since the memory is limited, the maximum value is set to MLMT. No.
Fig. 28 (1) shows that no image is written to the RMU.
It shows a bad state. At this time, set MS ← 0, ME ← MLMT
Keep it. This indicates the largest empty area of the memory.
It will also be. The RMU memory instruction command causes
Memory A is selected and A4 in dither memory high speed mode
When a copy of the size is made, the RMU returns
The image stored in memory A is compressed in any mode of RMU
Information (MA-VIDEO) indicating whether the compressed image
(MA-PSZ), reader reading mode (MA-METHO
D), the image writing start address (MA
S), the image write end address (MAE) of memory A
Remember. These information are written to memory B and memory C.
The same operation is performed when the image is written.
If not, write the corresponding information.
Shall be included.   In the state of (2), writing to the memories B and C
The performed state is (3). Memory B in the state of (2)
Or, when writing to memory C is instructed,
The area in the state of (2), which is the area, is expressed as MS ← MAE + 1, ME ← MLMT
Set as When memory A is specified again
From the area including the upper and lower empty areas of the memory A to the new MS ← 0, ME
← Set as MLMT. By setting like this
Same as when memory A is specified in state (1)
In the state of (3) where the memory can be used effectively
When the memory A is designated, in the state of (3), the memory A
There is no continuous empty area, and the memory amount of the memory A and (3)
Compare the amount of memory in the empty area in the state of
The larger one is set as a new memory A area. (3) condition
In the state, the empty area is larger, so MS ← MBE + 1, M
Set E ← MLMT, and set the old memory A area as an empty area
You. Write image information in the empty area in the state of (3)
The state of the error is the state of (4). In this state, memory B
Memory in the state of (4) when write instruction is given
There is no continuous empty area in the B area, and the memory B area and the empty area
, The area with the largest amount of memory in the empty area
This is a new memory B area. At this time, the empty area is the largest
If the memory capacity is large, MS ← 0, ME ← MCS-1
The old memory B area is set as an empty area. This
Image writing succeeded in new memory B area after setting
Case is (5), and image writing failed
Is the state of (6), and compression to memory has failed.
In this case, the written memory area becomes an empty area.   In the states of (5) and (6), the memories A,
For determination of MS and ME when memory B and memory C are specified
Table 19 shows the memory amount comparison.   In this way, the empty area is the maximum number of
The same number occurs. MAS, MB is the amount of memory for this empty area
S, MCS, MAE, MBE, MCE
Memory management can be performed. For example, set in MS, ME
Writing an image to the new area failed (image compression error
-) MA-VIDEO, MB-VIDEO, MC-VIDEO
Is set to the empty area by setting
Recognition also allows for reasonable memory management.
I can. In this embodiment, the number of designated memory areas is "3".
However, depending on the amount of memory, even if the number of
Can appear.   The following is a description of the RMU mode “retention mode”.
Refer to the flowchart of Fig. 29 for the explanation as shown in Fig. 13.
A3 size image (297mm main operation, 420mm sub operation)
70 mm from the main scanning direction and 100 mm in the sub-scanning direction from report A
Output image information B of 140mm x 210mm
The case will be described as an example. RMU is RMU mode command
Table 4 is input as the second byte of the command. Bit 6, Bit
5 indicates that the output density of the leader image and the RMU decompressed image is about 50
%, And both are set to “1”.
Then, as RMU mode, as shown in 104-2 in Table 5, bits 4,
Bit 3, Bit 2, and Bit 1 are set. Memory indication
Memory A is designated as
And enter Table 6. RMU trimming command 1
Main scanning compression start position Hp (70m
m), RMU trimming instruction command 2 trimming data
Sub scanning compression start position Vp (100mm), RMU trimming
Main scan compression width as trimming data of instruction command 3
Hw (140mm), Trimming of RMU trimming command 4
Sub-scanning compression width Vw (210mm) is set as
Is output from the reader in millimeter units (S-
106-A-1). Controller 10-2 receives the
The above position information is converted into bit units / line units, and Hp =
1102 bits, Vp = 1574 lines, Hw = 2204 bits, Vw = 3307
The compressed image position / size information corresponding to Fig. 13 of the line
obtain.   Depending on the specified RMU mode, the selector SEL1
(10-18), SEL2 (10-19), SEL3 (10-20), SEL4 (10
−21), SEL5 (10−22) and video selector (10−23)
R-VCLK, R-VDA, R-VE, R-VE, P-BD, A0, B0
Select input. Image signal from reader to compressed image memory
The dither signal shown in Fig. 11 is L level to store it after binary compression.
