JP2675407B2 - Still image transmission device and system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a still image transmission system capable of transmitting a color still image through a communication line and printing an image received through the communication line with a color printer. The present invention relates to an image transmission device and a still image transmission system using the same.

[Prior Art] As described in JP-A-62-271588, a conventional still image transmission apparatus performs transmission with little distortion. Therefore, a composite color image signal is encoded for each color signal, The color sequential signal is transmitted to the receiving side, and the receiving side reproduces the composite color image signal again. When the received color image is printed out on the color printer (hereinafter referred to as "printing"), the color printer is connected to the still image transmission device and printing is performed using the received and reproduced color image signal. Was there.

[Problems to be Solved by the Invention] In the above-described conventional technique, since the color printer uses the color image signal reproduced on the receiving side to print, the printing cannot be started until all the image data is received. Therefore, for example, when it takes 1 minute to transmit an image and 2 minutes to print, there is a problem that it takes 3 minutes or more to transmit and print.

Further, the above conventional technique has a problem that the next image cannot be transmitted during printing when the printer does not have an image memory.

Therefore, it is an object of the present invention to solve the above problems and provide a still image transmission device and a still image transmission system that enable printing while transmitting image data.

[Means for Solving the Problems] In order to achieve the above object, a still image transmission capable of transmitting a color still image through a communication line and printing an image received through the communication line by a color printer. In the apparatus, the present invention provides a signal converting unit for converting an input image signal into image data corresponding to a plurality of color components printed by the color printer, and the image data converted by the signal converting unit, The printer is characterized by comprising a transmission control means for transmitting in accordance with the color order of printing by the printer and a printing control means for printing by the color printer while receiving image data from the communication line.

Further, according to the present invention, transmission control means for transmitting an input image signal in a color order corresponding to a color order printed by the color printer, and image data from the communication line are received, and the image data is transmitted to the color printer. The image forming apparatus may be provided with signal converting means for converting into image data of color components to be printed by a printer, and printing control means for printing the image data converted by the signal converting means with the color printer.

 Further, the present invention can have the following configurations.

a. signal conversion means for converting an input image signal into image data corresponding to a plurality of color components printed by the color printer, and the image data converted by the signal conversion means in the scanning direction of the color printer. A transmission control means for transmitting one line at a time in total and a print control means for causing the color printer to print each time one line of image data is received from the communication line can be configured.

b. Transmission control means for transmitting the input image signal as a color sequence corresponding to the color sequence for printing by the color printer, one line at a time in accordance with the scanning direction of the color printer, and the image signal from the communication line. And a signal converting means for converting the image data converted by the color printer into image data of color components to be printed by the color printer, and printing the image data converted by the signal converting means for each line by the color printer. And a control means.

c. Signal conversion means for converting the input image signal into image data corresponding to a plurality of color components printed by the color printer, and each color component of the image data converted by the signal conversion means, Transmission control means for transmitting one line at a time in accordance with the scanning direction, and printing control means for causing the color printer to print each time one line of each color component of the image data is received from the communication line. It can be configured.

d. Transmission control means for transmitting one line of each color component in accordance with the scanning direction of the color printer, using the input image signal as a color component corresponding to the color component printed by the color printer, and the communication line. Receive the image signal from
The signal converting means for converting this into image data of color components to be printed by the color printer, and the image data converted by the signal converting means every time one line of all color components is received, the color printer It can be configured by including a printing control means for printing.

The present invention is to construct a still image transmission system including a transmitting side and a receiving side, by which a color still image can be transmitted using a communication line and the receiving side can print the received image with a color printer. You can

That is, according to the present invention, a means for transmitting image data composed of a plurality of color components in a transmission unit that can be printed by the color printer on the receiving side, and reception of the next image data each time this transmission unit is received. There is provided a still image transmission system including a means for performing printing in parallel.

The transmission unit may be one line in the scanning direction printed by the color printer. The transmission unit may be one line in the scanning direction printed by the color printer for each color component forming the image data. The latter is suitable for a printer that prints three colors simultaneously.

