JPH0777422B2 - Image communication method - Google Patents

Description

The present invention relates to an image communication method for transmitting image information, for example, via a telephone line.

[Conventional technology]

Conventionally, when reproducing a still image signal recorded in a floppy jacket on a field-by-field basis, the reproduced image is once stored in an image memory, the reproduced image is confirmed, and then transmitted via a telephone line or the like.

[Problems to be Solved by the Invention] However, at the time of image transmission, a still image signal is displayed on a monitor, the user confirms whether the image is a color image or a monochrome image, and whether the image is transmitted in the color image transmission mode or the monochrome image is transmitted. Although I specified whether to perform transmission according to the transmission mode, even if the image to be transmitted is a monochrome image, if the user mistakenly specifies the color image transmission mode, some signal corresponds to the color component. However, there is a problem in that it is wasteful in terms of transmission time and cost.

If such an erroneous designation is made, the transmission processing of the image transmission mode by the color image transmission mode is performed, so that the receiving side device originally has a black and white image due to the influence of noise during transmission. However, there is a possibility that the image may be reproduced as an image that cannot be faithfully reproduced.

The present invention aims to solve the above problems.

[Means for Solving the Problem] The present invention has been made to solve the above-mentioned conventional problems, and an image communication method for reproducing an image signal stored in a recording medium and communicating the reproduced image signal. As a transmission mode of the image signal to be communicated, a desired transmission mode is designated from a plurality of transmission modes including at least a color image transmission mode and a black-and-white image transmission mode (in the present embodiment, transmission is performed by the switch 15 in FIG. 1). The transmission mode is changed to the monochrome image transmission mode on condition that the designated transmission mode is not the monochrome image transmission mode and the reproduced image signal is the monochrome image signal (this embodiment). In the example, in step 7-7, "where the reproduced signal is ... in the monochrome field mode" and Table 1 are described.
It is displayed in a distinguishable manner as to whether the reproduced image signal is a color image signal or a monochrome image signal (in the present embodiment, the
(Corresponding to the display of FIG. (B)), it is displayed in a distinguishable manner whether the transmission mode is the color image transmission mode or the monochrome image mode (in the present embodiment,
(Corresponding to the display of FIG. 15 (c)).

〔Example〕

In the present embodiment described below with reference to the drawings, color or monochrome images recorded in respective tracks on a magnetic disk (hereinafter also referred to as video floppy disk) are reproduced, temporarily stored in a semiconductor memory, and then stored. A device that can be confirmed with a monitor that reads out image signals sequentially from this memory and transmits via a transmission line such as a telephone line is disclosed, but the present invention is limited to such a device. Obviously not.

<Structure of Embodiment Device> FIG. 1 shows a front surface of a still image transmission device to which the present invention is applied.

In FIG. 1, reference numeral 1 is for reproducing the reproduced video signal reproduced from the video floppy on a monitor as a visible image and confirming and selecting it before transmission.

18 is a housing part for housing an acoustic coupler which is a means for transmission, and 2 is a housing part for housing the acoustic coupler.
This is a shield plate for preventing the monitor 1 from being adversely affected by magnetism due to a magnetic substance such as a speaker contained therein.
It is shown in broken lines as it is located in the body.

3 is the playback track when playing video floppy.
Switches for moving NO in the direction of increasing NO, and switches 4 for moving in the direction of decreasing NO of track. Reference numeral 5 denotes a display switch, which is a switch for displaying a reproduction track NO, a transmission track NO, etc. on the monitor 1 as described later. A power switch 6 is turned on / off each time the power switch is pressed.
9 is a power LED, which is controlled to light up while the power is on.

Reference numeral 7 is a transmission start switch, 8 is a transmission stop switch for stopping transmission on the way, and 10, 11 and 12 are LEDs which are turned on according to the progress of the transmission sequence, which will be described later.

Reference numeral 13 is a battery meter for monitoring the power supply voltage of the transmission device, and 14 is an eject switch for taking out the video floppy jacket.

Reference numeral 15 is a switch for determining the transmission mode. The mode selected by this is 3 color (R, G, B), 2 color (Y and (RY) / The (BY) compressed data) and the modes shown as the monochrome mode include the frame and field modes. 16 is a playback mode selection switch,
Alternatively, field playback can be selected.

Reference numeral 17 is a level selection switch for adjusting the speaker output when acoustic coupler transmission is performed. 18 is the storage room. Reference numeral 100 denotes an insertion portion for inserting the video floppy, and Fig. 1 shows a state in which the insertion portion is opened at the time of insertion. After the user inserts the video floppy, the door is opened in the arrow direction. Is closed and loading is completed.

FIG. 2 is a block diagram for explaining the system configuration of the electric system of the device of this embodiment.

