JPH09154024A - Color image data transmitting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten communication time and to reduce communication costs in the case of color image data transmission between host devices having difference in color image expression forms. SOLUTION: At a color image data transmitter on the reception side, a decoding means 27 decodes color image encoded data received from a communication line network 30 by a line control means 25 and stored in a received data storage means 26, and a color image expression form judging means 28 judges whether the color image expression form of decoded color image data is suitable for the host device on the reception side or not. When the expression form is suitable, the image data are stored in an image data storage means 22 as they are but when the expression form is not suitable, this color image expression form is converted by a color image expression form converting means 29 so as to be suitable for the host device on the reception side, the color image data converted into this expression form are stored in the image data storage means 22, and these color image data are transferred to the host device on the reception side by a host control means 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image data transmission system for realizing color image data transmission between host devices having different color image representation formats by mutually converting color image representation formats.

[0002]

2. Description of the Related Art Color image representation formats include frame sequential (component interleave) that handles color image data on a plane basis, line sequence (line interleave) that handles color image data on a line basis, and color image on a pixel basis. There is a dot sequence (pixel interleave) that handles data.

Therefore, host devices such as personal computers, workstations, and digital color copying machines that handle color image data have a color image expression format of a frame sequential method, a line sequential method, or a dot sequential method.

Conventionally, when transmitting color image data between the above-mentioned host devices, a color image data transmission device for encoding and decoding color image data is provided in both host devices, and a color image representation format is provided. Color image data is transmitted and received by a color image data transmission device using the same host device.

When the color image representation formats of the transmitting side and receiving side host devices are different, a color image representation format converting means is provided in the transmitting side color image data transmitting apparatus, and the color image representation format converting means is used. The data was transmitted after being converted into the color image representation format of the receiving host device.

[0006]

However, in the case of transmitting color image data between a plurality of host devices, it is rare that all host devices have the same color image representation format, and normally, Color image data is transmitted between host devices having different color image expression formats. At this time, the transmission side color image data transmission apparatus having the color image expression format conversion means, before transmitting the color image data, It is necessary to access the color image data transmission device on the receiving side in advance to recognize the color image expression format of the host device on the receiving side, and since the color image data is transmitted while being converted to the color image expression format of the host device on the receiving side, The communication time increases by the time required to recognize the color image representation format and the time required for the conversion processing, and as a result, the communication Door there is a problem that increases.

The present invention solves such a problem, and in the transmission of color image data between host devices having different color image representation formats, it is possible to reduce the communication time and the communication cost. It is intended to provide a data transmission method.

[0008]

In order to solve the above-mentioned problems, a color image data transmission system of the present invention is a host device which handles only color image data of a specific color image expression system, a host device and a communication line. In a color image data transmission system comprising a color image data transmission device for controlling transmission / reception of color image data to / from a network, host control means for receiving the color image data generated by the host device, and the host control means An image data storage unit for storing the transferred color image data, an encoding unit for encoding the color image data in the image data storage unit to convert it into color image encoded data, and the color image encoded data The transmission data storage means to be stored and the color image coded data stored in the transmission data storage means are stored in advance. The image data transmission unit of the color image data transmission device is provided with a line control means for transmitting to a destination via a communication network, and the color image coded data transmitted from the destination is received via the communication network. The line control means, the received data storage means for storing the received color image coded data, and the decoding means for decoding the color image coded data stored in the received data storage means into color image data. A color image representation format determining means for determining whether or not the color image representation format of the decoded color image data is compatible with the host device; and the color image representation format determining means is not compatible with the host device. A color for converting the color image representation format of the color image data determined to be the color image representation format compatible with the host device. An image representation format conversion means, and the image data storage means for storing color image data having a color image representation format suitable for the host device, transferred from the color image representation format determination means or the color image representation format conversion means. The image data receiving unit of the color image data transmission device is provided with the host control device for transferring the color image data of the image data storage device to the host device.

Therefore, according to the color image data transmission system of the present invention, when the color image data generated by the host device is transmitted to the other party, the host control means is provided in the image data transmission section of the color image data transmission device. The transferred color image data is stored in the image data storage means, the color image data is encoded by the encoding means to be converted into color image encoded data, and the color image encoded data is transmitted data storage means. In the case of transmitting the color image coded data that has been accumulated to the other party through the communication network by the line control means and receiving the color image data from the other party through the communication network, In the image data receiving unit of the image data transmission device, the color image encoded data received by the line control means is received data. The color image coded data stored in the storage means is decoded into color image data by the decoding means, and it is determined whether or not the color image representation format of the decoded color image data is compatible with the host device. The color image data is judged by the expression format judgment means, and if it matches, the color image data is stored in the image data storage means as it is. If it does not match, the color image expression format of this color image data is hosted by the color image expression format conversion means. The color image data converted so as to be suitable for the device and converted into this expression format is stored in the image data storage means, and the color image data stored in the image data storage means is transferred to the host device by the host control means.

