JPH0734587B2 - Video printer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a video printer for printing a video signal such as a TV broadcast or a VTR, and in particular, an input image, a memory image or an adjusted image is immediately switched for comparison and confirmation. Can be a video printer.

[Conventional technology]

The conventional device is NHK Giken Monthly Report Vol. 28 No. 2 (1985
Mon) As discussed from page 42 to page 48,
Although it is possible to read the contents of the frame memory at the television signal rate and output them to the monitor to check the printed image, check the switching between the input image and the memory image or the adjusted image, and check the memory image and the printed image. No comparison was confirmed.

[Problems to be solved by the invention]

In the above-mentioned conventional technique, the input image and the memory image or the adjustment image are switched and compared for confirmation so as to obtain a desired print image, or the memory image and the memory adjustment image sent to the printing unit are switched and confirmed for comparison. Had a problem that it was not considered.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to compare and confirm by switching the image signal to be confirmed and displaying it on a monitor, and adjusting the input image and the memory image or the memory image and the memory output. It is to provide a video printer that can compare and confirm the adjusted image.

[Means for Solving Problems] The above object is to provide two paths as signal paths, for example, a path passing through an image memory and a path not passing through, or a path passing through an image adjusting means and a path not passing through. ,
This is achieved by switching at least these two paths and outputting to the monitor.

[Action]

The switching means for selecting one of the signal path not passing through the image memory and the signal path passing through the image memory can arbitrarily switch. When the switching means selects the signal path that does not pass through the image memory, the continuously input video signal is output to the monitor through the signal path.

On the other hand, when the signal path selected via the image memory is selected, the still image stored in the memory or the moving image passing through the continuous memory is output to the monitor. Further, when adjusting the image of the image to be printed out, the adjusted image and the unadjusted image can be easily compared and examined by switching the signal passing through the image adjusting means and outputting to the monitor.

〔Example〕

 An embodiment of the present invention will be described below with reference to FIG.

In the figure, 1 is a system controller (hereinafter abbreviated as system controller), 2 is an automatic gain control circuit (hereinafter abbreviated as AGC circuit), 3 is a decoder processing unit, 4 is a digital memory unit, 5 is a print processing unit, 6 Is the encoder processing unit,
Reference numeral 7 is a signal switch, 8 is an output switch, 9 is a power switch, 101 is a power input terminal, 102 is a video signal input terminal, 103 is a video signal output terminal, and 104 is an output select signal input terminal.

Here, the decoder processing unit 3 uses a luminance / chromaticity separation circuit (hereinafter referred to as Y /
Called C separation circuit) 31, color demodulation circuit 32, synchronization processing circuit 3
3, matrix 34, and adjusting means 35. The digital memory unit 4 includes an analog / digital converter (hereinafter abbreviated as ADC) 41, a frame memory 42, a digital / analog converter (hereinafter abbreviated as DAC) 43, a write control unit 44, a read control unit 45, and a read. The synchronization signal generator (hereinafter abbreviated as SSG) 46 is configured. The print processing unit 5 includes a data selector 51, a halftone control unit 52, and a print head unit 53.

Next, the operation will be described.

Syscon 1 is on / o of system power switch (not shown)
The power switch 9 and the output switch 8 are switched by ff. When the power switch is off, the power switch 9 is opened and the output switch 8 is connected to the a side, and the input video signal is output to the output terminal 103 via the AGC circuit 2. When the power switch is turned on, the power switch 9 is closed and power is supplied to the entire system, and the output switch 8 is connected to the b side.
A signal from the encoder processing unit 6 is output to the output terminal 103 as described later. Incidentally, this output terminal 103,
An unillustrated monitor is connected, and an image is displayed by the video signal output from the output terminal 103.

Now, in the decoder processing unit 3, the output of the AGC circuit 2 is separated by the Y / C separation circuit 31 into a luminance (Y) signal and a chromaticity (C) signal. The C signal is further supplied to the color difference signal (R
-Y, BY) is demodulated. The color difference signal and the Y signal are converted into three color original signals (R, G, B) in the matrix 34. These processing timings are all synchronous processing circuits.
Controlled by 33. One of the three-color original signals is supplied to the terminal a of the signal switch 7, and the other is supplied to the digital memory unit 4.