The still image transmission device and the still image transmission system of the present invention detect the transmission error and make a resend request, and when a resend request is made, print the image after the data is corrected by resending. And means for controlling to start.

[Operation] By connecting the still image transmission device of the present invention to a communication line, a color still image can be transmitted through the communication line and an image received through the communication line can be printed by a color printer. . According to such a configuration,
Each still image transmission device can transmit and receive still images. That is, the color printer on the receiving side transmits image data composed of a plurality of color components in a transmission unit capable of printing, and every time this transmission unit is received, printing is performed in parallel with the reception of the next image data. be able to.

If the transmission is in only one direction, it is not necessary to have both the transmission function and the reception function, and it is sufficient to have one of the functions.

In the present invention, in order to send the image data to the receiving side via the communication line, the input image signal is converted into the image data corresponding to the plurality of color components printed by the color printer by the signal converting means, and the image data is transmitted. The control means transmits the image data converted by the signal conversion means in accordance with the color order to be printed by the color printer.

On the other hand, at the time of reception, the printing control means causes the color printer to print while receiving the image data from the communication line.

The conversion may be performed at the time of reception instead of being performed at the time of transmission.

The image data can be transmitted, for example, in the order of Y color data, M color data, and C color data in component color units. Then, after the transmission of each color data is completed, printing of the color data is started.

It is also possible to further subdivide the color data so that the color data is transmitted for each line of the printing scan of the printer, and the color data is printed for each line of the image. Furthermore, in the case of a printer that prints three colors simultaneously,
It is also possible to transmit image data for each one line of Y color data, M color data, and C color data, and print each time one line of data for three colors is transmitted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a still image transmission apparatus according to the present invention.

In the figure, 101 is a transmitter and 102 is a receiver.
Here, for the sake of explanation, the receiving device 101 and the transmitting device 102 are shown separately, but an actual still image transmitting device is often used for both transmission and reception.

103 is a video signal input terminal, 104 is a video signal R
A decoder that decodes component signals such as (red), G (green), and B (blue), 105 is an A / D converter, 106 is an image memory that stores a video signal, and 107 is an important element in this embodiment. An image memory that constitutes one signal conversion means
It is a signal conversion circuit that converts the signal read from 106 into a color signal to be transmitted. In this embodiment, the signal conversion circuit 10
7, for example, Y (yellow), M (magenta),
It is converted into each color signal of C (cyan).

Reference numeral 108 denotes an encoding circuit that encodes the converted color signal, and also performs data compression in some cases. Reference numeral 109 is a transmission circuit that transmits data according to the communication line 110, and includes a so-called modem (modulator / demodulator) when the communication line 110 is an analog general telephone line. 110 is a communication line such as a telephone line.

111 is a D / A converter, 112 is an encoder that encodes component video signals into composite video signals, etc.,
Reference numeral 113 is a video output terminal.

Reference numeral 114 is a system control circuit that controls the whole and also functions as a transmission control means.

Reference numeral 115 is a receiving circuit for receiving the signal sent by the communication line 110, and also includes a demodulator when the received signal is a modulated signal. Reference numeral 116 is a decoding circuit that decodes the signal that has been encoded and sent, and if data compression has been performed, data decompression is also performed here.

117 is an image memory for storing the color signal data of Y, M, C, etc. obtained in this way, and 118 is a printer I / F for controlling the sending of the data in the image memory 117 to the color printer 119.
(Interface) 119 is a printer for full-color printing.

120 receives the data received and stored in the image memory 117 as R, G,
A signal conversion circuit for converting to a signal such as B, 121 is a D / A converter, 1
Reference numeral 22 is an encoder, and 123 is a video output terminal for outputting a video signal of a received video.

Reference numeral 124 is a system control circuit that controls the whole and also functions as a printing control means.

Next, the operation of the embodiment shown in FIG. 1 will be described in detail.

Prior to that, first, the printing operation of the printer 119 will be briefly described.