To RMU mode is “Memory High Speed Mode” (R
MU internal mode is “retention mode”)
Receiving the printer start command output by the reader,
It is passed through the printer (S-106-A-3). RMU is pre
Input a PREQ signal indicating that the printer is ready to feed paper (S-106).
-A-5), and outputs this signal to the reader (S-106-).
A-6). At this point, the “Memory High Speed Mode”
Is currently being executed (S-106-A-
7) Paper size finger to specify output paper size from reader
Command (S-106-A-8) and the MA-PSZ
To be stored. Based on the specified output paper size,
Various counters described below are set. First mentioned above
MS (compressed image writing start address), ME (compressed image
Memory address count setting)
To the comparator 10-8 and the comparator 10-14. The data shown in Fig. 11
The down counter 13-1 of the Isa counter has 1245H (467
7) Top 10 bits 248H (584), but also downcount
The lower 3 bits 5H (5) are set in the data 13-2. No.
12 Similarly, the down-scan
The counter 14-1 is set to 1245H (4677). still,
Comparators 14-2 and 14-3 are set only for decompression.
Not set, comparators 14-4 and 14-5 are equivalent to Hp
55BH (1371), corresponding to DF7H (3575) and Hp, Hw
DARD is operated simultaneously with HADR.
The setting of 1245H (4677) is performed on the lator 14-8.   When the RMU receives the PRINT signal from the reader (S-106-
A-10), and output to the printer (S-106-A-12). V
When the SREQ signal is input from the printer (S-106-A-1)
3) Output to the reader (S-106-A-14).   The RMU mode at this point is “Memory High Speed
Mode is the first sheet, so the RMU internal mode
(S-106-A-18).
And input VSYNC ON from the reader in Fig. 30
(S-106-F-1), and turn on the printer.
Is turned on (S-106-F-2). Fig. 13 Vp
62 to 10-11 line counter to generate 1574 lines
6H (1574) is set and the line counter counts up.
(S-106-F-4), the sub-scanning compression section signal
The signal V-ENC is turned on (S-106-F-5). Fig. 13 B area
The sub-scanning width Vw3307 of the area is set in the line counter (S
-106-F-6). By setting the above selector, the reader
10-11 lines while passing the image from the printer to the printer
The compression circuit 10- is stored in the compressed image memory 10-5 until the counter ends.
4 is written (S-106-).
F-7, S-106-F-8). Image pressure for a given number of sub-scan lines
Counter of line counters 10-11 indicating the end of compression
If a tip is detected, the V-ENC signal is turned off (S-106-F
-9) If you input the VSYNC off state from the reader
(S-106-F-10), turn off VSYNC to the printer
(S-106-F-11).   After this, writing to the compressed image memory succeeds or fails
In order to determine whether the MOVER signal has been
Signal (S-106-C-1), and the MOVER signal goes high.
If it is a bell, it is determined that writing to the memory has failed,
The compression failure flag is set (S-106-C-2).
Compression failure (RMU message)
Memory overflow) information to the reader.
Wear. With this information, the reader can use the compressed memory
Judgment that the tension operation is abnormal, and the second and subsequent
Repeat image output by manuscript scan and copy operation
finish. This function allows the image signal from the reader
Number of copies even if the
The peak is output from the printer. At this time, the RMU
The memory area where the image is being written is assumed to be an empty area.
The RMU internal mode is set to “through” due to the compression failure flag.