In FIG. 2, reference numeral 31 is a magnetic sheet incorporated in the video floppy disk, and the video signal of one field unit is recorded on the magnetic sheet 31 in the form of concentric tracks. The magnetic sheet 31 is rotationally driven by a motor 32 controlled by a motor drive circuit 33. The monitor drive circuit 33 is also controlled by the system control circuit 39. H
A and HB are reproduction heads, for example, in-line heads, and perform field reproduction or frame reproduction.
The regeneration head HA is connected to the A terminal of the switch 20, and the regeneration head HB is connected to the B terminal of the switch 20. The switch 20 is switched by a switching signal from the system control circuit 39. The output of the switch 20 is supplied to the reproduction process circuit 23 via the reproduction amplifier 21, and the reproduction process circuit 23
Reproduction luminance signal (Y), line-sequential color difference signal ((RY) /
(BY)), horizontal sync signal (HS), vertical sync signal (V
S), a dropout pulse (DOP) caused by the lack of a reproduction envelope, and a signal (C / M) indicating whether the reproduced video signal is color or black and white.

The output of the reproduction amplifier 21 is also supplied to the envelope detection circuit 22. The envelope detection circuit 22 constantly detects the reproduction envelope, and outputs a "H" level when there is a reproduction envelope, and outputs a "L" level when there is no reproduction envelope, that is, in the case of an unrecorded track. To do. The output signal of the envelope detection circuit 22 is supplied to the system control circuit 39.

The reproduction luminance signal Y and the line-sequential color difference signal (RY) / (BY) from the reproduction process circuit 23 are temporarily stored in the memory circuit 26 via the A / D conversion circuits 24 and 25, respectively, and the reproduction luminance is also stored. The signal Y is also supplied to the monitor circuit 1 via the adder 28 for monitoring the image. The adder 28 is supplied with a font pattern signal from the charactor generator circuit 29 in order to superimpose the display of the track number and the like on the image on the monitor circuit 1. This charactor / generator circuit 29 uses the data line 40, which allows rewriting of data for the designated charactor under the control of the system control circuit 39.
The rewriting control line 41 is used. In addition, the memory circuit 26
As shown in Table 1 described later, the field memories M ₀ , M ₁
Two are provided.

The memory control circuit 27 that controls the memory circuit 26 is supplied with the horizontal synchronizing signal HS, the vertical synchronizing signal VS, and the dropout pulse DOP from the reproduction process circuit 23. 42 is an address bus, 43 is a data bus, and 44 is a control line. A magnetic piece (not shown) is fixed to the magnetic sheet 31 for detecting the rotational phase, and the magnetic head HC reads the magnetic piece. Amplifier
Reference numeral 34 amplifies the output signal (PG pulse) of the magnetic head HC, and the output of the amplifier 34 is used to feed back to the motor drive circuit 33 to control the rotational phase of the magnetic sheet 31 and also to the memory control circuit 27. Also supplied to the memory circuit 26
It is used to control the.

Further, the PG pulse is also supplied to the system control circuit 39 and used for the progress of the system program and the timer count.

The memory control circuit 27 is also a system control circuit via the control line 47, the data bus 46 and the address bus 45.
Also connect to 39. Reproduction process circuit 23 to memory circuit 26
The reproduced video signal written in is taken into the system control circuit 39 via the data bus 43, the memory control circuit 27 and the data bus 46, and the system control circuit 39 sends the video data to the transmission control circuit 35. . The transmission control circuit 35 converts the input video data into a signal form (AM, FM, etc.) suitable for transmission, and sends it out to the transmission line from the output terminal 37 via the level adjustment circuit 36.

The output of the level setting switch 17 is input to the level adjusting circuit 36, and the output level changes according to the set level. Further, the level adjustment circuit 36 has a switch which is turned on / off depending on whether the output terminal 37 is directly connected to a telephone line or an acoustic coupler.
The output of 38 is also input, and in the former case, the output is always controlled at a constant level regardless of the output of the level setting switch 17 described above.

The system control circuit 39 is connected with various switches for designating the operation of this device. The track up switch 3 instructs the reproduction heads HA and HB to move in the increasing direction of the track number, and the track down switch 4 instructs reversely to move in the decreasing direction. The place switch 5 is for sequentially changing the characters to be superimposed on the monitor circuit 1 each time the character is pressed, and the operation sequence and the display character form will be described later. Reference numeral 7 is a start switch of the transmission operation for sending the reproduced video signal written in the memory circuit 26 from the output terminal 37. Reference numeral 8 is the above-mentioned switch for stopping transmission during transmission. The switch 15 is a switch for designating the transmission mode, and the system control circuit 39 recognizes the transmission mode by selecting any one of the four positions shown in FIG.

The switch 16 is for selecting a reproduction mode (field reproduction or frame reproduction), and the system control circuit 39 accordingly connects the switch 18 to either the A terminal or the B terminal continuously. , Or control is performed such that the fields are alternately switched every 1 field.

The LEDs 10 to 12 are the LEDs shown in FIG. 1 which are lit during transmission. As will be described later, the LED 10 is controlled in the phase mode, the LED 11 in the white mode, and the LED 12 in the data mode (video signal section). To be done.