As shown in FIG. 2, a full-color printer normally prints Y (yellow), M (magenta), and C (cyan) colors to reproduce full colors. And, in many cases, it prints in the order of Y, M, C. Further, the printing direction can be roughly classified into two. One is a type that prints from top to bottom as shown in Fig. 2 (1) (there is an arrow in the horizontal direction in the figure, but in reality, one horizontal line is often printed at a time), another type One is a type of printing from left to right as shown in (2) (often printing one vertical line at a time).

On the other hand, since a still image transmission apparatus compresses data and transmits the data in the shortest possible time, it is often transmitted in the form of component signals that can improve compression efficiency, for example, luminance and color difference signals.

Therefore, when the image transmitted in this way is printed by a printer, it is not possible to print while transmitting, and there is no choice but to print after sending one screen of data.
That is, conventionally, as shown in FIG. 3A, the time from the start of transmission to the end of printing is (transmission time + printing time). By printing while printing, the printing is completed within (printing time + α).

FIG. 4 shows a communication procedure of the still image transmission apparatus according to the present embodiment and a state of printing.

In the figure, 401 indicates a pre-procedure for confirming communication conditions between transmitting and receiving devices, 402 indicates transmission of Y color data, and 4 indicates
Reference numeral 03 indicates a time point T ₁ when the Y-color data for one screen is received, at which the Y-color printing starts.

Reference numeral 404 indicates transmission of M color data, and 405 indicates a time point T ₂ at which the M color data for one screen is received. At this point, printing of M color is started. Reference numeral 406 denotes transmission of C color data, and at time T ₃ when the C color data for one screen of 407 is received, printing of C color is started.

408 is a post-procedure for confirming the transmission of all data and the end of communication.

The operation of the embodiment shown in FIG. 1 will be described with reference to FIG.

First, a video signal to be transmitted is input to the video input terminal 103, decoded by the decoder 104 into R, G, B signals, and then these signals are stored in the image memory 106 via the A / D converter 105. The stored image is stored in the A / D converter 111 and the encoder 11
Since the signal is output to the video signal output terminal 113 via 2, it can be confirmed by connecting a monitor TV (not shown) or the like here.

In the case of transmission, first, the communication of the pre-procedure 401 is performed between the transmission device 101 and the reception device 102 to establish communication. Next, the signal conversion circuit 107 first converts the R, G, B data stored in the image memory 106 into Y data,
The data is transmitted to the communication line 110 via the encoding circuit 108 and the transmission circuit 109 (402).

In the receiving device 102, the Y data is transmitted by the receiving circuit 115, then decoded by the decoding circuit 116 and stored in the image memory 117. When the Y data for one screen is stored, the Y data is sent to the printer 119 via the printer I / F 118 to start printing the Y color (403).

Then, the signal conversion circuit 107 converts the data in the image memory 106 into M data and transmits it as described above (40
Four). In the same manner, the receiving device 102 receiving this stores the M data in the image memory 117 and then transfers it to the printer 119 to print the M color (405). The same applies to C data.

When all the C data is transmitted, the post-procedure 408 is performed.
Communication is performed and the communication ends.

The data received and stored in the image memory 117 is converted into R, G, B data by the signal conversion circuit 120,
A video signal is output via the D / A converter 121 and encoder 122 and output to the output terminal 123.
The reception image can be confirmed by connecting (not shown) or the like.

In FIG. 4, Y color printing is started at T ₁ of 403, and M data transmission 404 is performed thereafter.
This may start transmission of M data 404 and then start printing of Y color.

Further, the printing of M color is started at time 405 of T ₂ when the transmission 404 of M data is finished. However, if the printing of Y color is not finished by this time, the transmission 406 of C data is preceded. May start at.

Next, FIG. 5 shows an example of a communication procedure when there is a data transmission error on the communication line 110. However, in the following, the pre-procedure and the post-procedure are omitted.

In this example, a transmission error is corrected by retransmission. In addition, in FIG. 5, the same reference numerals as those in FIG.
The same procedure is shown. Data is transmitted in packet units of appropriate length.