Change to “out-out mode.” “Through-out mode”
Is the same as “Memory pass mode”, and the V-ENC signal is
ON in response to VSYNC of the reader (L level to H level)
) And off (from H level to L level).
The RMU does not perform the compression operation, and the selector and counter
Set “Retention mode” and set
When VSYNC is input, output VSYNC to the printer (Fig. 33,
S-106-D-1, S-106-D-2), image from reader
Through the printer (S-106-D-3), from the reader
Wait for VSYNC. (S-106-D-4), VSYN
If C is input, turn off VSYNC to the printer (S-
106-D-5), The reader outputs image information for the set number.
When completed, output the printer stop command and
Stop the printer. The RMU uses this printer
Command, the copy sequence is terminated (S-10).
6-C-6).   Conversely, if the MOVER signal is low,
Writing to the reader is successful, so inform the reader about this.
Notify by real communication, and scan the second and subsequent originals of the reader.
To stop decompressing the image from the RMU's compressed image memory.
Perform a copy operation. To output a decompressed image, select
And counter must be reset.
The "output mode" is reset (S-
106-C-4, S-106-C-5). Fig. 10 SEL1, SEL2, SEL3,
SEL4, SEL5 and video selector are I-CLK, DVDO, P-
Select the input of BD, OVE, HSYNC, A2, B2, and store the compressed image memory
Stores compressed image data obtained by binary image compression.
Can be determined by the content of MA-METHOD. According to
11 to expand the compressed image data into a binary image
Ther signal is set to L level.   The MA-PSZ,
From the memory area specified by MB-PSZ and MC-PSZ
The size of the original image data that was extracted and compressed and stored
Is the area B in FIG. 13, that is, 2204 × 3307.
The down counter 14-1 shown in FIG.
As described for elongation, 12F4H (4852), 14-2, 14-3, 14-
4,14-5,14-6,14-7,14-8 comparators
1247H (4679), 2H (2), 1247H (4679), 9ABH (247
5) Set dF9H (3577), 55dH (1373), 1247H (4679)
However, the “output mode” is not
Set 0 to decompression error counter 10-35 to perform lengthening
You. The down counter 13-1 of the dither counter shown in FIG. 11,
Set 1H (1) and 1BFH (447) in 13-2 respectively
(S-106-C-5).   The reader compares the unit status request with the error
Data that the RMU memory overflow has not occurred.
Upon recognition, the reader stops document scanning. Leader is VS
Since the YMU is not output, the RMU must wait for VSYNC from the reader.
Turn on VSYNC to the printer (S-106-H)
-2). Also, the margin V in the sub-scanning direction_P1574 line count
(S-106-H-)
3) If the line counter is up (S-106-)
H-4), turn on the V-DEC signal,_WMinute sub-scan line
The number 3307 lines are set in the line counter (S-106-
H-8) Check image expansion and expansion error check
Until the printing is completed (S-106-H-9). In this embodiment,
If eight or more decompression errors occur, the decompression error
Set copying and stop the copy operation. RMU is the extension error
-Serial to the reader that the specified number of times (8 times) has occurred
Communicate via communication, and the reader will receive more than a predetermined number of decompression errors.
Output the paper feed command (PRINT) after it is determined that
And stop the copy operation. RMU stops decompression operation
To turn off the V-DEC signal,_RMinute sub-scan line
After the line counter has been set up,
Turn off VSYNC to the computer. The reader is
Printer stop command to notify the printer of the stop
The printer outputs this command and the printer inputs it to stop copying.
Stop. When no decompression error has occurred more than 8 times
The RMU repeats the expansion operation (set number-1) times
Stopped by printer stop command from reader
(S-106-C-6).   Next, the memory path mode will be described with reference to FIG.
You. Memory pass mode uses three values from the reader as described above.
The two image signals RVDA and RVDB to be represented are stored in the compression memory.
This is the mode in which the data is transmitted directly to the printer without using it.   That is, in the memory path mode, the selector shown in FIG.
Select A1 and B1 in 10-23. Also, R-VCL from reader
Selector 10-18 is selected and operated to set K to 0SYS.