Reference numeral 30 denotes a power supply circuit, which is controlled by the system control circuit 39 to DECKPWR for the video floppy reproduction unit, PB PWR for the reproduction process circuit unit, AD PWR for the A / D conversion circuit unit, MEMPWR for the memory circuit unit, and monitor circuit unit. MORI PWR, TX PWR to the transmission control circuit, and SYS PWR to the system control circuit to control the power on / off.

As shown in FIG. 22, the power supply circuit 30 is provided with a power supply battery VBA.
T, a transistor Tr for controlling the transistor T, and a power supply controller C for controlling the transistor Tr are included. Also the circuit
The output of the power switch 6 is supplied to 30, and when the power switch 6 is pressed in the power-off state, the controller C in the power supply circuit 30 starts operating, and then SYS PWR
The control transistor Tr is controlled so as to turn on, and the operation of the system control circuit 39 is started.

The output of the power switch 6 is the system control circuit 39
After the system operates, the system control circuit 39 detects this input level and controls the power on / off of the device, as will be described later. Reference numeral 9 denotes a power LED, which is controlled by the system control circuit 39 while the power is supplied to a part of the device (except for the controller C shown in FIG. 22). Reference numeral 41 is a detection circuit composed of a photocoupler for determining whether or not video floppy is inserted, and 35 is a transmission control circuit. The transmission signal is a code control signal, synchronization signal, white level, etc. shown in FIG. The image signal is, for example, AM or FM modulated while being made according to the instruction.

FIG. 3 shows a still image transmission data waveform of this embodiment. In such transmission, the transmission waveform for the single color when data is read out and transmitted according to the sequence described later using the memory circuit 26 shown in FIG. 2 is shown. In FIG. 3, the horizontal axis represents the time axis and the vertical axis represents the transmission data level. The symbols X and Y on the horizontal axis indicate the horizontal and vertical addresses of the memory corresponding to the data being transmitted. The structure of such a data waveform consists of a code part consisting of transmission data consisting of 1H (1H is the time required to transmit one horizontal line of the screen), a synchronizing part consisting of 3H, a white level part consisting of 2H, and 2H. It consists of a data start detection part and a video part.

The transmission data in the data section includes data indicating which transmission mode is frame transmission or field transmission, and data for distinguishing transmission color modes (monochrome or single color, two colors, three colors, four colors).

The sync part is repeated at a cycle of 1H (when lines 0 to XE dots are read at 1H and the sync part is generated, the 0-4th dot is the white level and the 5th-XE dot is the black level). This is a synchronization signal for knowing the line break of the signal section. The white level is a level corresponding to the white level of the video portion, and is a reference level signal for correcting a change in the transmission level depending on the state of the transmission line. Incidentally, in such a data waveform, the period of the synchronizing part and the white level part may be set to a long time such as 10 seconds.

Further, the 2H data start detection unit is provided in order to obtain the data start of the video signal more accurately.

FIG. 4 shows two-dimensionally arranged data of the image part. The horizontal direction is X = 0 to XE dots, and the vertical direction is Y = 0 to YE lines, which consists of a total of (XE + 1) × (YE + 1) dots.

<Operation of Embodiment> Next, the operation of the embodiment of the present invention will be described with reference to a flowchart.

FIG. 5 is an overall flow of this embodiment. It is assumed that the start in this figure starts when the power switch 6 is pressed from the power-off state of the system and the power supply circuit 30 supplies the power supply SYS PWR to the system control circuit 39.

First, necessary parameters are initialized in the system initialization routine step 5-1. Specifically, in order to recognize the track currently being reproduced by the system control circuit 39 after clearing the flag TX FLG indicating that transmission is in progress and after the video floppy is inserted into the insertion section 100. The flag ININFLG is set to determine whether or not it is necessary to perform the playback initialization operation, and the interrupt processing is performed to perform the transmission operation, but the flag IRQFLG that determines whether to start this is set and the interrupt processing is performed. Prohibit Also, while the power is on, if there is no track up, down, or transmission operation for a certain time (for example, 10 minutes), the timer OFF TIM for automatically turning off the power is preset. . In addition, the parameter DISP STS for determining the state of the track information multiplexed on the monitor is reset.

In addition, PB PWR, DECK PWR, MOMIPWR, MEM PWR,
All TX PWRs are turned off by controlling the power supply circuit. Further, the power LED is turned on and all the transmission sequence display LEDs 10 to 12 are turned off.

When the initial setting is completed, it is determined whether or not a program interrupt request for starting the program is generated (step 5-2). As described above, the program interrupt is, for example, 20 msec in the system control circuit 39.
Of the internal counter or the PG signal accompanying the video floppy playback, both of which are also used for timer operation. The former is selected when there is no video floppy, and the latter is selected when there is video floppy.

When a program interrupt occurs, it is detected whether or not the power switch 6 is pressed, and if it is pressed, the power supply circuit 30 is controlled, and the power supplied to each circuit is turned off. Also turn off the power, and then turn off the system.

