KR950000284B1 - Data size changing device for fax - Google Patents

Abstract

The apparatus converts the size of the document data in matching to a manuscript size of the facsimile of a receiving side, when document contents having different data amount are transmitted and received according to the manuscript size. The apparatus includes a CPU for storing and decoding video information, a memory, a DMA controller, a DMA/data controller, a data buffer, a parallel/series converter, a series/parallel converter, a conversion control clock generator, a conversion mode establishing part, a line counter for judging whether or not one page of a data conversion process of the manuscript is completed, and a clock generator.

Description

Facsimile Document Data Size Converter

1 is a schematic configuration diagram of a conventional facsimile apparatus.

2 is a flowchart of a document data size conversion method of a conventional facsimile apparatus.

3 is a block diagram of a document data size converting apparatus according to the present invention.

4 is a table showing the conversion of document data size in the present invention.

5 is a data processing timing diagram at the time of B4 size A4 size conversion according to the present invention.

* Explanation of symbols for main parts of the drawings

7: CPU 8: Memory

9: DMA controller 10: DMA / data control unit

11: data buffer 12: parallel / serial converter

13: Serial / Parallel Converter 14: Conversion Control Clock Generator

15: size conversion mode setting unit 16: line counter

17: clock generator

The present invention relates to a facsimile document data size converting apparatus which converts the size of document data according to the original size of the receiving side facsimile when the facsimile transmits / receives document contents having a different data amount according to the original size.

The conventional facsimile apparatus includes, as shown in FIG. 1, an optical system 2 for scanning image information of the document 1, an image reader 3 for reading the scanned image information, and An image processing unit 4 for performing pixel density conversion and compression processing, a recording unit 5 for printing the processed image information on an original, and a communication unit 6 for transmitting the processed image information to a receiving side, The image information processing and document data size conversion operation by this are as follows with reference to FIGS.

Image information is inputted through the optical system 2 and the image reading unit 3 in the original 1, and the input image information is converted through the pixel density conversion and data compression process by the image processing unit 4 through the communication unit 6. It is transmitted to the receiving side facsimile or recorded on the paper through the recording unit 5, wherein the image processing unit 4 performs a process of converting the input data amount into a document data size suitable for the original size adopted by the receiving side. . That is, for example, if the input data amount is B4 size and the receiving document is A4 size, B4 document data is converted to A4 document data and transmitted, which is the document data of the original to convert pixel data per line. This method reduces the number of pixels corresponding to the size, and the method is to reduce the number by losing data at a predetermined interval with a certain rule. This operation is performed by starting the conversion program in the image processing unit 4 and has the following process.

First, the document (image) data of the document is read, and a certain number of data are lost from the data (bit processing), the data is stored in a register, and the next data is read to compensate for the format change caused by the lost data. After reconstructing the normal data, the output is shown. For example, if there is data to be lost in 8-bit data read from the image memory, and if there is data, 1 or 2 bits of 8 bits are lost through bit processing to make 6 or 7 bits, and the next data is read. 6- or 7-bit data is reconstructed into 8-bit normal data and outputted. When performing 200 dots of image information per inch, the conversion from A3 to A4 is 2432 pixels → 1728 pixels, and A3 → A4 is 2432 → At 2048 pixels, B4 → A4 reduces the document data size to 2048 → 1728 pixels.

Therefore, in the conventional document data conversion, the image processing unit needs to repeatedly perform the conversion process on all data and re-memorize and transmit them. Therefore, a long time is required for data conversion, and thus the facsimile transmission speed is reduced. There was a problem.

The present invention includes a means for setting an original size conversion mode and a means for loss of data so that the original size is converted according to the conversion mode, thereby reducing the transmission speed and data processing according to the original difference of the transmission / reception facsimile. It is an object of the present invention to provide a facsimile document data size converting apparatus capable of eliminating a drop in speed and enabling high-speed data conversion and communication. The following describes the apparatus configuration of the present invention with reference to FIG.