Selector 10-22 to set P-BD from printer to HSYNC
Is operated (S-106-A-2).   After this, the control signal coming from the reader will be
Control signals coming from the printer to the reader.
Output as it is, as if there was no RMU
Operate. That is, when the VSYNC from the reader is turned on (S
-106-D-1), turn on VSYNC to the printer,
Image from reader to printer through selector 10-23
Pass through (S-106-D-2, S-106-D-3). Soshi
Then, if VSYNC from the reader is turned off (S-106-
D-4), turn off VSYNC to the printer (S-106-D-).
5) If a printer stop command is input
Stop printer operation. Meanwhile, the printer stop
If no command has been entered, the same processing is performed again
Repeat for minutes.   Next, in the “memory input mode”, the compressed image memory
Read the image written in the “Memory Overlay Mode”
The following describes an example of combining with an image from a printer and outputting to a printer.
You.   As the first step in performing memory overlay operation,
Image information must be written. This memo
The RMU mode for writing image information to the memory
Input mode ". Trimming area B in FIG.
The RMU instruction when the data is compressed and stored in the memory C area is
0 The second byte of the RMU mode instruction command
The second byte of the RMU memory instruction command shown in the table
As shown in the table, from the operation unit of the reader by the operator
Trimming finger based on trimming area designation data
From the command 1 to the RMU trimming command 6
Input the contents of the mining data from the reader. “Memory
In the “input mode”, the printer 100-2 in Table 1
The start command does not need to be output to the printer,
Since the printer does not perform the copying operation, the SE shown in FIG.
Select L1, SEL2, SEL3, SEL4, SEL5 and video selector
Set to R-CLK, R-VDA, R-VE, R-VE, HSYNC, A0, B0 respectively.
(S-106-A-2). Also, the printer performs copy operation.
The PREQ signal is not output to the RMU because
Outputs a PREQ signal to the reader instead of the printer (S-
106-A-4, S-106-A-6). Serial from reader
By communication.   When the paper size instruction command is received, the memory C
Specified, the MC-PSZ is stored in the memory of the control unit of the RMU.
(Paper size of memory C), and store and hold the paper size.
METHOD (Read image information stored in memory C area
Mode is also stored.   Paper size and trimming data H input from reader
_P(Main scanning reference position), V_P(Sub scanning reference position), H_W(Main run
Width), V_W(Sub scanning width), H_M(Main scanning movement position), V_W(Vice
(Scanning movement position), the down counter (14-1)
4677, H for comparator (14-4)_PMore 3575, Compa
H for the lator (14-5)_W1371, comparator (14−
8) is 4677 from the paper size, and the dither counter (14-1)
Sets 4677. Memory address counter (10-
8) contains the MS (compressed image writing start address),
The ME (compressed image maximum writing
The dress is set (S-106-A-9).   RMU receives PRINT signal from reader (S-106-
A-10), because the printer does not perform the copy operation,
Output the VSREQ signal instead of the printer.
(S-106-A-11, S-106-A-14). Re
When VSYNC ON is input from the coder (S-106-B-1),
Fig. 17 V to area B_P(1574 in this example) Line compression
V to the line counter (10-11) to prevent_PTo
Set (S-106-B-2). Line counter
It is detected that the device has been up (S-106-B-3),
Turn on the V-ENC signal to start the compression operation (S
-106-B-4). Also, the sub-scanning width V to be compressed_W(This example
3307) is set in the line counter (S-106).
-A-5). Then, the line counter counts up.
(S-10).
6-B-6, S-106-B-7). Line counter counts
In order to stop the compression operation upon detecting that the
The V-ENC signal is turned off (S-106-B-8). Then
When the VSYNC signal from the coder is turned off (S-1
06-B-9), memory over (memory address count)
Data exceeds the maximum address for writing compressed images).
MOVER signal is detected to check
(FIG. 31, S-106-C-1).   If the MOVER signal is at H level, writing to memory
Compression failure information is sent to the reader, indicating failure.