If the power switch 6 is not pressed, the reproduction routine (step 5-4) described in detail in FIG. 6 is entered, and the reproduction deck control around the video floppy is performed. Furthermore, a transmission routine for controlling the transmission operation detailed in FIG. 7 (step 5-
5) Enter. Then, a character routine (step 5) for multiplexing track information on the monitor described in detail in FIG.
-6) Passes the power supply control routine (step 5-7) which mainly controls the power supply of the reproduction process circuit section and the disk section, returns to step 5-2 again, and waits for the next program interrupt.

<Reproduction Routine> Next, the reproduction routine in FIG. 5 will be described with reference to FIG.

First, it is judged from the output of the detection circuit 41 whether or not the video floppy is mounted (step 6-1). If it is not mounted, the PB PWR of the reproduction process section and the DECK P around the deck are set.
Power off WR and MONIPWR of monitor unit respectively (step6
-23), and set the playback initialization flag INI FLG (step 6-24).

If the floppy disk jacket is installed in step 6-1, check the status of the playback initialization flag INI FLG and set it to "0".
That is, if there is no need for playback initialization, step6−
9 or later, "1", that is, when playback initialization is required, PB PWR in the playback process section and DECK P in the deck section
Power on WR and MONI PWR of the monitor, respectively (st
ep6-3). Then perform playback initialization (step6−
4). This is because once the playback heads HA and HB are moved to the innermost circumference of the jacket and the absolute track position is recognized, the first
It is to move to the truck. Normally, it takes longer than the program interrupt cycle to complete this operation, but in the present embodiment, once a command for playback initialization is given to the motor drive circuit 33 and the head drive circuit 19, after that, these circuits are Automatically performs the above operation. When the reproduction initializing operation is completed, the reproduction track NO variable PBTRNO is set to 1 (step 6-5). If the operation related to the playback operation is not performed during the transmission operation,
A low power consumption mode is entered in which the power of the reproduction process section and the disk section is turned off, and the timer TPTIM for this is preset (steps 6-6). This timer LP TIM
Is set to about 10 seconds. The value of this timer may be, for example, about 10 seconds. Next, a timer OFF TI to turn off the power when there is no operation for a certain period of time as described above.
M is preset (step 6-7), and the reproduction initialization request flag INI FEG is cleared (step 6-8). The timer OFF TIM is set to a time longer than that of LP TIM, for example, about 10 minutes.

At step 6-9, it is judged whether or not the power consumption mode is currently entered. If yes, the process returns without executing steps 6-9 and below in order to ignore the following track up and down routines. If it is not in the low power consumption mode, it is checked whether or not the track up switch 3 is pushed (steps 6-10). If it is pressed, OFF TIM is preset (step6-12), and it is checked whether the current playback track NO is smaller than 50 (maximum track NO) (step6-13). If it is 50 tracks, the following steps are ignored. For step6−2
If it is smaller than 50, branch to 2 and feed the track one track in the direction in which PBTRNO increases (inner circumferential direction) (step6
-14), PBTRNO is incremented, and then LP TIM is preset (steps 6-16).

If the track up switch 3 is not pressed in step 6-10, check the state of the track down switch 4 (step
6-11). If it is not pressed, the track of PBTRNO is played (step 6-22), and if it is pressed, OFF TIM is preset (step 6-17). Only when it is large (steps 6-18), track feed is performed in the direction (outer peripheral direction) in which PBTRNO decreases (steps 6-19 to 21). When the track feed operation is performed in this way, PBTRNO
Play the track. Since OFF TIM and LP TIM are preset when this upgrade is performed, the clock is restarted from this point.

<Transmission Routine> Next, the step 5-5 transmission routine of FIG. 5 will be described with reference to FIG.

If the status of TX FLG is "0", that is, if transmission is not in progress, it is judged whether or not transmission start switch 7 is pressed (step 7-2). If not pressed, transmission control circuit 35 and circuits 26, 27 Power supply for memory part consisting of TX PWR, MEM PWR
Is turned off (steps 7-16). If it is pressed, OFF TIM is preset (step 7-3), and the presence or absence of the reproduction envelope of the first field is judged by detecting the output level of the envelope detection circuit 22 (step 7-4). If there is no envelope, the process proceeds to step 7-16, and if there is, it is judged by the reproduction mode switch 16 whether or not the frame is reproduced. In the case of field reproduction, it is possible to reproduce the image by confirming that the first field has an envelope.
If it is a frame reproduction, the presence or absence of the reproduction envelope of the second field is checked to see if the reproduction of the other field can be performed (step 7-6). ste
If there is no reproduction envelope in p7-4 and 7-6, there is no image to be transmitted, so the flow branches to step 7-16 and transmission is prohibited. On the other hand, if there is an image to be transmitted, st
ep7-7 Enter the routine below and move to the transmission operation.

In step 7-7, the parameters required to start transmission are initialized. Specifically, the variables Z and Y indicating the transmission line shown in FIG. 3 and the variable X indicating the horizontal dot position are cleared. In addition, transmission mode switch 15, playback mode switch 16, and playback process circuit 23
The transmission mode actually executed at the time of transmission by the color / monochrome signal obtained from
The final line NO.YE of the screen and the number of times the transmission sequence shown in FIG. 3 is repeated, that is, the number N is determined as shown in Table 1.

