KR970003403B1 - Control method of facsimile - Google Patents

Abstract

The method is for controlling shortening of data transmission time in a facsimile machine. The method includes: a memory checking step of checking whether or not a transmitting line memory(3) is vacant; a data storing step of storing a read data for a next line at a block memory(9a) having a buffer capable of storing an image data over two lines if the line memory(3) is not vacant from the checking step; and a compression and coding step of compressing and coding one line image data stored in the block memory(9a) to store the compressed and coded image data if there exists a read and stored image data during the memory storing step.

Description

How to control faster fax data transfer time

1 is a block diagram showing the configuration of a facsimile.

2 is a block diagram of a conventional facsimile compression and coding unit.

3 is a flowchart illustrating a conventional facsimile data transmission control process.

4 is a block diagram of a facsimile compression and coding unit according to the present invention.

5 is a flowchart showing a facsimile data transmission control process according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Reading part 2: Compression and coding part

3: transmission line memory 4: modem

5: Telephone network control unit 6A: Central processing unit

7A: Compression and Restoration Processing Unit 8A: Interface

9A: Block memory for storing image data

10A: Interface

The present invention relates to a method of controlling a data transmission of a facsimile, and more particularly, to a method of controlling a facsimile data transmission time shortened by allowing a compressed data transmission operation of a modem and an original data read operation to be executed in parallel. .

As shown in FIG. 1, the fax includes a reading unit 1 for reading image information of an original as an electrical signal, and a compression and coding unit for compressing and coding image data read from the reading unit 1. (2), a transmission line memory 3 in which data compressed by the compression and coding unit 2 is stored, a modem 4 for modulating data stored in the transmission line memory 3, and It is composed of a network control unit 5 for transmitting the data output from the modem (4) through the telephone network.

Referring to the transmission operation of the original in the facsimile of such a configuration, the image information of the original is read from the reading unit 1 and output image data, and the compression and coding unit 2 compresses and codes the image data to transmit the line memory ( 3), and the modulator 4 changes the data stored in the line memory 3 and transmits the data to the other party's facsimile through the telephone network controller 5.

Referring to the conventional circuit configuration of the data compression and coding unit 3 in such a facsimile, as shown in FIG. 2, the central processing unit 6 that performs compression and coding control, and the central processing unit 6 A compression and decompression processing section 7 for performing data compression and decompression under control, an interface 8 of the compression and decompression processing section 7 and a line memory 9 for storing image data, and the data to be compressed It consists of a line memory 9 to be stored, and an interface 10 of the central processing unit 6 and the line memory 9, and the conventional facsimile data transmission control process by the Zoel data compression and coding unit of this configuration A description with reference to FIG. 3 is as follows.

The central processing unit 6 detects the end of the read data (PAGE END) from the read unit 1, and if there is line data read out, the transmission line memory 3 checks whether the transmission line memory 3 is empty (EMPTY).

If the transmission line memory 3 is not empty, since the modulation operation by the modem 4 is still in progress, the CPU 6 waits while the transmission line memory 3 becomes empty. One-line read image data is stored in the line memory 9 for storing image data through the interface 10.

Subsequently, the central processing unit 6 issues a data compression command to the data compression and decompression unit 7, and the compression and decompression unit 7 which receives the command reads the data of the line memory 9 through the interface 8. Compressed data is compressed, and the compressed data is coded and stored in the transmission line memory 3.

This operation is repeated to the final line of the read document to perform compression, coding and transmission of image data.

That is, the conventional facsimile data transmission control method uses one line compression, coding, and coding of one line read and read originals when the transmission line memory 3 is empty, that is, when the modulation operation by the modem 4 is completed. The image data is transferred through the steps leading to the storage of the image data (line memory 3).

Therefore, according to the conventional facsimile data transmission control method, since the compression is performed after reading one line every time transmission on one line is completed, the data is present in the modulation process by the modem (transmission line memory 3). 1 line read and data compression / coding operations are not executed, resulting in a longer data transfer time, which increases the modem speed or 1 line read speed. Even if it does, the improvement of the overall data transfer rate is limited, and thus, the facsimile data transfer processing time becomes long, and thus the system performance is deteriorated.