(S-106-C-)
2). As a result, the above-mentioned unit
RMU compression failure information is added to the
Recognize defeat. If compression fails, MC-PSZ (me
Mori C paper size), MC-METOD (reading mode), M
CS (memory C start address), MCE (memory C end address)
Less), MC-VIDEO (compression mode) information to memory C
Performs the same settings as those in which nothing is written. this
Recognizes the specified memory area as an empty area when compression fails
Then, it can be effectively used for the next compression operation. on the other hand,
Upon successful compression, MCS, MCE, MC-METHOD, MC-VIDEO, MC-P
Stores information necessary for SZ. These are memory C area
It is used at the time of extension. Reader to printer stopco
Command is entered (S-106-C-6), the RMU
The sequence processing ends.   Now, for example, the memory B
It is assumed that A4 size image information is compressed and stored. So
The image information in “Memory Overlay Mode”.
The image information from the reader and output it to the printer.
Think about it. Decompressed image from RMU compressed image memory
Sets bit 5 of the second byte of the RMU mode command
By setting it to “0”, the density of the printer is about 50%.
Output. In addition, in FIG.
H in the inspection direction₁= H_PBit, V in sub-scan direction₁= V_PBit point
The reference point t₁As the main scanning size H_Two= H_WBit, sub-scan
Size V_Two= V_WTrim bit image area (T area)
RMU mode instruction command when outputting to A4 size
The second byte of Table 25 is the one in Table 25.
As shown in Table 26 as the second byte of the command,
Command from RMU trimming command 1
6 from trimming data 1 to trimming data 6
As converted to bits or lines
H_P, V_P, H_W, V_W, H_M, V_MIs set and the reader
Is output to the RMU.   RMU is shown in Fig. 10 Selector 1, Selector 2, Selector 3, Select
R-VCLK, DVD
Select O, LN-ST, R-VE, P-BD, A3, B3
The signal is set to L level.   Now, in FIG. 34, the sub-scanning transfer of the T region of the expanded image
The moving direction is determined (S-106-G-1). As a result, T
The moving direction of the area is the same as the sub-scanning direction as shown in FIG.
If so, proceed to FIG. 35.   Then, input the paper size instruction command from the reader.
If it is, store it separately from the paper size of the compressed image.
Good. Processing for PREQ, PRINT, and VSREQ signals
"Memory pass mode" or "through-out mode"
Since they are the same, the description is omitted.   The stored paper size and trimming data
H converted to line_P, V_P, H_W, V_W, H_M, V_MBy the counter
Set as follows. 4677 for comparator 14-4,
0 for comparator 14-5, 46 for comparator 14-8
77, 4677- (H_P−
H_M) And 4677 are set in the counter 14-1.   When the moving direction of the image in the T area is the same as the sub-scanning direction
At the same time that VSYNC is input from the reader (S-1
06-H-1), and turns on VSYNC to the printer (S-106-
H-2), from VSYNC which output V-DEC signal to printer
(V_M−V_P) Line
The counter is set (S-106-H-3). Lineka
After counting up the counter (S-106-H-4),
Scan V_PTo set the TRM signal for the line to L level,
1FFFH for the comparator 14-6 and 4677 for the comparator 14-7
set.   HADR and DADR are 4677 and 4677- (H_M−H_P)
Set (S-106-H-5) and turn on V-DEC signal
(S-106-H-6). To perform trimming,
Number (S-106-H-7), and v_PCounsel for line
After counting and counting up (S-106-H-
8, S-106-H-9), the image in the T region is expanded.
(S-106-H-10)
V to Unta_WSet the line (S-106-H-11)
Synthesizes the image from the decoder and the image in the expanded T region.
Yes, V_WAfter performing the combining operation for the lines (S-106-H-1)
2) Turn off the V-DEC signal to stop the decompression operation
(H-106-H-14).   On the other hand, the sub-scanning movement direction of the T region of the
In the case of the direction opposite to the sub-scanning direction as shown in FIG.
From (S-106-G-1) in the figure, proceed to FIG.
A4 size image expanded from compressed image data from memory
Sub-scanning image position V from signal₁= V_P, Subscanning image size V_Two= V
_WTrimming the T area, and make sure that the
T₁Distance V to_Three= V_MMove in case of
To combine the image signals from the
Correspondingly, the control operation of the controller 10-2 is shown in FIG.
Execute.   Main scan image position H₁= H_P, Main scanning image size H_Two= H_WBecome
In the T area in the main scanning direction, t₁Distance to H_Three
= H_MWhen moving the counter, see FIG.
The load value of (HADR) is 4677, and the
4677 for the parator 14-4 and 0 for the comparator 14-5
set. Comparator to activate dither counter
14-8 is set to 4677, and the dither counters 13-1, 13-
2 has 4677- (H_M−H_P) Is set (S-106-I-).
1). Here, SEL1 (10-18) is set to φSYS as ICLK.
Set, and the pressure of the memory address counter 10-8.
Set the start address of the reduced image data, and
Signal is turned on, and decompression of the compressed image is started. Where
The expanded image U is copied in the sub-scanning direction by the
-Line length protruding from paper (V_P−V_M) Minutes line
Count (S-106-I-3) and turn off the V-DEC signal once
Then, the decompression operation is interrupted (S-106-I-4).   Subsequent image decompression is performed by VSYNC (PVSYN
C) Synchronization with the clock of reader 10-1
ΦSYS selects RVCLK by 1 (10-18). This
Main image when the image from the reader and the image in the T region are combined.
Irregularities of pixels in the scanning direction can be prevented. This state
State, detects VSYNC from the reader,
0-2 outputs the resist feed signal PVSYNC to the printer
(S-106-I-6) and sub-scan V_MDuring the line,
The TRM signal is set to L level so as not to output the expanded image.   This means that 1FFFH is applied to the comparator 14-6,
This is realized by setting 4677 to the data 14-7 (S-10
6-I-7). Thereafter, the suspended image decompression starts.
Therefore, the value of the memory address counter 10-8 is
And turn on the V-DEC signal. Where T
V until the image of the area is output_MLine to line counter 10
Count at -11 (S-106-I-9).   Next, in order to trim the image in the T region, the TRM signal
Set the comparator to generate the signal, Figure 22
From (c), comparator 14-6 is 4677-H_MAnd compa
Lator 14-7 is 4677- (H_W+ H_M(S-106-I)
-10).   As a result, the image in the T region is changed to t in FIG.₁Location
From copy paper t₁′.   Next, the controller 10-2 calculates the V of the sub-scanning width of the T region._W
Lines are counted by the line counter 10-11 (S-106).
-I-11), The image signal in the T area was output to the printer
Is detected, and the VDEC signal is
It is turned off (S-106-I-12).   This allows the controller 10-2 to decompress the compressed image signal.
Since output has been completed, all images from reader 10-1
Wait for output to printer 10-3 (S-106-I-1)
3). If it detects that the reader's PVSYNC is turned off,
Turn off VSYNC (PVSYNC) to printer 10-3, and
Output of one image to the printer 10-3 is completed (S-106-I-1).
4) Check whether the specified number of copies have been completed
In order to achieve this, the already explained FIG. 31 (S-106-C-6)
move on.   In this way, the RMU responds to the four modes specified above.
It works.   In this embodiment, image compression is performed by run-length encoding.
However, it is also possible to use compression methods such as MH and MR.
You. In addition, as the image synthesis, in addition to the superposition of the images, the first
Insertion of a second image into a predetermined portion of an image or
In the same way, functions such as combining only the desired parts
Can be achieved.   As described above, according to the present invention, the input first
The first image signal representing the original image is compressed and stored in advance.
In advance, the first compressed and stored first image
A first image signal obtained by expanding the image signal and a second image signal
And a second image signal representing the original image of the original.