First, Y data is transmitted (402). If an error occurs in the Y data packet, after the transmission of all the Y data packets, the retransmission request 501 is sent to retransmit the packet in error.
, And only the packet is retransmitted 502.
Resending request 501 and resending 502 are repeated until there is no transmission error, and after the end, printing of Y color is started (403). M data and C data resend requests 503 and 50
5. The same applies to retransmissions 504 and 506.

The embodiment shown in FIGS. 4 and 5 is a system in which printing is started after all data for one screen is transmitted.
In this case, the time α in FIG. 3 (2) is one screen transmission time of Y data.

Next, another embodiment in which the procedure of transmission and printing is different in the present invention will be described with reference to FIGS. 6 and 7.

In this embodiment, in order to further shorten the above-mentioned time α, the printer prints in horizontal or vertical line units, and data transmission is performed in the same direction as the printer prints. One line, or
In this example, printing is performed every time data of several lines is transmitted.

 This example is carried out using the apparatus shown in FIG.

Here, as shown in FIG. 6, the image memory 106 is configured to have an address (shown in hexadecimal) corresponding to each pixel of the screen composed of 512 horizontal pixels and 480 vertical pixels. As the printer, as shown in FIG. 2 (1), a printer that prints from the top to the bottom of each horizontal line is used. Further, the system control circuit 114 is configured so that the image memory 1
It has a function of reading image data from 06 in accordance with the scanning direction of the printer 119 and performing control so as to transmit image data in accordance with the scanning direction.

On the transmitting device 101 side of this embodiment, the system control circuit 114
Under the control of, the signal conversion circuit 107 reads out data for one horizontal line (data at addresses 0 to 1FF in FIG. 6) from the image memory 106, converts this to Y data, encodes and transmits. Yes (701).

The receiving device 102 receives the data for one line, or
At the time T _y 1 when data of several lines is received, one line of Y color is printed (702).

Thereafter, in the same manner, printing is performed every time one line of data transmitted from the transmitting device 101 is received. The same applies to M color and C color.

In the description of the embodiment shown in FIG. 7, the printer prints from the top to the bottom for each horizontal line as shown in FIG. This embodiment can also be applied to the case where the printer prints from left to right for each vertical line, as shown in FIG.

In this case, first, the data of one vertical line in FIG. 6, for example, the data corresponding to the addresses 0, 200, ... 3BC00, 3BE00 is transmitted, and when this is received, one line is printed. The rest is the same as the description of FIG. 7.

The above embodiment is a suitable example when a printer that prints each color one screen at a time, that is, so-called frame sequential printing is used.

Next, an embodiment in which a printer that prints each color line by line, that is, a printer that prints in a so-called line-sequential manner, or a printer that prints three colors simultaneously is used will be described with reference to FIG.

That is, image data is transmitted line by line in accordance with the scanning direction in which printing is performed (801 to 803), and printing is performed line by line every time it is received (804).

In the case of a printer that prints three colors simultaneously,
Even if the sender does not need to convert the data corresponding to each color before sending it, the sender converts the data into a form with the highest transmission efficiency (for example, luminance and color difference signal data), and the receiver receives data corresponding to each color. You may print while converting to.

Next, specific examples of the pre-procedure 401 and the post-procedure 408 in FIG. 4 will be described.

FIG. 9 shows an example of the pre-procedure 401, and (1) uses the procedure of the G III facsimile (facsimile group type 3 recommended communication method).

In the figure, reference numeral 901 denotes a digital identification signal (DIS), which informs the transmitting device of the communication method and function adopted by the receiving device. Reference numeral 902 denotes a digital command signal (DCS) which instructs the receiving device about a communication method to be executed. 903 is a training check signal (TCF) that checks the reception status on the reception side including the line status. A reception preparation confirmation signal (CFR) 903 notifies that the TCF is normally performed and the transmission of image data may be started.

In the case of this still image transmission device, if the DIS901 and DCS902 can be used to check various printer performances (printing color order, printing direction, number of pixels, printing speed, etc.) during transmission and reception, different types will be obtained. It can also support a printer.