Next, in the digital memory section 4, the input three color original signals (R, G, B) are converted into digital video signals by the ADC 41,
Write to the frame memory 42. This operation is a synchronous processing circuit
This is performed by the write control unit 44 controlled by 33. When the writing to the frame memory 42 is completed, a read operation is started by an instruction from the syscon 1. The operation at this time is performed by the read control unit 45 controlled by the SSG 46. The read digital video signal is
By this, the analog three-color original signal is restored again and is supplied to the b terminal of the signal switch 7. On the other hand, the digital video signal from the frame memory 42 is also sent to the print processing unit 5 in the next stage.

The operation of the print processing unit 5 can be variously considered depending on the printing method, but in this embodiment, the three-color plane sequential printing method will be described. Therefore, the selector 51 selects the digital video signal of one color to be printed, converts it into the energizing pulse in the halftone control section 52, and prints it in the print head section 53.

As described above, to the input of the signal switch 7, the output of the decoder processing section 3 is connected to the a terminal and the output of the digital memory section 4 is connected to the b terminal, which are input via the syscon 1. It is switched by the output select signal when the three primary color signals (R, G, B) are shared. The output from the signal switch 7 is restored to the original video signal in the encoder processing unit 6, and then output from the output terminal 103 via the b terminal of the output switch 8.

In the above operation, the write RGB signal input to the frame memory 42 and the read R signal output from the frame memory 42
The ADC41 and DAC43 are adjusted so that they are exactly the same as the GB signal except for the digit error. That is, the output video signal written to and read from the frame memory 42 and the output video signal from the decoder processing unit 3 are exactly the same video signal. On the other hand, the image obtained by displaying the output video signal via the frame memory 42 on the monitor and the print image printed by the print processing unit 5 are adjusted to be exactly the same.

Therefore, by changing the adjusting means 35 while the signal switch 7 is connected to the a side, it is possible to continuously display desired images while watching the image displayed on the monitor without performing the reading / writing operation on the frame memory 42. Can be variably adjusted.

Further, if the signal switch 7 is connected to the b side by the output select signal input via the system controller 1, the data read from the frame memory 42 is output, so that the print image can be confirmed on the monitor. .

Also, when the power switch is OFF, as described above,
An input video signal is output from the output terminal 103 via at least the AGC circuit 2.

A second embodiment of the present invention is shown in FIG.

The configuration shown in the figure is a system in which the output of the ADC 41 and the output of the frame memory 42 are switched at the digital level by changing the position of the signal switch 7 in FIG. 1, and other configurations and operations are exactly the same as in FIG. .

A third embodiment of the present invention is shown in FIG. 2 is different from FIG. 2 in that a video memory 47 is used instead of the signal switch 7 and the frame memory 42.

In the configuration of FIG. 3, the SSG 46 outputs a sync signal in synchronization with the sync signal separated from the external video signal when writing data to the video memory 47, and controls the data write control unit 44 and the data read control unit 45. .

An example of the memory configuration of the video memory 47 is shown in FIG.

In the figure, 471 is a data input terminal, 472 is a data output terminal, 473 is a data output select signal input terminal, 474 is a shift register input select signal input terminal, 475 is an address input terminal, and 476 is a data write / write of the video memory 47. Read mode switching signal (W / R signal) input terminal, 477 is a data output switch, 478 is a shift register input switch, 479 is a shift register, 480 is an inverter, 48
1 is a switch for outputting memory array data, 482 is an address decoder, and 483 is a memory array.

Now, it is assumed that the memory array 483 has a structure of m rows × n columns. The address decoder 482 selects one of the m rows according to the address given to the address input terminal 475. When the video memory 47 is in the data write mode, the data stored in the shift register 479 is stored in the memory register.
When writing to the array 488 and in the data read mode, the data for one row at the given address is stored in the memory array.
Output from 483 and give to shift register 479. The shift register 479 is composed of one row of data n bits of the memory array 483.

The switches 478 and 481 are changeover switches for data input to the shift register 479, and are controlled by a shift register input select signal so that one switch is always closed and the other switch is opened. The switch 477 switches the output data and data input of the shift register 479 to determine the data output of the video memory 47.