Form a composite image of the first and second original images using the composite image signal
Can also be synchronized with line-by-line image formation
First image compressed in synchronization with the line synchronization signal
Extends the signal line by line and synchronizes with the line synchronization signal
Then, the second image signal is input for each line,
Further, a vertical synchronizing signal indicating the start of input of the second image signal
Count the line sync signal from the input, and based on this count value
To control the start of the decompression operation.
The expanded output of the first image signal represents the second original image
The one that is surely synchronized with the input of the second image signal
Therefore, the first image signal and the second image signal are appropriately
It is possible to combine the images exactly, and based on the combined image signal
A composite image of the first original image and the second original image
It becomes possible to form well.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a configuration example of an image processing system to which the present invention is applied, FIG. 2 is a diagram for explaining an image reading operation by a reader, and FIG. 3 is a schematic circuit configuration of the reader. FIG. 4 is a diagram showing a schematic configuration of a printer, FIG. 5 is a block diagram showing a schematic circuit configuration of the printer, FIG. 6 is a diagram showing the contents of a video interface, and FIG. FIG. 8 is a diagram showing a transmission system, FIG. 8 is a diagram showing various signals of a video interface, FIG.
10 is a block diagram showing a detailed configuration of the RMU, FIG. 11 is a configuration diagram of a dither counter, FIG. 12 is a configuration diagram of a main scanning counter decoder, FIG. 13 is a diagram showing a trimming state of a document image, and FIG. FIG. 14 is a timing chart showing a compression operation of an image signal, FIG. 15 is a diagram showing a storage state of a memory, FIG. 16 is an explanatory diagram of dither compression, and FIG. 17 is a timing chart showing an expansion operation of an image signal. FIG. 18, FIG. 18 is a timing chart showing an operation at the time of decompression error, FIG. 19 is a diagram showing a trimming operation in the main scanning direction, FIG. 20 is a diagram showing a trimming operation in the sub-scanning direction, and FIG. FIGS. 22 (a) and 22 (b) show the image moving operation in the main scanning direction, FIGS. 22 (a), (b) and (c) show the image moving operation in the sub-scanning direction. FIGS. FIG. 24 is a flowchart showing a procedure of serial communication of a command. Is a flowchart showing the serial communication procedure of status, FIG. 25 is a flowchart showing the communication procedure before the copy operation, FIG. 26 is a flowchart showing the operation of the reader, and FIG. 27 is the operation of the printer. FIG. 28 is a diagram showing the state of the memory area, and FIGS. 29 to 36 are flow charts showing the operation procedure of the RMU. 1-1 is a reader, 1-2.
Is an RMU, 1-3 is a printer, 10-2 is a controller, 10
-4 is a compression circuit, 10-5 is a compressed image memory, 10-6 is an expansion circuit, 10-15 is a double buffer memory, 10-23 is a video selector, and 10-8 is a memory address counter.

   ────────────────────────────────────────────────── ─── Continuation of front page       (56) References JP-A-57-174982 (JP, A)                 JP-A-57-129566 (JP, A)                 JP-A-58-6671 (JP, A)

Claims (1)

(57) [Claims] Input means for inputting, for each line, first and second image signals representing first and second document images, compression means for compressing the first image signal input from the input means, Storage means for storing the first image signal compressed by the means; expanding the compressed first image signal read from the storage means, and outputting the expanded first image signal line by line Expanding means for synthesizing a first image signal output for each line from the expanding means and a second image signal input for each line from the input means, and outputting a synthesized image signal for each line A synthesizing unit; and an image forming unit that forms a synthesized image of the first and second document images for each line based on a synthesized image signal output line by line from the synthesizing unit. The same applies to the line-by-line image formation of the image forming means. In synchronization with the line synchronization signal, the compressed first image signal is expanded line by line, and the input unit synchronizes the second image signal line by line in synchronization with the line synchronization signal. The synthesizing unit further includes a counting unit that counts the line synchronization signal from an input of a vertical synchronization signal indicating the start of input of the second image signal from the input unit. The image processing system according to claim 1, wherein a decompression operation is started and controlled by said decompression means based on a count value of said line synchronization signal.