When the printer performance and line status are fixed in advance, a simple procedure as shown in FIG. 9 (2) may be used. That is, the transmission device notifies the transmission confirmation signal 905 for starting transmission, the reception device confirms the transmission confirmation signal 905, sends the reception confirmation signal 906, and then transmits / receives image data.

FIG. 10 shows a procedure showing an example of the post-procedure 408,
(1) shows the procedure using the G III facsimile procedure (fax group 3 type recommended communication method).

In the figure, 1001 is a procedure end signal (EOP), which indicates the end of transmission of image data for one screen. A message confirmation signal (MCF) 1002 indicates that image data has been correctly received. A line disconnection command (DCN) 1003 indicates that the communication is terminated and the line is disconnected.

This post-procedure may be another procedure, for example, only the reception end signal 1004 as shown in FIG. 10 (2).

Next, another embodiment of the present invention will be described with reference to FIG.

The embodiment shown in FIG. 11 includes a decoder 104, a signal conversion circuit 1101, an A / D converter 105, an image memory 106, an encoding circuit 108, a transmission circuit 109, and a D / A converter 111. The transmitter 101 includes a signal conversion circuit 1102, an encoder 112, and a system controller 114.

This transmitting device 101 includes a receiving device 10 via a communication line 110.
Connected with 2.

The same components as those of the embodiment shown in FIG. 1 described above are designated by the same reference numerals, and the duplicated description will be omitted.

In the embodiment shown in FIG. 1 described above, while each of the R, G, and B data is stored in the image memory 106 of the transmission device 101,
The image memory 117 of the receiving device 102 stores Y, M, and C data. Therefore, in the present embodiment shown in FIG. 11, each image memory stores Y, M, and C data.

In the figure, 1101 is decoded by the decoder 104,
For example, it is a signal conversion circuit that performs complementary color conversion of R, G, B signals into Y, M, C signals. Conversely, 1102 is a signal conversion circuit that converts Y, M, C signals into R, G, B signals and the like. In FIG. 11, the signal conversion circuits 1101 and 1102 are shown to perform analog signal processing, respectively. However, if these are configured to perform signal conversion after the A / D converter 105 and before the D / A converter 111, signal conversion by digital processing is possible.

Next, still another embodiment of the still image transmitting apparatus according to the present invention will be described with reference to FIG.

In the figure, 1201 is a communication line such as a telephone line.
1202 is a network control unit (NCU: Network Control Unit) that controls the connection between the communication line 1201 and the still image transmission device, and 1203 is a modulator / demodulator (modem) that performs modulation / demodulation for transmission / reception via the data communication line 1201. 1204 is a communication control circuit for performing communication control. 1205 is a digital signal processor (DSP) that performs high-speed orthogonal transformation (for example, discrete cosine transformation) to compress data, and 1206 is a CPU 1215 that controls the entire system.
The system memory is composed of a ROM (read-only memory) for storing the system program and a RAM (random access memory) used for a work area.

Further, 1207 is a video signal input terminal, 1208 is a video input processing circuit which decodes the input video signal and converts it into digital color data for printing, and 1209 stores the video data to be transmitted or the received video data. An image memory, 1210 is a video output processing circuit for converting data and encoding for monitoring the video in the image memory 1209, and 1211 is its video output terminal.

Further, 1212 is a printer I / F (interface) that controls connection with the printer unit 1213, and 1213 is a printer unit that prints a received image or the like.

Reference numeral 1214 is a system bus including a data bus and address bus, 1215 is a central processing unit (CPU) that controls the entire system, and 1216 is an operation unit that operates the apparatus by various switches.

The operation of this embodiment will be described with reference to the flowcharts of FIGS. 13 and 14.

FIG. 13 shows a processing flow on the transmission side of the still image transmission apparatus.

Here, it is assumed that the video data to be transmitted is previously stored in the image memory 1209 in the form of Y, M, C data.
CPU1 other than Y, M, C (eg R, G, B)
The data may be transmitted while being converted into Y, M, C by 215.

Although not shown in detail in FIG. 13, when sending,
The video data may be compressed and encoded by the DSP 1205 and the CPU 1215 and transmitted. As compression encoding, for example, 8 × 8
DCT (discrete cosine transform) is performed for each pixel, the transform coefficient obtained here is quantized, and then entropy coding is performed, or DPCM or the like is used.

 The transmission procedure will be described.

First, the NCU 1202 connects the communication line 1201 to the modem 1203, and the pre-procedure 1301 is performed via the communication control circuit 1204. This establishes communication conditions (communication speed, data transmission order, etc.).

Next, the CPU 1215 reads the Y data from the image memory 1209 and transmits it via the communication control circuit 1204, the modem 1203, and the NCU 1202. All Y data for one screen is transmitted (1303). Next, similarly, M data is transmitted (13
04, 1306). Then, C data is transmitted (1306, 130).
7).

Then, post-procedure 1308 is performed to end the communication and disconnect the communication line 1201.

FIG. 14 shows a processing flow on the receiving side.
The reception process will be described using this.

First, the communication line 1201 is connected to the modem 1203 by the NCU 1202, and the pre-procedure 1401 is performed via the communication control circuit 1204.

Next, the transmitted Y data is received (1402), and is expanded and decoded by using the DSP 1205 and CPU 1215, and then stored in the image memory 1209. Receives Y data for one screen (140
3) Then, after storing in the image memory 1209, the printer unit 1213
CPU1215 sends Y data to the printer I according to the printing direction of
The data is transferred to the printer unit 1213 via / F1212 and printing of Y color is started.

While printing Y color, M data is received similarly to Y data (1405) and stored in the image memory 1209. If the printing of Y color is completed (1407) at the stage of receiving one screen of M data (1406), then the M data is printed by the printer unit.
Transfer to 1213 and start printing of M color (1408).

Then, while printing the M color, the C data is received (14
09), and stores it in the image memory 1209. If the printing of the M color is completed at the stage of receiving the C data for one screen (1410) (1411), the printing of the C color is started (1412).

Further, after performing the post-procedure (1413), the C color is printed to the end (1414).

At the stage of receiving one screen of M data (1406),
If Y-color printing has not been completed (1407), reception of C data is started while printing Y-color (1415), and M-color printing is started at the time when Y-color printing is completed (1407). Start (1408). Then, when the printing of Y color is not completed at the stage (1416) of receiving one screen of C data, Y is printed.
After the color printing is completed (1417), the M color printing is started (1418).

13 and 14 show a flowchart for realizing the procedure of FIG. 4 with the configuration of the embodiment shown in FIG.
It is also possible to realize the procedure of FIG. 5, FIG. 7, and FIG. 8 with the same configuration as the figure.

By the way, in the above description, an example of converting image data into Y, M, C data and transmitting it has been shown, but each data of Y, M, C is obtained by inverting each data bit of B, G, R. It is also possible to obtain by doing. Therefore, each of the B, G, R data corresponds to the Y, M, C data in a one-to-one correspondence, so that in the present invention, the B, G, R data may be transmitted.

Further, in the description so far, the configuration in which the printer is incorporated has been shown, but this does not necessarily have to be incorporated, and the configuration may be connected to the outside. In that case, the still image transmission device and the printer may be connected by a digital interface such as RS-232C, or may be connected as an analog video signal.

EFFECTS OF THE INVENTION According to the present invention, it is possible to print on a printer while receiving video data, and to shorten the time from the start of receiving video data to the end of printing.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a still image transmitting apparatus according to the present invention, FIG. 2 is an explanatory diagram showing a printing operation of a printer, FIG. 3 is an explanatory diagram showing a relationship between transmission time and printing time,
4, 5, 7, and 8 are explanatory views showing the procedure of data transmission according to the present invention, FIG. 6 is an explanatory view showing the address relationship on the image screen, and FIG. 9 is the pre-procedure. FIG. 10, an explanatory view showing a specific example of post-procedure, FIG. 11 and FIG. 12 are block diagrams showing the configuration of another embodiment of the present invention, FIG. 13 and FIG. The figure is a flowchart showing a transmission flow at the time of transmission and reception of the still image transmission device in FIG. 101 ... Transmission device, 102 ... Reception device, 106, 117 ... Image memory, 107 ... Signal conversion circuit, 109 ... Transmission circuit, 110
...... Communication line, 114,124 …… System control circuit, 115 ……
Receiver circuit, 118 …… Printer I / F, 119 …… Printer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuo Ike Shoji Ike, 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Hitachi Video Engineering Co., Ltd. (72) Hiroyuki Kimura 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Hitachi, Ltd. Home Appliance Research Laboratory