In other words, the transmission time for one line under the condition that the amount of compressed data is excluded is 1 line read time-data compression time + modem transmission speed (1 hour) = 1 line transmission time, among which 1 line read time. Is determined by a drive system structure such as a read unit and a read chip (CIS / CCD), and the speed of the drive system and the read device is required to reduce the read time of one line, which increases the price.

In addition, even if the modem's transmission speed is increased to a high speed, it is limited to the modem's speed improvement. For example, if one line read time = 5 msec, data compression time = several hundred μsec, and modem speed = 5 msec / 11ine, The transmission time is at least 10 msec / 11ine.

The present invention includes a block memory capable of storing two or more lines of image data read from an original, and includes an operation of storing image data of a read line in the block memory, a data type of a transmission line memory to be provided to a modem, Reduces the time required for facsimile data transfer by reducing the time required for facsimile data transfer by performing a series of operations in parallel, such as retrieving nothing, compressing and coding data in the block memory, and providing it to the line memory for transmission. It is an object to provide a control method.

4 shows a configuration of a data compression and coding unit for the present invention.

Referring to FIG. 4, the data compression and coding unit 2 according to the present invention compresses image data under the control of the central processing unit 6A and the central processing unit 6A, which proceed with the procedure of FIG. 5. And a data compression and decompression unit 7A for restoring, an interface 8A of the compression and decompression unit 7A, an image data storage block memory 9A, and read image data of two or more lines. A block memory 9A for storing image data, and an interface 10A between the CPU 6A and the block memory 9A for storing images.

The data compression and coding unit 2 configured as described above is applied to the facsimile circuit shown in FIG. A memory search step for searching whether 3) is empty, and if the line memory 3 for transmission of the search result of the memory search step is not empty, the modem assumes that it is transmitting compressed data for one line and immediately goes to the next line. The data storing step of storing the read image data of the originals in the image data in the block data 9A for storing the image data, and the line memory 3 for transmitting the search result of the memory retrieving step is empty, If there is image data, the single-line image data in the block memory 9A for image data storage is compressed and It consists of compression and coding steps that are coded and stored in the transmission line memory 3.

Meanwhile, referring to FIG. 5 as an embodiment of the present invention,

The memory retrieval step includes the steps of determining whether or not the final line of the read document to be transmitted is determined, and determining whether or not there is data in the transmission line memory 3 when the result is not the final line.

The data storing step may include searching for the presence or absence of image data already read if the line memory 3 for transmitting the search result of the memory searching step is empty, and image data if there is no image data read from the search result. Searching for the presence or absence of a buffer that can be stored in the storage block memory 9A; and if there is an empty buffer in the block memory 9A for storing the image data as a result of the buffer presence search, one-line read is performed to read the read image data. Storing in the block data 9A for storing image data, and after the storing, reducing the number of buffers capable of storing image data and increasing the number of image data lines.

The compressing and coding step may include searching for the presence or absence of the read image data when the line memory 3 for transmitting the search result of the memory search step is empty; Compressing and coding one-line image data in the block memory 9A for data storage and storing it in the line memory 3 for transmission, and after storing the number of buffers that can be stored in the block memory 9A for image data storage. The step of increasing and decreasing the number of read image lines is performed.

On the other hand, as a result of the determination of the final line of the read document to be sent in the memory retrieval step, in the case of the final line, the presence or absence of data remaining in the image data storage block memory 9A is searched for and left on the remaining image data. Perform the compression and coding steps.

Hereinafter, a facsimile data transmission time reduction control method of the present invention is executed with reference to the accompanying drawings.

First, the central processing unit 6A determines whether the original read out from the reading unit 1 is the final line (the end of the original; PAGE END).

If the determination result is not the last line, it is determined whether the transmission line memory 3 is empty. If the determination result is that the transmission line memory 3 is empty, the transmission of the compressed and coded data by the modem 4 is completed. Then, it is searched if there is image data read in the block memory 9A for image data storage.

When there is image data read out as a result of the search of the block memory 9A for storing image data, the central processing unit 6A issues a data compression command to the data compression and decompression unit 7A, and receives and decompresses the data. The unit 7A reads, compresses and codes one image data line in the image data storage block memory 9A through the interface 8A, and stores the coded data in the transmission line memory 3.

The central processing unit 6A increases the number of buffers capable of storing image data by +1 in the block memory 9A for storing image data, and decreases the number of read lines by -1 and then determines whether the final line is again. Run from step.

On the other hand, when the transmission line memory 3 is empty and there is no image data read in the image data storage block memory 9A, or data still remains in the transmission line memory 3 (modulation is being executed). The central processing unit 6A searches whether there is an empty buffer capable of storing image data in the block memory 9A for storing image data.

As a result of this search, if there is an empty buffer, the central processing unit 6A executes one line reading, and the read one line of image data is stored in an empty buffer of the block memory 9A for storing image data through the interface 10A. Save it.

The central processing unit 6A decreases the number of buffers capable of storing image data by one, increases the number of image data lines by one, and executes again from the step of determining whether the transmission line memory 3 is empty. .

In other words, the method for controlling the facsimile data transfer time according to the present invention stores image data in an empty buffer in the image data storage block memory 9A when the transmission line memory 3 is not empty. As soon as (3) is emptied, the image data (one read data line) stored in the buffer in the image data storage block memory 9A is compressed and coded by the data compression and decompression unit 7A for transmission and line coding. The operation recorded in (3) is processed in parallel at the same time.

On the other hand, when this operation is continued and the final line of the read document is reached (PAGE END), the central processing unit 6A searches whether image data already read and stored in the image data storage block memory 9A remains.

If the image data read out is left as a result of this search, wait until the transmission line memory 3 is empty, and when the transmission line memory 3 is empty, compression and coding are performed on the remaining image data. Since data is recorded in the transmission line memory 3, the image data for the original is transmitted without missing to the final read line.

As described above, the facsimile data transmission time reduction control method of the present invention transmits the facsimile data in such a manner that the transmission, reading, compression, and coding operations of the modem are performed in parallel, thereby enabling high-speed data transmission. It is possible to shorten the data transmission time, thereby providing a high performance facsimile, and to improve the data processing efficiency and speed in a facsimile of the same speed of the reading part and the modem.

Claims (5)

A memory search step of searching whether the transmission line memory 3 is empty, and if the transmission line memory 3 of the search result of the memory search step is not empty, it is regarded that the modem is transmitting compressed data for one line. And immediately storing the read image data of the original for the next line in an image data storage block memory 9A having a buffer capable of storing two or more image data, and transmitting the search result of the memory retrieval step. If the credit line memory 3 is empty and there is image data read and stored in the data storage step, the line memory 3 for transmission is compressed and coded by one-line image data in the block memory 9A for image data storage. Reduced facsimile data transmission time, consisting of compression and coding results stored in Control method. The method of claim 1, wherein the memory retrieval step includes: determining whether or not the final line of the read document to be transmitted is determined; and determining whether or not there is data in the transmission line memory (3) when the result is not the final line. A method for reducing facsimile data transmission time, characterized in that. The method of claim 1, wherein the storing of the data comprises: searching for the presence or absence of image data already read when the line memory 3 for transmitting the search result of the memory searching step is empty; If there is no or if there is data in the memory 3, searching for the presence or absence of a buffer that can be stored in the image data storage block memory 9A, and if the buffer existence result is empty in the block memory 9A for image data storage. Storing the read image data in the block memory 9A for storing image data by executing one-line reading when there is a buffer, and after the storing, reduces the number of buffers that can store image data and increases the number of image data lines. And controlling the facsimile data transmission time. The method of claim 1, wherein the compressing and coding comprises: searching for the presence or absence of read image data when the line memory 3 for transmitting the search result of the memory searching step is empty; Compressing and coding one-line image data in the image data storage block memory 9A and storing it in the transmission line memory 3, and storing the image data in the image data storage block memory 9A. And increasing the number of possible buffers and reducing the number of read image lines. 3. The method according to claim 2, wherein in the memory retrieval step, a determination is made as to whether or not the final line of the read document to be transmitted is found. In the case of the final line, the data remaining in the image data storage block memory 9A is searched for and left. A method for reducing facsimile data transmission time, comprising the steps of compressing and coding a data present in the same data.