Here, even if the reproduction signal is monochrome, if the transmission mode switch 15 is set to color mode, the same information will be sent multiple times. Therefore, in this embodiment, the actual transmission mode is changed to monochrome. Avoid waste as field mode. Therefore, the optimum transmission mode can be selected according to the nature of the image.

With setp7-7, the variable TXPBNO which is the transmission track NO.
The value of PBTRNO which is the reproduction track NO is substituted into.

When the initialization of the transmission parameters is performed in this manner, the power supplies AD PWR of the A / D converters 24 and 25 and the power supply MEM PER of the memory unit are turned on (steps 7-8). Then, the memory freeze operation is performed according to Table 2. The memory circuit shown in FIG. 2 has two field memories.
It is shown in the table below as M ₀ and M ₁ .

Here, Y _1st is the Y signal of the first field, Y _2nd is the Y signal of the second field, and (RY) _1st / (BY) _1st is the first field.
Represents a field color difference line sequential signal.

Figure 20 shows the color field mode (2COLOR / 3COLOR)
21 schematically shows the freeze state in the monochrome frame mode, and the Y suffix shows the line NO. Further, in the monochrome field and monochrome frame mode, only the memory MO shown in FIG. 21 is frozen.

When the playback signal is frozen in the memory as described above, A / D
Power supply AD PWR for converters 24 and 25 and power supply DECK PW for the detector
R is turned off (steps 7-10), and then the dropout pulse supplied from the regeneration process circuit 23 to the memory control circuit 27.
Dropout compensation is performed based on DOP (step 7-1
1). A specific method of compensation in the present embodiment may be based on, for example, pre-interpolation, but as another method, for example, the method shown in Japanese Patent Application No. 62-19463 already proposed by the present applicant can be used. Just take it.

When the dropout compensation is completed, the power of the transmission control circuit 35 is turned on.
The TX PWR is turned on (steps 7-12), and the flag TX FLG indicating that transmission is in progress is set (steps 7-13). Furthermore, since it entered the transmission mode, LP TIM is preset (st
ep7-14), the interrupt request mask IRQMSK is cleared to start the transmission interrupt routine shown in FIG. 8 (step 7-15).

If it is determined in step 7-1 that TX FLG is "1", that is, the transmission is in progress, it is checked whether or not the transmission stop switch 8 is pressed (step 7-17). If not, step 7-22
OFF TIM in order to turn off the power after a predetermined time so that the power does not turn off immediately after the transmission ends
To preset.

As a result, the power is not turned off immediately after the transmission operation is completed, which is convenient for the user to immediately perform the next operation.

When it is detected in step 7-17 that the transmission stop switch 8 has been pressed, IRQMSK is set so that the transmission interrupt routine does not start (steps 7-18) and the transmission flag TX is set.
Clear FLG (steps 7-19) and turn off TX PWR and MEM PWR (steps 7-20) to turn off the power supply of the transmission circuit unit and the memory circuit unit. With this, unnecessary power consumption can be suppressed as much as possible. Next, all the LEDs 10 to 12 indicating the progress of the transmission sequence are turned off (step7-2
1) As in the case where the transmission stop switch 8 is not pressed, the OFF TIM is preset (steps 7-22).

Next, the transmission process by the interrupt process will be described with reference to FIG. FIG. 8 illustrates the transmission interrupt routine. After starting transmission, when Z = 0 (step 8-1) as described in FIG. 3, the transmission mode, etc.
Transmission data D (X, Y) is determined according to a code including parameters required for reception (step 8-26). This concrete data may be 3-bit data corresponding to the eight transmission procedures shown in Table 1.

Next, when Z is 1 to 3 (step8-2), since it is the synchronizing part, the phase LED 10 is turned on (step8-35), and then 0≤ by the address X in the horizontal direction (step8-27). X ≦ 4
Transmission data to "FF", that is, the highest white level (setp8-
28) If 4 <X, set to “00”, that is, black level (s
tep8-29).

When Z is 4 or 5 (step 8-3), since it is the reference white level portion, the transmission data D (X, Y) is set to "FF" (step
8-30). At the same time, turn off the Phase 10 LED, white
The LED 11 is controlled to turn on (step 8-33). When Z = 6 (step8-4), since it is the first 1H of the data start detection unit, it is "00", that is, the black level (step8-31), and when Z = 7 (step8-5), the next Since it is 1H, it is set to "FF", that is, the white level (step 8-32). In the case of Z = 8, that is, in the case of the image part, after turning off the white LED 11, the data LED 12 is controlled to be turned on (step 8-34), and each routine (step 8-7) is performed according to the actual transmission mode determined in Table 1. To 8-11) (step 8-6).

FIG. 9 is a monochrome field-drum of step 8-7. In this mode, as shown in Table 2, memory
Since the image data only M ₀ are stored, after setting as read the memory M ₀ (step9-1), address (X, Y) data D (X, Y) of the accessing (STEP9-2) .

