JPS6146672A - Ineffective information transmission system - Google Patents

Abstract

PURPOSE:To improve the transmission efficiency by providing an ineffective information buffer and a processing data quantity counter and transmitting ineffective information in response to a picture data transmission request when the count of the counter is zero so as to minimize the transmission of the ineffective information. CONSTITUTION:A picture signal transmitted from a picture signal control section is subject to a processing such as synthesis and compression at a picture processing section 12. One section of a transmission buffer 16 of a picture signal transmission control section 14 receives a processed picture signal and the section 14 starts the transmission of a picture signal through a line 22 when a picture data transmission request is given from the reception side. A succeeding processed picture signal from the picture processing section 12 is stored in other section of the transmission buffer 16. The storage of the data to the transmission buffer 16 or the data transmission from the transmission buffer 16 is represented by increment (+1) or decrement (-1) of a counter 18, and when the count of the counter 18 is zero, ineffective information stored in a buffer 20 is transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an invalid information transmission method in a system in which both data are subjected to processing such as compression and transmitted to a receiving side through a communication line.

[Conventional technology]

In systems that transmit image data through communication lines such as facsimile, the image data is subjected to compression processing such as run-length encoding and transmitted using variable length codes in order to improve transmission efficiency. This is also stipulated in the CCITT Recommendation. Similarly, when transmitting image data that has been subjected to composition processing, it is compressed and encoded before being sent.

It is preferable that the processing speed for compressing and synthesizing these image data is equal to the transmission speed, but for example, the run-length code of the scanning line of a characterless blank area is simple and has a small amount, so the transmission time is short, whereas that of the character part is complex and has a large amount of data. Therefore, since the time required for transmission varies, the processing speed and the transmission speed do not necessarily match.

The transmission of visual data is based on lines (scanning lines or their image data), and as shown in Figure 2 (al), a delimiter code EO■7 (en IS) is placed at the end of one line of data.
(O-line), and this data part and EOL make up about 1 transmission amount. However, if the processing speed is slower than the transmission speed, a situation will occur in which there will be no data to be transmitted, and if the no-transmission data state continues for a predetermined period of time, the line will be disconnected.
Invalid information (fill) between data section and EOL like
is inserted to adjust the processing time delay. Fill insertion rarely occurs when the transmission speed is slow, but when the transmission speed increases and processing time increases due to compositing processing, etc., fill insertion often occurs. . Since both types of data have a large amount of data, compression processing is performed to improve transmission efficiency, but if invalid information is inserted during transmission, the effect of data compression is diminished.

Both data cannot be transmitted until one line of data has been combined and compressed.

This is to deal with the fact that if an error is discovered during processing, the data will be lost. Conventionally, processing data is stored in a transmission buffer, and after one line of processing is completed, the amount of processing data in the buffer is a predetermined amount (this is determined by considering the longest processing speed of one line of data).
Otherwise, the missing information would be filled in with invalid information. That is, as shown in FIG. 2, if the predetermined amount is 100 bytes and the data in the transmission buffer is less than 100 bytes, invalid information is sent between the EOL placed on the floor, that is, the 100th hide, and the data section. *ii r fill", and the image data of the next line is stored from after the EOL.

[Problem that the invention seeks to solve]

However, with this method, if the amount of data in the next line is 100 bytes or more, for example 150 bytes, even if the data in the previous line (that is, the fill) is 50 bytes, the total will be 200 bytes, or 100 hides on average. ,
If the transmission has not yet reached the fill portion at the stage where data creation for the next line is completed due to a delay in transmission, it means that there is no need to fill.

In other words, in the conventional method, fearing the worst case scenario, if the data for one line does not reach a predetermined amount, fills are added. Buffers have wasted space and the storage space becomes large.

The present invention improves this point by directly transmitting fills only when necessary, without filling them into a transmission buffer. In this way, it is possible to further reduce the amount of data transmission and the capacity of the transmission buffer.

[Means for solving problems]

The present invention includes a transmission buffer in the image signal transmission control section, processed image data is written into the buffer, and image data is transferred from the buffer to the communication line in response to a line-by-line image data transmission request from the receiving side. In an invalid information transmission method in an image data transmission system in which image data is sent to a receiving side through A counter that decrements when one line of image data is sent out and a buffer that stores invalid information are provided, and when the count value of the counter is O and there is a request to send image data from the receiving side, invalid information is sent from the buffer. Although it is characterized by transmitting information, the structure and operation will be explained next with reference to embodiments.

〔Example〕

FIG. 1 shows an embodiment of the present invention, in which 10 is an image control unit;
2 is an image signal processing section, 14 is an image signal transmission control section, 16 is a transmission buffer, 18 is a counter for processing data amount, and 20 is a buffer for invalid information (fill).

To explain the operation, image signals sent from both signal control sections are subjected to processing such as synthesis and compression in the image processing section 12.

The image signal transmission control unit 14 receives both processed signals into one section of the transmission buffer 16, and when the 1942-minute signal is collected and an image data transmission request (this is issued on a line-by-line basis) is sent from the receiving side, the signal is sent to the line 22. The transmission of the image signal to the receiving side is started through the image processing section 12, and the subsequent image signal to be processed from the image processing section 12 is stored in another section of the transmission buffer 16. In this way, the transmission buffer 16 simultaneously transmits and stores data,
The output image signals of the image processing section 12 are sequentially sent to the line 22.

The counter 18 counts the image signals stored in the transmission buffer 16 line by line. The control section 14 sends out an image signal from the transmission buffer 16 when the count value of the counter 18 is not 0. The counter 18 increments, ie, +1, when a 1-line fractional signal is stored from the image processing unit 12 to the transmission buffer 16, and decrements, ie, -1, when a 1-line fractional signal is sent from the transmission buffer 16 to the line 22.
Therefore, the count value of this counter 18 is
6 shows the current amount of data in line units. When the count value of the counter 18 is O and an image data transmission request is sent, the control section 14 sends invalid information from the buffer 20. The receiving side receives the invalid information, and once it is processed, it sends an image data transmission request again, but if the count value of the counter 18 is still 0, the control unit 14
The invalid information is sent again from 0, and this process is repeated thereafter.

When one line of processing is eventually completed and the count value of the counter 18 is updated, the control section 14 sends out an image signal from the transmission buffer 16 in accordance with an image data transmission request from the receiving side.

〔Effect of the invention〕

As explained above, the present invention has an invalid information buffer and a processing data amount counter, and the count value of the counter is 0.
In response to an image data transmission request, invalid information is sent directly from the buffer, so invalid information does not need to be accumulated in the transmission buffer, eliminating wasteful use of the buffer and reducing storage capacity. Since invalid information is sent to the minimum necessary level, transmission efficiency can also be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a conventional system. In the drawing, 14 is an image signal transmission control unit, 16 is a transmission buffer,
18 is a counter, 20 is a buffer, and 22 is a line.

Claims (1)

[Claims] The image signal transmission control unit includes a transmission buffer, processed image data is written into the buffer, and image data is transmitted from the buffer in response to a line-by-line image data transmission request from the receiving side. In an invalid information transmission method in an image data transmission system that transmits image data to a receiving side through a communication line, the image signal transmission control unit is incremented when one line of image data to be processed is written to the transmission buffer;
A counter that decrements when one line of image data to be processed is sent from the transmission buffer and a buffer that stores invalid information are provided, and when the count value of the counter is 0, there is a request for image data transmission from the receiving side. An invalid information transmission method characterized in that invalid information is transmitted from the buffer at times.