In this way, the color image data of the received color image data is transmitted by the color image data transmission device of the transmission side in the color image expression format of the host device of the transmission side, and the color image data of the received color image data is expressed in the color image data transmission device of the reception side. By converting the format so that it matches the host device on the receiving side, even if the color image representation format on the host device on the transmitting side and the host device on the receiving side are different, the color image of the receiving side host device is transmitted in the color image data transmitting device on the transmitting side. Since it is not necessary to recognize the expression format and it is not necessary to perform data transmission while converting the color image expression format,
It is possible to reduce the communication time and the communication cost.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the basic configuration of a communication system to which the color image data transmission system of the present invention is applied.

In FIG. 1, reference numerals 10 and 50 denote host devices for generating color images, such as workstations and color copying machines. The host devices 10 and 50 can only handle color image data in a specific color image representation format. I shall.

Reference numeral 20 encodes the frame-sequential color image data transferred from the host device 10 and sends it to the communication line network 30, and receives the dot-sequential color image coded data by the host device 50 from the communication line network 30. Communication network 3
This is a color image data transmission device that disconnects the communication line with 0 and then converts the color image representation format of the received color image encoded data into a frame sequential format suitable for the host device 10 and transfers it to the host device 10.

A communication line network 40 encodes dot-sequential color image data transferred from the host device 50.
To the color image of the received color image encoded data after disconnecting the communication line with the communication line network 30 by receiving the frame-sequential color image encoded data by the host device 10 from the communication line network 30. The representation format is the host device 50.
Is a color image data transmission device that converts the data into a dot sequence that conforms to the above and transfers it to the host device 50.

That is, the host device 10 and the host device 5
Even when 0 can handle only different color image representation formats, by providing the color image data transmission device 20 and the color image data transmission device 40 respectively, transmission and reception of color image data via the communication network 30 can be performed in the same manner. The transmission and reception can be performed in the same communication time between the color image generating devices in the color image expression format.

Next, the above-mentioned color image data transmission device 20
And 40 will be described.

FIG. 2 shows the above-mentioned color image data transmission device 2
The structure of 0 and 40 is shown.

A color image data transmission device 20 shown in FIG.
In (or 40), 21 is host control means for connecting to the host device 10 (or 50), 22 is color image data input from the host device 10 via the host control means 21, and to the host device 10. An image data storage means for storing color image data to be output.

Reference numeral 23 is an encoding means for encoding the color image data and converting it into color image encoded data, and 24 is a transmission data storage means for accumulating the color image encoded data to be sent to the communication line network 30.

A line control means 25 is connected to the communication line network 30 and controls transmission / reception of color image coded data to / from the communication line network 30.

Reference numeral 26 is a reception data storage means for accumulating color image coded data received by the line control means, 2
Decoding means 7 decodes the received color image coded data to restore the color image data.

28 is a judging means for judging the difference between the color image representation format of the restored color image data and the color image representation format of the host device 10 (or 50), and 29 is the color image representation format of the restored color image data. Is a color image representation format conversion means for converting the color image data into a color image representation format suitable for the host apparatus 10 when the color image data is different from that of the host apparatus 10.

Next, a procedure for transmitting and receiving color image data in this embodiment will be described.

In the following explanation of the transmission / reception procedure,
The color image data generated by the host device 10 is sent to the communication line network 30 by the color image data transmission device 20 as color image coded data, and the color image code received by the color image data transmission device 40 from the communication line network 30 is encoded. It is assumed that the data is restored to color image data and transferred to the host device 50.

First, the transmission processing procedure in the color image data transmission device 20 on the transmission side will be described.

The color image data generated by the host device 10 is transferred to and stored in the image data storage means 22 by the host control means 21.

This color image data is encoded by the encoding means 23.
Is encoded and converted into color image encoded data, and this color image encoded data is sequentially transferred to and accumulated in the transmission data storage means 24.

