JPH06101792B2 - Image data combiner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] The present invention is a device for combining encoded image data in facsimile communication, in which the end signal and pad bits of the combined image data are removed and the all white line is the last bit in the horizontal mode code. In addition to the above, there is provided a combining device for combining the encoded image data by forming the combined image data into a predetermined format by the vertical mode all-white line code.

[Industrial application field]

The present invention relates to a combining device for combining encoded image data in facsimile communication.

In facsimile communication, there is a demand for combining image data such as combining and transmitting a plurality of encoded image data stored in a file, or attaching a document of a file to a read original and transmitting the combined document.

The image data encoded by the high-efficiency two-dimensional encoding method is encoded in page (or block) units, and the first line uses the reference line as an all-white line and the subsequent second line.
The last line is encoded by using the immediately preceding line as a reference line, and is terminated by an end signal and a pad bit (variable length code of "0") for forming a byte unit of image data.

Therefore, when the coded image data is combined by removing the end signal, a restoration error occurs if the final line of the combined image data is not an all white line or if the final bit of the combined image data is not a byte boundary.

In the two-dimensional encoding method such as MR and MH method used in G3 etc., since the line sync signal is provided in the image data and the fill can be identified, the end signal is removed as described above. Can be combined.

However, the high-efficiency two-dimensional coding method adopted in the facsimile machine (G4 machine) using the data communication network does not have a line synchronization signal, cannot identify the pad bit, and cannot be easily combined.

Therefore, after restoring each encoded image data, combine them,
A method such as encoding again is considered, but there is a problem that the device becomes complicated and expensive.

[Conventional technology]

The problem of connection in the high-efficiency two-dimensional encoding system will be described with reference to FIG.

The image data read by line scanning is encoded line by line, and a block end signal EOFB (End of Faximil
i Block) and pad bits are added and transmitted.

FIGS. 3 (a) to 3 (1) show the structure of the coded image data A having an 8-bit structure. The first line 1 is obtained by coding the immediately preceding reference line as an all-white line, and the second line. The line 2 to the final line 3 are encoded by referring to the immediately preceding line, the EOFB signal 4 is represented by 000000000001000000000001 following the final bit 3a, and the pad bit 5 is composed of the above image data in byte units. "0" is written in the added bits as shown below.

Even if the EOFB signal 4 (24 bits) of the image data A having the above-mentioned configuration is deleted, it is in a byte unit. If the image data B is directly connected as shown in FIGS. In the method, since pad data 5 cannot be identified because it is a series of variable-length data and does not include a line synchronization signal, the last line 3 and pad bit 5 of image data A are referred to by the first line 6 of image data B, and a restoration error occurs. Become.

Note that in other two-dimensional coding methods such as MH and MR methods, the pad bit 5 can be identified as a fill as described above, and the pad bits 5 can be combined by the above method.

On the other hand, as a general method that can be combined regardless of the encoding method, there is a method of restoring and combining the image data, and a block of a facsimile apparatus having a conventional image data combining function shown in FIG. 3B below. This method will be described with reference to the drawings. That is, when combining encoded image data, the file 17
When the image data B is read after the image data A and continuously input to the restoration unit 13, the image data A and B restored to the original image signal are input to the encoding unit 12 via the switching unit 11 and It is combined and encoded as a set of blocks.

In FIG. 3 (b), 9 is a reading unit, 10 is a recording unit,
Reference numeral 15 is a memory, and 16 is a communication control unit including a modem and a network control unit.

[Problems to be solved by the invention]

As described above, in combining high-efficiency two-dimensional encoded image data, there is a problem that the apparatus is complicated and expensive in the method of restoring, combining and then encoding again.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides an apparatus that performs encoding processing of encoded image data and combines them.

[Means for solving problems]

For the above purpose, the present invention eliminates the end signal (4) and the pad bit (5) added to the last bit (3a) of the first image data as shown in FIG. , A processing means (21) for adding an all-white line code (20) represented by a horizontal mode to the final bit (3a), and the first image data processed by the processing means (21) in byte units. Adding means (23) for adding to the first image data an all-white line code (22) represented by a vertical mode so that the first image data processed by the adding means (23) To the second image data.

[Action]

The first image data is combined image data, and the second image data is combined image data.

The present invention inserts an all-white line, which is a reference line of the first line of image data to be combined, between the combined image data and the combined image data, and deletes the ROFB signal and pad bit of the combined image data. At the same time, the all-white line code in the horizontal mode and the all-white line code in the vertical mode are added.

That is, since the horizontal mode does not require a reference line, an all white line can be added regardless of the combined image data, and when the reference line is an all white line, the all white line code in the vertical mode is encoded by 1 bit. Therefore, the same function as the conventional pad bit can be provided.

As a result, although a plurality of white lines are inserted between the combined image data, there is an effect that the coding process is easy and can be applied to another two-dimensional coding method.

Details of the combining method of the present invention will be described below with reference to FIG.

The high-efficiency two-dimensional coding method is a continuous coupling of data lines composed of variable-length codes, and refers to the immediately preceding line as a coding mode (1) pass mode, (2)
This is a two-dimensional encoding method that is composed of the vertical mode and the horizontal mode (3) specified in the encoding line.

In each mode of FIG. 3 (c), a0 is a starting pixel for encoding. At the beginning of encoding, a0 is placed on the virtual white changing pixel immediately before the first pixel of each line.
Then, during encoding, the position of a0 is defined by the immediately previous encoding mode.

In FIG. 3 (c), the vertical mode is to the left of a1 as shown in (a)-(1).
If b2 does not exist, the relative distance between a1 and b1 is 3
If it is within the range, a1 to b1 are represented by a code.

In V (0) (reference numeral "1") in this vertical mode, a1 exists immediately below b1 and represents the same color as the reference line up to b1.
Therefore, when the reference line is an all-white line, the coded line can be represented as an all-white line by "1".

In the horizontal mode, as shown in (a)-(2), when the relative distance pixel number between a1 and b1 is 3 or more, a0 changes to a1 and the next change point a2.
Up to H (code “001”) + M (a0a1) + M (a1a2), where M () is the run length of the corresponding section.

The run length is represented by mode code + makeup code (64 to 1728 pixels) + terminating code (63 pixels or less), and is encoded for each white and black run length.

In the case of A4 size (1728 pixels), if all white lines are encoded in the horizontal mode according to the above run length encoding, [001] ... horizontal mode [010011011] ... white 1728 [00110101] ... white 0 [0000110111] ... black 0 Becomes

As described above, the present invention uses the EOFB of the combined image data A.
The signal and pad bits are deleted, the all-white line code represented in the horizontal mode is added to the last bit, and V
The (0) code is inserted so that the data block becomes a byte unit, and the final line can be a white line regardless of the content of the image data A.

〔Example〕

The details of the present invention will be described with reference to an example of combining two sets of encoded image data A and B.

FIG. 2 (a) is a block diagram of the facsimile apparatus of the embodiment, and 19 is a combination processing unit for deleting the EOFB signal and pad bit of the image data A and adding the horizontal mode all white line. (21) and vertical mode all-white line adding means (23), which reads the image data A and B from the file 17 and sequentially stores them in the memory 15 to perform the above processing and combine them, 18 is a horizontal mode and A white line code table storing the all white line codes in the vertical mode, which is referred to by the combining processing unit 19, 20 is an operation unit for inputting a combining command, and the same reference numerals as those in FIG. 3 (b) Represents the same object.

The combining operation will be described below with reference to the combining operation flowchart of FIG.

When the combined image data name, the other party's telephone number, etc. are specified by the operation unit 20, the combination processing unit 19 is activated.

(1) The image data A is sequentially read from the file 17, the EOFB signal is detected, and the storage of data below the EOFB signal is stopped.

(2) The horizontal mode all-white line code, that is, the code of horizontal mode code + white 1728 + white 0 + black 0 is read from the white line code table 18 and sequentially stored following the last bit of the memory 15.

(3) V is stored in the memory 15 in byte units, and when the stored data is not configured in byte units, V
(0) Code, "1" is stored.

(4) Subsequently, the image data B is read from the file 17 and stored in the area of the memory 15 following the above data.

By the above operation, the combined image data A + B is stored in the memory 15 and is transmitted to the other party according to the instruction or stored in the file 17.

In the above embodiment, the combination of the image data in the file 17 has been described. However, the image data in the file 17 can be combined with the image data obtained by reading the document by the reading unit 9 in the same manner. It can also be implemented in a computer system.

In addition, in the block diagram of FIG.
The main control unit 14 and the white line code table 18 can be included in the memory 15.

〔The invention's effect〕

As described above, the present invention combines coded image data by a simple coding process, and has a great effect in facsimile communication.

[Brief description of drawings]

FIG. 1 is a diagram for explaining the principle of the present invention, FIG. 2 (a) is a block diagram of a facsimile apparatus according to an embodiment, FIG. 2 (b) is a flowchart of a combining operation, and FIG. 3 (a) is a conventional two-dimensional encoding. FIG. 3 (b) is a block diagram of a facsimile apparatus having a conventional image data combining function, FIG. 3 (c) is an explanatory view of an encoding method, and (1) is a vertical mode, (2) is a horizontal mode. In the figure, 1 and 6 are the first line, 2 is the second line, 3 is the final line, 4 and 7 are end signals, 5 and 8 are pad bits, 9 is a reading unit, 10 is a recording unit, and 11 is a switching unit. , 12 is an encoding unit, 13 is a restoration unit, 14 is a main control unit, 15 is a memory, 16 is a communication control unit, 17 is a file, 18 is a white line code table, 19 is a join processing unit, 20 is an operation unit, Is.

Claims (1)

[Claims] 1. An image data combining device for combining first and second image data respectively encoded by a two-dimensional encoding method, which is added to the last bit (3a) of the first image data. A processing means (21) for deleting the end signal (4) and the pad bit (5) present, and adding an all white line code (20) represented by a horizontal mode to the final bit (3a); An adding means (23) for adding to the first image data an all-white line code (22) represented by a vertical mode so that the first image data processed by (21) is configured in byte units. An image data combining device comprising: a combining unit that combines the first image data and the second image data processed by the adding unit (23).