JPH01179569A - Control system for facsimile equipment - Google Patents

Abstract

PURPOSE:To improve the utilizing efficiency of picture information accumulating function when an error correcting mode is used by accumulating receiving picture information, which are received with using the error correcting mode, to the picture information accumulating function in a condition that only an encoding code is extracted by an encoding code extracting means. CONSTITUTION:When the picture information are transmitted from another facsimile equipment in a condition that the error correcting mode is designated, a CPU1 executes a specified transmitting procedure at the time of the error correcting mode and receives the picture information. Then, the picture information are successively accumulated to a transmitting buffer which is formed in an RAM2. The CPU1 decodes the received picture information, which are accumulated in the transmitting buffer, by an encoding decoding part 8 and transfers the information to a protter 5 in a condition that the information are converted to an original picture signal. Then, an EOL(End of Line) code and a fill bit are removed and the received picture information are converted to a condition that only encoding data are extracted. Then, the received information are temporarily accumulated in a picture accumulating device 7. Thus, the utilizing efficiency of the picture accumulating device 7 can be improved.

Description

[Detailed Description of the Invention] [Prior Art] In recent years, facsimile machines equipped with an image storage function have been put into practical use, and this image storage function can be used to perform, for example, confidential reception, substitute reception, time-specified transmission, and broadcast transmission. , relay message transmission, and other functions are also provided.

Conventionally, when storing received image information, the image information is stored in the state in which it is received, that is, at the end of line (EOL) that separates lines, which are units of encoding image information.
) The image information was stored including the code.

When decoding image information to form the original image signal (decoding process), this method checks the line length of each image signal obtained and checks whether a transmission error has occurred in the received image information. Therefore, when a transmission error is detected, the transmission side is notified of the occurrence of the transmission error by responding with a corresponding procedure signal.

On the other hand, in order to avoid such transmission errors, CCI
The TT (International Telegraph and Telephone Advisory Committee) has established a standard method for error correction mode in Recommendation T, 30, which specifies the functionality of Group 3 facsimile equipment.
It has been proposed in the form of an annex (Annex A).

In this recommendation, the encoded and compressed image information is divided into frame data units of a fixed frame size from the beginning, and the image information for each frame is processed using the HDLC (High Level Data Link Control) procedure. It is transmitted in a formatted frame (as shown).

Then, on the receiving side, it is checked whether an error has occurred in each frame by referring to the error detection information (frame check sequence; shown in the figure) added to each frame, and the frame with the error is removed as a single frame. If more than one frame is detected, a retransmission request is sent to the transmitting side with information added to notify the transmitting side of the reception status of all received frames.

As a result, the transmitting side retransmits only the image information of the frame in which the transmission error has occurred, and by repeating this process, the receiving side can finally receive accurate image information.

Therefore, when a facsimile machine equipped with the above-mentioned image information storage function receives image information using this error correction mode, the accuracy of the received image information is compensated, so that after decoding, as described above, In order to detect transmission errors by referring to the line length of the image signal, there is no need to store image information including the EOL code.

In other words, when image information is received using error correction mode, excess information is also stored in the image information storage function.
This causes the inconvenience that the efficiency of using the image information storage function deteriorates.

[Purpose] The present invention has been made in order to solve the problems of the prior art, and it is an object of the present invention to provide a control method for a facsimile machine that can improve the efficiency of using the image information storage function when using the error correction mode. It is said that

[Configuration] In order to achieve this object, the present invention includes an encoding code extracting means for extracting only the encoding code of image information, and extracts the encoding code from the received image information received using the transmission error correction function. Only the encoded code is extracted by the extraction means and stored in the image information storage function.

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

FIG. 1 shows a facsimile machine according to an embodiment of the present invention.

In the figure, a CPU (central processing unit) 1 is for controlling the entire facsimile machine and facsimile transmission control procedure processing, and its control program is stored in a ROM (read-only memory) 2. The work area and transmission buffer used in error correction mode are RAM (Random Access RAM).
memory) 3.

The scanner 4 is for reading the transmitted original at a predetermined resolution, the plotter 5 is for printing the received image at a predetermined resolution, and the operation display section 6 is for operating the facsimile machine. The image storage device 7 stores image information in an encoded and compressed state.

The encoding/decoding unit 8 encodes and compresses the transmitted image signal and decodes the received image information into the original image signal. The encoding/decoding unit 8 also has a function of removing the EOL code and fill pits from the received image information and extracting only the encoded code, as will be described later.

The modem 9 modulates and demodulates digital data so that an analog line network such as a public telephone line can be used as a transmission line, and the network control device 10 is used to connect a facsimile device to the public telephone line network. belongs to. Furthermore, this network control device 10 is equipped with an automatic call origination/reception function.

CPUI, ROM2) RAM3, scanner 4, plotter 5, operation display section 61 image storage device 7, encoding/decoding section 8
, modem 9, and network control device 10 exchange necessary data with each other via a system bus 11.

It should be noted that each of the above-mentioned elements realizes the same functions as those of the conventional device, and in the following explanation, explanation of the operation of parts that are not directly related to the present invention will be omitted.