The color image coded data stored in the transmission data storage means 24 is converted into a CDUI signal by the line control means 25 in accordance with the format for data transmission, and is sequentially sent to the communication line network 30.

At this time, the line control means 25 adds to the CDUI signal information for notifying the receiving side of the color image representation format of the color image encoded data, that is, the color image representation format of the host device 10. .

FIG. 3 shows a procedure for transmitting color image coded data by the line control means 25.

In this case, the transmission side of FIG. 3 corresponds to the line control means 25 of the color image data transmission device 20 (referred to as the transmission side line control means in the following description of FIG. 3).
The receiving side corresponds to the line control means 25 of the color image data transmission device 40 (referred to as the receiving side line control means in the following description of FIG. 3).

In FIG. 3, the transmission side line control means transmits a CSS signal for notifying the reception side line control means of the start of communication in step 301.

Information indicating the color image representation format of color image coded data to be transmitted is added to this CSS signal.

When the receiving side line control means receives the CSS signal, recognizes the start of data transmission by the transmitting side line control means, and recognizes the color image representation format of the data to be received at step 313, step 302
Then, the RSSP signal which is a response to the CSS signal is transmitted.

Next, the transmission side line control means, when receiving the RSSP signal, transmits the CDCL signal in step 303.

Information indicating the color image representation format of transmission data may be added to this CDCL signal.

Subsequently, the transmission side line control means performs step 3
When the RDCLP signal, which is a response to the CDCL signal in 04, is received, the CDS signal for notifying the start of data transmission is transmitted in step 305, and in step 306 to step 308, the CDU including the color image encoded data is transmitted.
The I side signal is transmitted, and the receiving side line control means sequentially stores the received CDUI signals in the received data storage means 26.

Information indicating the color image representation format of the transmission data may be added to the CDUI signal as a header.

When the transmission side line control means completes the transmission of the CDUI signal, it transmits a CDE signal for notifying the end of the data transmission in step 309, and then in step 31.
When the RDEP signal which is a response to the CDE signal is received at 0, C for notifying the end of communication at step 311
Send SE signal.

Upon receiving the CSE signal, the receiving side line control means transmits an RSEP signal which is a response to the CSE signal in step 312, and executes a line disconnection process for disconnecting the connection with the communication line network 30 in step 314. Terminate communication.

When the communication line network 30 recognizes the line disconnection of the receiving side line control means and transmits a disconnection signal to the transmitting side line control means in step 315, the transmitting side line control means
Upon receiving the disconnection signal, the line disconnection process is performed in step 316, and the communication is terminated.

The time from the start of communication to the processing of disconnecting the line is the time when the communication line network 30 is used, and thus the communication cost, that is, the communication time.

Next, the reception processing procedure in the color image data transmission device 40 on the receiving side will be described.

FIG. 4 is a flow chart showing a receiving processing procedure in the color image data transmitting apparatus 40.

In FIG. 4, the line control means 25 includes the transmission side color image data transmission device 20 to the communication line network 30.
The CDUI signal transmitted via the terminal, that is, the color image encoded data is received, and the received data storage means 26 is sequentially received.
When the color image coded data is received, the line disconnection process is performed in step 401 to end the communication.

The color image coded data accumulated in the reception data storage means 26 is decoded into color image data by the decoding means 27, and the decoded color image data (hereinafter referred to as reception color image data). Is transferred to the color image representation format determining means 28.

The color image expression format judging means 28 recognizes the color image expression format of the host device 50 in advance in step 402, and in step 403, the received color image data notified by the CSS signal or the like shown in FIG. The color image representation format is compared with the color image representation format of the host device 50. If the color image representation format is the same,
The received color image data is directly transferred and stored in the image data storage means 22, and the process proceeds to step 405. If the color image expression format is different, the received color image data is transferred to the color image expression format conversion means 29 and the step is performed. 40
Proceed to 4.

In step 404, the color image expression format conversion means 29 converts the received color image data into the color image expression format of the host device 50, and transfers the received color image data converted into this expression format to the image data storage means 22. Store.

Then, in step 405, the host control means 2
1 transfers the received color image data transferred and stored in the image data storage means 22 to the host device 50, and ends this flow.

For example, suppose that the color image representation format of the host device 10 is frame sequential and the color image representation format of the host device 50 is dot sequential because the color image representation format of the received color image data is frame sequential. The color image expression format determining means 28 determines that the expression formats are different, and the received color image data is transferred to the color image expression format converting means 29, and converted by the color image expression format converting means 29 into dot-sequential color image data. The dot-sequential received color image data is transferred to the host device 50 by the host control means 21.