Claims (10)

(57) [Claims] 1. A still image transmission apparatus capable of transmitting a color still image through a communication line and printing an image received through the communication line with a color printer, wherein an input image signal is the color image. Signal conversion means for converting into image data corresponding to a plurality of color components to be printed by the printer, and transmission control means for transmitting the image data converted by the signal conversion means in accordance with the color order to be printed by the color printer. A still image transmission device comprising: a printing control unit that causes the color printer to print an image while receiving image data from the communication line. 2. A still image transmission device capable of transmitting a color still image using a communication line and printing the received image on a color printer at the receiving side, wherein an image signal to be input is received by the color printer. Transmission control means for transmitting as a color order corresponding to the color order for printing, signal conversion means for receiving image data from the communication line and converting this into image data of color components to be printed by the color printer, A still image transmission device comprising: a printing control unit that prints the image data converted by the signal conversion unit by the color printer. 3. A still image transmission apparatus capable of transmitting a color still image using a communication line and printing the received image on a color printer at the receiving side. Signal conversion means for converting into image data corresponding to a plurality of color components, and transmission control means for transmitting the image data converted by the signal conversion means for each line in line with the scanning direction of the color printer, A still image transmission device comprising: a printing control unit that causes the color printer to print an image each time one line of image data is received from the communication line. 4. A still image transmission device capable of transmitting a color still image using a communication line and printing the received image on a color printer at the receiving side. As a color order corresponding to the color order for printing, transmission control means for sending one line at a time in accordance with the scanning direction of the color printer, and a color for receiving an image signal from the communication line and printing the image signal by the color printer And a print control unit configured to print the image data converted by the signal conversion unit for each line by the color printer. Still image transmission device. 5. A still image transmission device capable of transmitting a color still image using a communication line and printing the received image on a color printer at the receiving side. The input image signal is printed by the color printer. Signal conversion means for converting into image data corresponding to a plurality of color components, and transmission control for transmitting each color component of the image data converted by the signal conversion means by one line in line with the scanning direction of the color printer. Means and a printing control means for printing by the color printer every time one line of each color component of image data is received from the communication line for all color components. apparatus. 6. A still image transmission device capable of transmitting a color still image using a communication line and printing the received image on a color printer at the receiving side. As a color component corresponding to the color component to be printed, transmission control means for transmitting each color component for one line in accordance with the scanning direction of the color printer, and an image signal from the communication line, which is received by the color printer. A signal conversion unit that converts image data of a color component to be printed, and a printing control unit that causes the color printer to print the image data converted by the signal conversion unit each time one line of all color components is received. A still image transmission device comprising: 7. A still image transmission system capable of transmitting a color still image using a communication line and printing the received image on a color printer at the receiving side, in a transmission unit capable of being printed by the color printer at the receiving side. A still image characterized by comprising means for transmitting image data composed of a plurality of color components and means for performing printing in parallel with reception of the next image data each time this transmission unit is received. Transmission system. 8. The still image transmission system according to claim 7, wherein the transmission unit is one line in the scanning direction printed by the color printer. 9. The still image transmission system according to claim 7, wherein the transmission unit is one line in the scanning direction printed by the color printer for each color component forming the image data. 10. A means for detecting a transmission error and making a resend request, and a means for, when a resend request is made, controlling so as to start printing after the data is corrected by resending. The still image transmission device according to claim 1, 2, 3, 4, 5 or 6, or the still image transmission system according to claim 7, 8 or 9.