The document data size converting apparatus of the present invention includes a CPU 7 for controlling storage and decoding of image information, a memory 8 for storing and decoding image information, and a memory 8 associated with size conversion of document data. A DMA controller 9 for controlling image information storage and decoding, a DMA / data controller 10 receiving data from the DMA controller 9, and data to be converted and converted by the DMA / data controller 10; A data buffer 11 in which data is temporarily stored / decoded, a parallel / serial converter 12 for converting the buffer output data into serial data so that the data can be lost, and a serial / parallel which loses some data from the converted serial data. The converter 13, the conversion control clock generator 14 for supplying a control clock to the serial / parallel converter 13 so as to perform data loss processing suitable for the original conversion mode, and the clock generator 14 is the original conversion mode. Corresponding to A size conversion mode setting unit 15 for controlling the clock generation value to perform clock generation / supply, a line counter 16 for determining whether one page of data conversion processing of the original is completed, and the conversion control clock generator 14 And a clock generator 17 for supplying a clock required for data conversion of the parallel / serial converter 12. The document data size conversion operation by this is as follows with reference to FIGS.

First, in FIG. 3, the CPU 7 stores the image data read from the document in the data memory 8 and converts the document data size to be converted into the size conversion mode setting section 15, i.e., from A4 to A4. Download the conversion or the conversion mode value from A3 to B4 or the conversion mode from B4 to A4. This conversion mode value determines that the conversion control clock generator 14 generates a clock at a corresponding timing in accordance with the quantity of data to be lost in each conversion mode as shown in the diagram of FIG. For example, when the parallel / serial converter 12 and the serial / parallel converter 13 are shift rasters, the conversion control clock generator 14 operates as a shift counter. It is determined by the conversion mode value.

When the conversion mode is set in this way, the DMA / data control unit 10 requests the data access to be converted to the DMA controller 9 (Direct Memory Access Controller) (DMA1 REQ active), and the DMA controller 9 recognizes this ( DMA1 ACK Active) The data to be converted from the memory 8 is accessed and stored in the data buffer 11. Under the control of the DMA / data control unit 10, the data D0 to D15 output from the data buffer 11 are input to the parallel / serial converter 12, and the input data is a clock supplied from the clock generator 17. The serial data is converted and output by (SCK). The serial data is converted back into parallel data by the shift control clock PCK outputted in synchronization with the clock SCK from the conversion control clock generator 14, where the shift control clock according to the size conversion mode (PCK) is described. ), The clock PCK is not supplied to the nth data to be lost and no data is output at this timing. The converted data in this way is stored in the data buffer 11 by the DMA / data control unit 10, and after the access request (DMA2 REQ) and recognition (DMA2 ACK) of the converted data are made to the DMA controller 9, The DMA controller 9 accesses the output data of the buffer 11 and stores it in the memory 8. If this operation is described as B4 to A4 conversion, the B4 data inputted as shown in (a) of FIG. 5 is serially converted into the clock (SCK) tie and in (b), where the clock (PCK in The data is lost because the clock PCK is not supplied in the case of data 8 while converting the parallel data by timing. In addition, the data is lost because the clock PCK is not supplied in the data 32 and 33 cases. As described above, the timing of the data to be lost is determined by the size conversion mode setting unit 15 by counting the count value of the conversion control clock generator 14 as described above.

The line counter 16 counts the number of conversions performed one line as described above, and if the number of pages is executed, the line counter 16 completes one line count for one page. It recognizes that the conversion is completed for one page, and ends. This operation is similarly performed for the original on the next page.

As described above, according to the present invention, since the data size conversion, which was conventionally dependent on the S / W of the image processing unit, is performed at a high speed clock, the time required for the conversion can be shortened from 10 seconds to 100 m seconds. It is possible to perform high-speed communication according to the above, and it is possible to easily set a plurality of conversion modes, thereby ensuring convenience and efficiency in device operation and operation.

Claims (1)

A CPU (7) for controlling the storage and decoding of the image information, a memory (8) for decoding the image information, and a DMA controller (9) for controlling the storage and decoding of the image information in the memory (8) associated with the size conversion of the document data; Data to be converted by the DMA / data control unit 10 and the DMA / data control unit 10 that receive data from the DMA controller 9 and the data buffer 11 and buffer output data for temporarily storing / decoding the converted data. Is converted into serial data so that the data can be lost and the serial / parallel converter 13 and the serial / parallel converter 13 which lose some of the data from the converted serial data are converted into the original data conversion mode. A conversion control clock generator 14 for supplying a control clock for proper data loss processing and a clock generation value for the clock generator 14 to perform clock generation / supply corresponding to the original conversion mode. The clock required for data conversion of the conversion converter mode setting unit 15 and the line counter 16 for determining whether the original data conversion processing of one page has been completed, and the conversion control clock generator 14 and the parallel / serial converter 12. The document data size conversion device of the facsimile consisting of a clock generator (17) for supplying.