Now the video memory 47 is in the write state, switch 47
When 8 is closed and the switch 481 is open, the data input to the data input terminal 471 is selected and input to the shift register 479. At this time, if the switch 477 is connected to the 9 side, the input data to the video memory 47 becomes output data as it is and is output to the monitor via the DAC 43 shown in FIG. If the switch 477 is connected to the b side, the output data of the shift register 479 is output to the monitor. Now, if the delay time of the video signal due to n bits of the shift register 479 is 1H period, the monitor displays the actual input video signal with a delay of 1H, but this does not hinder the confirmation of the image. These operations are performed without passing through the memory array 483 which is a data storage unit, and it is possible to continuously confirm the image on the monitor without performing the data writing / reading operation.

A fourth embodiment of the present invention is shown in FIG.

In the figure, 10 is an ADC, 11 is a sync signal separation circuit, 12 is an adjustment circuit, and 37 is a decoder processing unit adjustment circuit. Other components having the same functions as those in FIG. 1 are designated by the same reference numerals.

5 is different from that of FIG. 1 in that the signal output of the signal switch 7 is switched by the NT3 signal instead of the RGB3 primary color signal.
That is what is being done at the SC signal level.

By changing the adjusting means 12 with the signal switch 7 connected to the a side and the output switch 8 connected to the b side, the data can be continuously read while observing the image displayed on the monitor without performing the data writing / reading operation on the frame memory 42. Can be variably adjusted.

The same effect can be obtained by variably adjusting the decoder processing section adjusting circuit 37.

Even if the position of the signal switch 7 in FIG. 5 is the same as in the configuration of FIG. 2 and the signal is switched at the digital level, the same effect can be obtained.

A fifth embodiment of the present invention is shown in FIG. In the figure,
Reference numeral 36 is an adjusting means, and those having the same functions as those in FIG. 5 are given the same numbers.

The part different from FIG. 5 is that the position of the signal switch 7 is changed to switch the two inputs depending on the luminance signal and color difference signal levels, and other operations are exactly the same. With the signal switch 7 connected to the a side and the output switch 8 connected to the b side, the adjusting means 35 can continuously and variably adjust the data displayed on the monitor without writing or reading data in the frame memory 42.

The same effect can be obtained even if the position of the signal switch 7 in FIG. 6 is the same as in the configuration of FIG. 2 and is switched at the digital level.

〔The invention's effect〕

According to the present invention, the input image and the memory image or the adjusted image and the unadjusted image can be easily switched and displayed on the monitor, so that the memory image and the adjusted image can be compared and confirmed while looking at the monitor.

[Brief description of drawings]

FIG. 1 is a block diagram showing the first embodiment of the present invention, and FIG.
FIG. 4 is a block diagram showing a second embodiment of the present invention, FIG. 3 is a block diagram showing a third embodiment of the present invention, and FIG.
FIG. 5 is a block diagram showing the configuration of the video memory shown in FIG. 5, FIG. 5 is a block diagram showing a fourth embodiment of the present invention, and FIG. 6 is a block diagram showing a fifth embodiment of the present invention. 2 ... AGC circuit, 3 ... decoder processing section, 4 ... digital memory section, 5 ... printer processing section, 6 ... encoder processing section, 7 ... signal switch, 8 ... output switch.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04N 5/76 E 7734-5C 4226-5C H04N 1/46 Z

Claims (4)

[Claims] 1. A video printer for printing a video signal, comprising a video signal input section and an analog / digital converter for converting the input video signal into a digital signal.
Digital converting means, memory means for storing the output signal from the analog / digital converting means, printing means for printing the output from the memory means, output of the analog / digital converting means and output from the memory means And a video signal output section for outputting a signal from the digital / analog conversion means, and a video signal output section for outputting a signal from the digital / analog conversion means. . 2. The video printer according to claim 1, further comprising image adjusting means provided at a stage subsequent to the memory means. 3. A video printer for printing a video signal, comprising a video signal input section and an analog / digital converter for converting the input video signal into a digital signal.
Digital conversion means, memory means for storing an output signal from the analog / digital conversion means, digital / analog conversion means for converting an output signal from the memory means into an analog signal, and an output from the memory means Printing means, switching means for switching between the input video signal and the output of the digital / analog converting means, and a video signal output section for outputting a signal from the switching means, and at least a power supply to the memory means. A video printer, wherein A and a power supply B to said output switching means are used as separate power supplies and said output switching means is automatically switched to the input video signal side when power supply A is cut off. 4. A video printer according to claim 3, wherein an image adjusting means is provided at a stage after the memory means or at a stage before the analog / digital converting means.