With the above configuration, if image information is transmitted from another facsimile machine with error correction mode specified, C
The P old executes the transmission procedure in the prescribed error correction mode, receives the image information, and sequentially stores it in the transmission buffer formed in the RAM 2.

At the same time, the CPUI causes the encoder/decoder 8 to decode the received image information accumulated in the transmission buffer, convert it into the original image signal, and transfer it to the plotter 5, and removes the EOL code and fill bit. The received image information is converted into a state in which only encoded data is extracted, and the received image information is temporarily stored in the image storage device 7.

A processing example of the encoding/decoding section 8 at this time is shown in FIG.

That is, the encoding/decoding unit 8 firstly encodes the image storage device 7.
After initializing internal variables such as a save pointer that specifies the location (address and bit location) where the encoded code is stored (process 101), the decoding process for one page's worth of image information is completed. Check whether it has been done (decision 102),
If the result of this judgment 102 is NO, decoding processing for one encoded data is executed (processing 103).

Next, the encoded data identified at that time is stored in the storage area of the image storage device 7 at the location indicated by the save pointer (1o4), and the next bit position of the encoded data is indicated. The contents of the save pointer are updated as follows (process 105).

At the same time, the decoded image signal is transferred to the plotter 5 (processing 106).

Here, it is checked whether an EOL code is detected at that time (decision 107), and if the result of determination 107 is NO, the process returns to determination 102 and the subsequent processes are repeated.

Further, when the result of judgment 107 is YES, the value of the save pointer is updated in process 1 so as to point to the position of the first bit of the EOL code detected at that time.
0'8), the process returns to judgment 102 and the subsequent processes are repeated. That is, the EO stored in the image storage device 7
Overwrite the L code with the next encoded data.

Also, the decoding of image information for one page is completed, and judgment 10
If the result of step 2 becomes YES, this process ends.

In this way, when the image information stored in the transmission buffer is stored in the image storage device 7, when an EOL code is detected, the contents of the storage area of the EOL code are replaced with the next encoded data. So, as a result,
The image information stored in the image storage device 7 is converted into a state in which the EOL code and fill pits are removed.

As a result, an image corresponding to the received image information is recorded and outputted from the plotter 5, and only the encoded data of the image information is sequentially stored in the image storage device 7.

Therefore, for example, when a paper jam occurs in the plotter 5 during recording and the recording operation of the plotter 5 is interrupted, the received image information of the page where the paper jam occurred is stored in the image storage device 7, so that the plotter 5 When the paper jam is cleared, the image information for that page is read from the image storage device 7, decoded into an image signal by the encoder/decoder 8, and transferred to the plotter 5, thereby recording the received image from the plotter 5. It is possible to output images appropriately even when the plotter 5 becomes jammed.

In addition, the image information accumulated in the image storage device 7 in parallel with the recording output of the plotter 5 in this way is erased from the image storage device 7 when the corresponding image is normally recorded and output from the plotter 5. Ru.

Kokote, EOL D-do is rooooooooooooo
It is a 12-bit pattern, and two consecutive
In any combination of two encoded data, rQJ
Since the maximum number of consecutive "0"s is 7, when there are 8 or more consecutive "0"s, it can be determined as an IEOL code or a Philpit 10 EOL code.

Using this, the encoding/decoding unit 8 determines the EOL code based on the number of consecutive "0"s.

In this way, the received image information is sent to the image storage device 7 with the EOL code and fill pits removed. For example, if the size of the received image is 44 format,
Since the number of lines is about 1000, the size of the received image information can be suppressed to about 12 bytes.

As a result, the usage efficiency of the image storage device 7 can be improved by about 10%.

By the way, in the above-mentioned embodiment, the received image is sent to the plotter 5.
Although the case of directly recording and outputting has been described, the present invention can be similarly applied to cases where other reception modes are used, such as confidential reception or proxy reception.

Furthermore, in the above-described embodiment, image information is stored in the image storage device and image recording and output from the plotter are performed in parallel; The present invention can be similarly applied to the case of only accumulation.

[Effects] As explained above, according to the present invention, focusing on the accuracy of received image information when using the error correction mode, the present invention includes an encoding code extraction means for extracting only the encoding code of the image information, Since the received image information received using the error correction mode is stored in the image information storage function with only the encoded code extracted by the encoded code extraction means, the image information storage function when using the error correction mode is This has the effect of improving usage efficiency.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a facsimile apparatus according to an embodiment of the present invention, and FIG. 2 is a flowchart showing an example of processing at the time of decoding by an encoding/decoding section. 1...CPU (central processing unit), 2...ROM
(Read-only memory), 3...RAM (Random access memo January) 7...Image storage device, 8...Encoding/decoding unit. Fig. 1 Fig. 2

Claims (2)

[Claims] (1) In a control method for a facsimile machine equipped with an image information storage function and a transmission error correction function, the facsimile apparatus is equipped with an encoded code extraction means for extracting only the encoded code of image information, and the received data is received using the transmission error correction function. 1. A control method for a facsimile apparatus, characterized in that the encoded code extracting means extracts only encoded codes from image information and stores the extracted codes in the image information storage function. (2) In claim 1, the encoded code extracting means is an encoding/decoding means that encodes and compresses an image signal and decodes encoded image information into an image signal. A facsimile device control method characterized by: