KR100228704B1 - Method of document data coding of facsimile - Google Patents

Abstract

According to an embodiment of the present invention, in a facsimile employing an MMR coding method, when one page of original data is coded, eight white lines are additionally coded, and the last one byte is coded in the coded result. The present invention relates to a method for coding a document data of a facsimile, which is capable of performing an accurate decoding operation even when flushing coding data in order to transmit coding data in byte units.

According to the present invention described above, after coding eight white lines on the remaining bits, the coding data of the last byte can be deleted, thereby transmitting the coded data in the complete byte unit, thereby preventing the decoding error caused by the flushing process of the remaining bits. In addition, there is an advantage that can improve the communication success rate.

Description

Facsimile Coding of Original Data

The present invention relates to a facsimile manuscript coding method, and more particularly, in a facsimile employing the MMR coding method, by coding the last manuscript data and then additionally coding a white line. The present invention relates to a method for coding original data of a facsimile that efficiently removes unnecessary data generated when flushing residual data.

In general, the fax communication technology in the field of data transmission technology employs a communication method of unilaterally transmitting image data to a receiving side through a public switching telephone network (PSTN). Such a facsimile adopts one of an MMR coding method, an MH coding method, and an MR coding method as a method of coding and transmitting original data to a receiving side. These coding schemes are described in detail in T.4 and T.6 of the standards of the International Telegraph and Telephone Consultative Committee (CCITT).

Here, in the MMR coding scheme, there is no EOL (End Of Line) data indicating the end of a line differently from the MH coding scheme and the MR coding scheme. Therefore, when coding a plurality of lines in an MMR method in one page, the coded results are continuously connected without line division.

This continuous coded data is output by byte (Byte-Align), and the last output data does not end with the coding result filling 1 byte, but uses only a few bits. Cases occur frequently. As a result, in order to output data that is not terminated in byte units, it is necessary to fill the remaining bits in which no data is written with meaningless data. This process is called flush.

In the conventional facsimile flushing method, an inverting flush method in which all residual bits are filled with inverted data of the last bit of the coded data, and a residual bit is set to a value of '0' unconditionally regardless of the coded data of the last bit. Non-Inverting Flush method that fills all is mainly used.

For example, when the coding data uses only 2 bits, and the last coding data is '1', when the remaining bits are filled by the inversion flush method, all of the '0' are recorded in the remaining bits as shown in FIG. 1A.

In addition, when the coded data uses only 2 bits and the last coded data is '0', when the remaining bits are filled by the inversion flush method, as shown in FIG. 1B, '1' is recorded in all the remaining bits.

In addition, when only two bits of coding data are used, when the remaining bits are filled by the non-inverting flush method, as shown in FIG. 2, all zeros are recorded regardless of the last coding data.

However, according to the conventional flush method described above, the residual bits are written as '0' in order to output the coded data in byte units (non-inverted flush method) or when the last coded data is '1'. When the residual bits are written as '0' (inverted flush method) and transmitted, there is a problem that a decoding error occurs because the flushed bits are not normal coded data when decoding at the receiver.

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to provide a method for coding a document data of a facsimile to prevent a decoding error caused by a flushing process of residual bits by coding a white line in the residual bits. Is in.

1A and 1B are diagrams showing coded data coded by inverted flush in a facsimile employing a conventional MMR coding scheme.

2 is a diagram showing coding data coded by non-inverting flush in a facsimile employing a conventional MMR coding scheme.

3 is a schematic block diagram of a facsimile applied to the present invention,

4 is a flowchart illustrating an operation of a method of coding a document data of a facsimile according to the present invention.

5 shows coded data coded by the present invention.

<Description of the code | symbol about the principal part of drawing>

1: CPU 2: Memory

3: operation panel 4: scanner

5: Modem 6: Network Control Unit (NCU)

7: Printer 8: Sensor

A feature of the present invention for achieving the above object is a method of coding an original data of a facsimile employing an MMR coding method: a coding step of coding original data for one page; An additional coding step of additionally coding a pattern in which the same information is continuous when coding of the original data for the one page is completed; And a page end display step of data-recording a predetermined recognition code indicating the end of the page when the additional coding is completed.

In the above aspect of the present invention, preferably, the pattern to be further coded comprises a white line; At this time, the white line includes at least eight or more.

Optionally, before performing the coding step, the method may further include an initialization step of initializing a paged coding environment.

Optionally, after performing the additional coding step, the method may further include a deleting step of deleting the coding data of the last byte of the coding data of the additional coded byte unit.

Optionally, after performing the end-of-page display step, it is determined whether there is another original to be coded, and the coding operation is terminated if the other original does not exist, and if the other original exists, the end of the page from the initialization step. The method may further include a determining step of repeatedly performing the display step.

Hereinafter, a preferred embodiment of a facsimile manuscript data coding method according to the present invention will be described in detail with reference to the accompanying drawings.

3 shows a schematic block diagram of a facsimile according to the present invention.

Referring to FIG. 3, the central processing unit 1 for controlling the system according to a predetermined program, program data, protocol data, text data, and the like are stored, and data is accessed by the control of the central processing unit 1 (Access Memory unit 2 or a plurality of keys capable of generating key data of the system, and when the key data is generated, it is input to the central processing unit 1 and the display data of the central processing unit 1 is displayed. OPE (Operation Panel) 3 including a display device, a scanner 4 which scans an image of an original and converts it into digital image data and provides it to the central processing unit 1; The modem 5 modulates and outputs the output data of the central processing unit 1 in the analog form under the control of the processing unit 1, and demodulates and outputs the analog input signal. Follow Dong And receive data by a control signal from the central processing unit 1 and the Network Control Unit (NCU) 6 which forms a call loop of the telephone line and interfaces the signals of the modem 5 and the telephone line. A printer 7 for printing and a sensor unit 8 for sensing the remaining amount of recording paper or for detecting a document and providing it to the central processing unit 1.

The operation of the present invention having the configuration as described above will be described with reference to FIGS. 4 and 5.

First, when an original is input and a user inputs an original data transmission command of the operation panel 3, the sensor unit 8 detects that there is an original and outputs a signal indicating that an original exists in the central processing unit 1. do. Accordingly, the central processing unit 1 drives a feed motor to transfer the originals to the reading area. When the original is transferred to the reading area, the scanner 4 reads the image of the original, and the read original data is sequentially stored in the memory unit 2.

Thereafter, the central processing unit 1 switches to the preparation mode for performing the MMR coding operation (S1). Then, after initializing the page unit coding state of the facsimile (S2), the original data for one page is coded according to the MMR coding method. The coded data coded in this way is sequentially stored in the memory unit 2.

Thereafter, it is checked whether coding of original data for one page is completed (S3). When coding of the original data for one page is completed in this step 3 (S3), the central processing unit 1 controls the scanner 4 to code the white line (S4). According to CCITT T.6, if the previous line is a white line, the white line is coded so that the value is '1'. This process is repeated for eight white lines, and when coding for eight white lines is completed (S5), one byte is deleted from the coded result (S6).

Here, the reason why the white line is repeatedly performed eight times is that data for one line occupies at least one bit when coding the white line. As noted, eight white lines must be coded.

In addition, the reason for deleting one byte from the coded result is that, when coding data uses only a few bits, coding eight white lines fills up to several bits of a new one byte. Therefore, by deleting the coded data area that does not affect the actual data (see FIG. 3), the coded data in units of complete bytes can be transmitted.

After performing step 6 (S6), the central processing unit 1 additionally records an end-of-facility block (EOFB) indicating the end of one page (S7), thereby completing the coding of one page. Thereafter, the central processing unit 1 checks whether there is another page to be coded (S8), and if another page exists, returns to the above step 2 (S2) and repeats all the processes after step 2 (S2). If no other page exists, the coding operation ends (S9).

Then, when the coding operation of all the pages is completed, the central processing unit 1 detects the coding data stored in the memory unit 2, and transmits the coding data via the modem (5). This coded data is modulated in analog form by the modem 5 and then transmitted to the receiving side via the NCU 6.

Then, when the fax data is transmitted from the outside, the printer 7 serves to print the fax data.

On the other hand, the present invention has been limited to the addition of eight white lines after the manuscript data of one page unit is coded, this additional coding data is replaced with a coded arbitrary pattern having regular information can do.

In addition, although the number of additionally coded lines is limited to eight, the eight or more lines may be additionally coded. This means that when one page of coded data is transmitted and printed on the receiving side, decoding the additional coded data is in a range outside the recording area of the recording paper, and thus has no effect on the recording paper in the printing state. .

It is apparent that the definition of the method of replacing the additional coding data and the number of additional lines described above can be easily modified by a person of ordinary skill in the art.

As a result, as described above, according to the facsimile manuscript data coding method according to the present invention, after coding eight white lines on the remaining bits, the coding data of the last byte is deleted, thereby generating a decoding error due to the flushing of the remaining bits. There is an advantage that can prevent, and improve the success rate of communication.

Claims (6)

In facsimile document coding method using MMR coding method: A coding step of coding original data for one page; An additional coding step of additionally coding a pattern in which the same information is continuous when coding of the original data for the one page is completed; And And a page end display step of data-recording a predetermined recognition code indicating the end of the page when the additional coding is completed. The method according to claim 1, wherein the pattern to be further coded, A method of coding an original data of a fax including a white line. The method according to claim 2, wherein the white line, A facsimile document coding method comprising at least eight or more. The method according to claim 1, before performing the coding step, A method for coding an original data of a facsimile further comprising an initialization step of initializing a page-based coding environment. The method according to claim 1 or 4, after performing the additional coding step, And deleting the coded data of the last byte among the coded data of the additional coded byte unit. The method of claim 5, wherein after performing the end-of-page display step, Determining whether there are other originals to be coded, and if the other originals do not exist, ending the coding operation; Facsimile Coding of Original Data.

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