FIG. 10 shows the monochrome frame routine of step 8-8. As this mode is also shown in black and white field at the same Table 2, since the image data only to the memory M ₀ is stored, after setting the memory M ₀ (step10-1), vertical line NO is odd or even number (Step 10-2), if it is an even line, the memory data D (X, Y / 2) is directly read (ste
p10-3), memory data D (X, (Y-1) / 2) and D (X, (Y + 1)) for line interpolation if odd lines
/ 2), that is, the average value of the upper and lower lines is calculated (step10-
4).

FIG. 11 shows a monochrome frame mode routine of step 8-9. In this mode, as shown in Table 2, memories M ₀ , M
_{Since one} field is stored in each 1 field, it is determined whether the vertical line NO is an even line or an odd line (step 11-
1) If it is an even line, set the memory M ₀ to read the data on the first field side (step 11-2) and access the data D (X, Y / 2) at the address (X, Y / 2). Yes (step11
-3). If it is an odd field in step 11-1, the memory M ₁ is set to read the data on the second field side (step
11-4), data (X, Y-1) / 2) of data D (X,
Access (Y-1) / 2) (step 11-5).

FIG. 12 shows the two-color mode routine of step 8-10 shown in FIG. 8, and FIG. 17 schematically shows the form of data actually transmitted in the two-color mode. (A) is a first color, which is a Y signal of horizontal 640 pixels and vertical 256 lines. (B) is the second color, which is 1 in the horizontal direction for 320 horizontal pixels.
The (RY) signal and the (BY) signal scattered at every pixel are simultaneously transmitted within one line. Fractions in the figure indicate that pixels are scattered every other pixel, and (') indicates that nonexistent lines are interpolated by the average value of the upper and lower lines.

In FIG. 12, step 12-1, the variable N indicating the color is 2, which is the Y signal when the color is the first color, so the memory M ₀ is set (st
ep12-2), and the data D (X, Y) at the address (X, Y) is accessed (step 12-3).

If N is 1 in step 12-1, that is, the second color, the memory M ₁
After setting (step12-4), the current line becomes (R-
It is judged whether it is the (Y) line or the (BY) line (step 12-
5) If it is the (RY) line, it is checked whether the transmission address X in the horizontal direction is (XE-1) / 2 or less, that is, within the first half 320 pixels (step 12-6). Find the upper address (2 * X, Y) and use that data (D
Access (2 * X, Y) (step 12-7). In this embodiment, "*" indicates multiplication. In step12-6, in other cases, that is, in the latter half 320 pixels, it does not exist (B-
Y) The actual memory address (2 * {X- (XE-1) /
2}, Y-1) and (2 * {X- (XE-1) / 2}, Y + 1) color difference signals are accessed, and the average value of both is calculated (step
12-8).

If the current line is the (BY) line in step 12-5, X is (XE-1) / 2 or less in step 12-9, that is, the first half 32
In the case of 0 pixel, there is no (RY) data that does not exist, so the average value of the memory data at the actual addresses (2 * X, Y) and (2 * X, Y + 1) is calculated (step 12-10). . step
12-9, otherwise memory address (2 * {X-
(XE-1) / 2}, Y data is accessed (step12-1
1).

FIG. 13 shows the routine in the 3-color mode in detail. First, a memory to obtain the Y signal data of the current line
Access D (X, Y) of M ₀ and store the result in variable A (step 13-1).

Next, according to the value of N, as shown in FIG. 18, R, G and B are sequentially transmitted in the frame order (step 13-2).

In the case of N = 3, that is, the R signal, it is judged whether the current line is the (RY) line or the (BY) line according to the color difference signal level in the memory (step 13-3), and if it is the (RY) line. Memory
Read D (X, Y) directly from M ₁ (step 13-4),
If it is the (BY) line, in order to interpolate from the upper and lower lines, D (X, Y-1) and D (X, Y + 1) of the memory M ₁ are read out,
The average value of these is calculated (step 13-5). step13-4
And the result of step13-5 is stored in variable B, and next step13-
The variables A and B are added in 6 to obtain the R signal.

If N = 2 in step 13-2, that is, if it is a G signal, it is similarly determined whether the current line is the (R-7) line or the (BY) line (step 13-7), and the (R-7) line In this case, the data at the address (X, Y) of the memory M ₁ is read and stored as the (RY) data in the variable B (step 13-8), and the (BY) data is the upper and lower line data D of the memory M _1. (X, Y-1) and D
The average value with (X, Y + 1) is calculated and stored in the variable C as (BY) data (step 13-9). If the current line is the (BY) line in step 13-7, the average value of the data D (X, Y−1) and D (X, Y + 1) of the upper and lower lines of the memory M ₁ is calculated, and (R− Y) Store as line data in variable B (step 13-10). The (BY) data is stored in the memory M ₁
(Step 13-11). From A, B, C, that is, Y, (RY) data obtained in this way, Y = 0.59G + 0.30R + 0.11B ∴G = (Y-0.30R-0.11B) /0.59= {0.59 * Y-0.30 * (R -Y) -0.11 * (BY)} / 0.59 = (0.59 * A-0.30 * B-0.11 * C) /0.59 is calculated (steps 13-12).

In the case of N = 1 in step 13-2, that is, in the case of B signal, step 13-3
Up to step 13-6 can be obtained by exactly the same method as when obtaining the R signal (step 13-13 to step 13-16).

As described above, the transmission data D (X, Y) obtained in steps 8-1 to 8-11 in FIG. 8 is supplied from the system control circuit 39 to the transmission control circuit 35 (step 8-12). Then, the horizontal address X of the transmission is incremented (step8-1
3) If this is less than the final dot address XE (step8-
14) End the routine and clear X if XE is exceeded (st
ep8-15), Z, that is, whether the vertical counter value other than the video portion is smaller than 8 or not, that is, whether or not it is in the video portion (step 8-16), Z is incremented when it is not the video portion. (Step8-17), if it is a video part, increment the vertical counter-Y (step8-1).
8), it is checked whether or not the result exceeds the final vertical line NO.YE (step 8-19). If it does not exceed the vertical line NO.YE, the routine ends. If not, the image data for one image is ended. Therefore, clear the vertical line NO.Y (step8
-20), decrement the variable N representing the number of sheets (step
8-21). If N is not 0 (step 8-22), the transmission of the next screen is started from the beginning, so Z = 1 is substituted and the routine is finished (step 8-25). This is because the second and subsequent sheets start from the synchronization signal section shown in FIG. st
When N = 0 in ep8-22, it means that the transmission of all has been completed, so the transmission flag TX FLG is cleared (step8
-23), IRQMSK is set to stop the transmission interrupt (steps 8-24).

<Kiraactor Routine> Next, the killer actor routine shown in step 5-6 of FIG. 5 will be described with reference to FIG.

In this routine, it is checked whether the power supply state of the reproduction process unit, that is, whether the video floppy is in the reproduction state (step14
-1) If it is off, the character display is controlled not to be displayed. In this embodiment, the character is displayed on the monitor 1 together with the reproduced image as described above.
The present invention is not limited to this, and control may be performed so that only the character is displayed without displaying the reproduced image. In this case
If PB PWR is off, only the track number being transmitted is displayed. If PB PWR is on in step 14-1, it is detected whether DISP switch 5 is pressed (step 14-2). If not, step 14-8
If the switch is pressed, OFF TIM is preset (step14-3), and then it is checked whether or not transmission is in progress (step14-
4). When it is not being transmitted, that is, in the simple reproduction mode, the character display state variable DISP STS is incremented by the modulo 2 (step 14-5). If it is during transmission, after the transmission is started, it is checked whether or not the jacket has been taken out even once (step 14-9). If it has not been issued, the process branches to steps 14-6 and below. The previously set transmission track NO.TXTRNO is made into a meaningless symbol "-" (step 14-10). This is the track on the jacket that TXTRON was installed at the start of transmission.
Since it is NO, there is no guarantee that once the jacket is taken out, the next inserted jacket is the same as the one before being taken out.

Therefore, by executing steps 14-9 and 14-10, the displayed track NO.TXTRNO, that is, the image recorded in which track of the jacket in which the image to be transmitted is inserted in the device is displayed. You can know exactly if there is. DISPSTS is incremented by module 3 (step14-6), and LP TIM is preset (step14).
-7). In step14-8, character display is performed according to DISP STS. FIG. 15 shows the monitor 1 shown in FIG.
It is a diagram schematically showing the character display performed above. (A) is a mode in which DISCHAR STS = 0, in which the character is not displayed, and only the image is reproduced as a visible image on the monitor 1. (B) is the case of DISP STS = 1, and is an example of the case where the reproduction track NO is displayed. (C) is an example of the case where DISP STS = 2 and the transmission track NO is displayed. The contents displayed in step 14-8 are specifically determined as shown in Table 3.

Here, XX is PBTRNO inserted in 2 digits, and △△ is TXTRNO.
Is displayed in 2 digits. And TX △△ (▲ ^R _B ▼) is 1
There are two colors on the screen, so with a fixed period (for example, 0.
5Hz) R and B are displayed alternately. In the present embodiment, the above-described display is performed as an example, but the present invention is not limited to this, and various modified displays are possible.

<Power Control Routine> Next, the power control routine of step 5-7 in FIG. 5 will be described with reference to FIG.

First, check the TX FLG value to determine whether it is in transmission (step
16-1), if it is not being transmitted, go to step 16-1 and below, and if it is being transmitted, it is detected whether or not the video floppy is attached (step 16-2). If not installed, step16
Branch to -11 or lower. If it is detected in step 16-2 that there is floppy, it means that reproduction and transmission are being performed at the same time. Therefore, the value of LP TIM is checked to stop the display on the monitor 1 (step 16-3). If the value is not 0, the reproduction process section, the disk section, etc. must keep the power-on state, so after the LP TIM is decremented (step 16-8), the process branches to step 16-10. On the other hand, if LP TIM is 0 in step 16-3, it is a low power consumption mode, so a switch related to reproduction system control for returning from this mode, that is, a track up switch 3,
The order of whether or not the track down switch 4 and the displace switch 5 are pressed is detected (steps 16-4 to st
ep16-6). If none of them is pressed, the power supply for the playback process section, the deck section, and the monitor section PB PWR, DECK PWR, MONI
Turn off PWR respectively (step 16-7). Also, step16-4
~ If any of the buttons is detected in step16-6, LPTIM is preset (step16-9) and then PB PW
Turn on the power of R, DECK PWR, MONIPWR, respectively (step16
-10).

When the above-mentioned routine for the low power consumption mode is completed, step 16-11, which is a routine for turning off the power source of the apparatus in a fixed time from the final operation, is entered. If OFF TIM is determined to be 0 here, the system control circuit 39 controls the power supply circuit 30 to turn off all the power supplies to each circuit section, and also turns off SYS PWR (steps 16-13). . step16-1
If 1 and OFF TIM is not 0, then OFF TIM is due to the OFF TIM clock.
Is decremented (step 16-12).

By executing the above flow, it is possible to eliminate the power consumption of the part that is not necessary for the operation and achieve the low power consumption.

Further, according to this embodiment, in the low power consumption mode, by turning on the switch for normal track UP / DOWN, the power of the reproducing section and the monitor section is automatically turned on, which is convenient. In addition, the power of the reproducing unit and the monitor unit is automatically turned on only by operating the switch for display shown in FIG. 15, so that there is an effect that it is easy to use.

[Other Examples]

As described above, in the present embodiment, the Y signal and the color difference signal of the time division line are used simultaneously in the two-color mode as shown in FIG. 17, but the present invention is not limited to this, and the G signal and the time division line are shown in FIG. R / B
Good as a signal.

Further, in the present embodiment, the transmission signal is a synchronization signal part for a fixed time,
It is assumed that the reference white level part precedes, and the transmitting side operates unilaterally, but when the synchronization signal part is detected by the receiving side, an answer signal is returned, the transmitting side detects it and proceeds to the next reference white part. It goes without saying that the present invention can be applied to a system, and in this case, the low power consumption mode may be controlled after entering the video section.

In the embodiment described above, when the frame reproduction mode is set, a means for discriminating that at least one field is missing is shown in FIG.
The controller was used to execute steps 4 to 7-6. Also,
If one field is missing due to this determination,
The controller that executes steps 7-16 was used as the means for prohibiting communication operations.

The present invention is not limited to the software configuration as described above, and it goes without saying that it may have a hardware configuration.

〔The invention's effect〕

As described above, according to the present invention, the reproduction image and the transmission mode can be identified, and even if the reproduction image is a monochrome image, the transmission mode is changed to the monochrome transmission mode even if the color image transmission mode is erroneously specified. Since it is changed automatically, transmission of image signals corresponding to color components can be prevented, waste is eliminated in terms of time and cost, and even if a black-and-white image is received, the color is affected by noise or the like. It is possible to prevent the reproduction of an image having only a certain feature and reproduce the image faithfully. Further, since the reproduced image signal is displayed in a distinguishable manner whether it is a color image signal or a monochrome image signal, and the transmission mode is also displayed in a distinguishable manner whether it is the color image transmission mode or the monochrome image transmission mode, Even if the transmission mode specified by the user is changed by the device,
Since the user can recognize the change of the transmission mode and the cause thereof, even if the color transmission mode is selected, the transmission time is required for the color transmission due to the change of the transmission mode to the monochrome image transmission mode. Since the time is remarkably shortened, anxiety is not given to the user, and the operability is improved.

[Brief description of drawings]

FIG. 1 is a front panel view of the present embodiment, FIG. 2 is an overall system configuration diagram of the present embodiment, FIGS. 3 and 4 are diagrams for explaining a transmission form of the present embodiment, and FIG. ~ FIG. 16 is a diagram for explaining the operation flow of the present embodiment, FIGS. 17 to 19 are diagrams for explaining the transmission sequence of the present embodiment, and FIGS. 20 and 21 are image signals. FIG. 22 is a block diagram showing the configuration of the power supply circuit 30 shown in FIG. 1 for explaining the memory storage. 5 …… Displace switch 23 …… Reproduction process circuit 26 …… Memory circuit 27 …… Memory control circuit 39 …… System control circuit

Claims (1)

[Claims] 1. Playing back an image signal stored in a recording medium,
An image communication method for communicating a reproduced image signal, wherein a desired transmission mode is designated from a plurality of transmission modes including at least a color image transmission mode and a monochrome image transmission mode as a transmission mode of the image signal to be communicated, The transmission mode is changed to a monochrome image transmission mode on condition that the designated transmission mode is not the monochrome image transmission mode and the reproduced image signal is a monochrome image signal, and the reproduced image signal is a color image signal. The image communication method is characterized in that whether it is a monochrome image signal or a monochrome image signal is displayed in a distinguishable manner, and whether the transmission mode is a color image transmission mode or a monochrome image mode is displayed in a distinguishable manner.