If the color image representation formats of the host devices 10 and 50 are both frame sequential, the received color image data is transferred from the color image representation format judgment means 28 directly to the image data storage means 22.

As described above, according to the embodiment of the present invention,
In the color image data transmission device 20 on the transmission side,
The color image data generated by the host device 10 is stored in the image data storage means by the host control means 21, the color image data is encoded by the encoding means 23 to be converted into color image encoded data, and this color The coded image data is stored in the transmission data storage means 24, and the stored color image coded data is transmitted by the line control means 25 to the color image data transmission device 40 on the receiving side via the communication line network 30, and the color data is transmitted. In the image data transmission device 40, the color image encoded data received by the line control means 25 is accumulated in the received data storage means 26, and the accumulated color image encoded data is decoded by the decoding means 2
7, the color image representation format of the decoded color image data is decoded by the host device 5.
It is determined whether or not 0 is satisfied by the color image expression format determining means 28.
The color image data is stored in the image data storage means 22 as it is, and if not, the color image expression format of the color image data is converted by the color image expression format conversion means 29 into the host device 50. The color image data converted into this expression format is stored in the image data storage means 22, and the color image data stored in the image data storage means 22 is transferred to the host device 50 by the host control means 21. Even if the color image representation formats of the host device 10 on the transmission side and the host device 50 on the reception side are different by the transfer, the color image representation format of the host device 50 on the reception side is recognized by the transmission color image data transmission device 20. There is no need to do so, and it is necessary to perform data transmission while converting the color image representation format. Since there is no, it is possible to reduce the shortening and communication cost of the communication time.

[0054]

As described above, according to the color image data transmission system of the present invention, the color image data transmission device on the transmission side transmits color image data in the color image representation format of the host device on the transmission side and the color image data is transmitted on the reception side. In the color image data transmission device, the color image representation format of the received color image data is converted so as to be compatible with the reception side host device, so that the color image representation format of the transmission side and the reception side host device is different. The transmission side color image data transmission device does not need to recognize the color image expression format of the reception side host device, and since it is not necessary to perform data transmission while converting the color image expression format, it is possible to reduce communication time and It has an excellent effect that the communication cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic configuration of a communication system to which a color image data transmission system of the present invention is applied.

FIG. 2 is a diagram showing a configuration of a color image data transmission device according to an embodiment of the present invention.

FIG. 3 is a diagram showing a procedure for transmitting color image coded data by the line control means according to the embodiment of the present invention.

FIG. 4 is a flowchart showing a receiving processing procedure in the receiving side color image data transmitting apparatus according to the embodiment of the present invention.

[Explanation of symbols]

 10, 50 Host device 20, 40 Color image data transmission device 21 Host control means 22 Image data storage means 23 Encoding means 24 Transmission data storage means 25 Line control means 26 Received data storage means 27 Decoding means 28 Color image representation format judgment Means 29 color image representation format conversion means 30 communication line network

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinji Sato 94, Kuniyama City, Fukushima Prefecture, Futaba 94, Nippon Telecom Technology Co., Ltd. Within Telecom Technology

Claims (1)

[Claims] 1. A color image comprising a host device that handles only color image data of a specific color image representation system and a color image data transmission device that controls transmission and reception of color image data between the host device and a communication network. In the data transmission system, host control means for receiving the color image data generated by the host device, image data storage means for storing the color image data transferred from the host control means, and color of the image data storage means Encoding means for encoding image data to convert it to color image encoded data, transmission data storage means for accumulating the color image encoded data, and color image encoded data accumulated in the transmission data storage means To the other party via the communication network, and a line control means for transmitting the color image data. The image data transmitting unit of the device, the line control means for receiving the color image coded data transmitted from the other party via the communication line network, and the received data for accumulating the received color image coded data Storage means, decoding means for decoding color image coded data stored in the received data storage means into color image data, and a color image representation format of the decoded color image data is suitable for the host device. Color image expression format determining means for determining whether or not to perform the color image expression format of the color image data determined by the color image expression format determining means to be incompatible with the host device. Color image expression format conversion means for converting into an image expression format, and the color image expression format determination means or color image The image data storage means for storing color image data having a color image representation format suitable for the host device transferred from the current format conversion means, and the color image data in the image data storage means for transferring to the host device. A color image data transmission system comprising the host control means in an image data receiving section of the color image data transmission device.