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Method of Image Processing Controlled by Number of Scan Print Lines Being Specified

IP.com Disclosure Number: IPCOM000052918D
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 7 page(s) / 204K

Publishing Venue

IBM

Related People

Kida, M: AUTHOR [+2]

Abstract

In a facsimile system, as shown in Fig. 1, wherein a physical page of patterns to be transmitted is optically scanned and then temporarily stored in a work buffer of compressor/decompressor (COM/DEC) in the form of digital raw image which is further compressed and then stored in an image buffer of the controller's RAM (random-access memory) for transmission in the form of digital codes forming a logical page of the patterns which is terminated by an End of Page (E0P) code, the scanning and compressing of the physical page is controlled by the controller's program specifying the number of lines to be scanned, through a special interface between the controller and the COM/DEC to prepare various kinds of logical pages.

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Method of Image Processing Controlled by Number of Scan Print Lines Being Specified

In a facsimile system, as shown in Fig. 1, wherein a physical page of patterns to be transmitted is optically scanned and then temporarily stored in a work buffer of compressor/decompressor (COM/DEC) in the form of digital raw image which is further compressed and then stored in an image buffer of the controller's RAM (random-access memory) for transmission in the form of digital codes forming a logical page of the patterns which is terminated by an End of Page (E0P) code, the scanning and compressing of the physical page is controlled by the controller's program specifying the number of lines to be scanned, through a special interface between the controller and the COM/DEC to prepare various kinds of logical pages.

In an output operation, a logical page in the image buffer which has been compressed and sent by the other image source is decompressed and then printed out in various forms of the physical page through the interface being controlled by the number of print lines specified.

A scanner (SCNR) and a printer (PTR) are connected to a controller through the compressor/decompressor (COM/DEC) via an input/output (I/O) bus and a direct memory access (DMA) bus. The COM/DEC is provided with a length counter (LNGTH CTR) and a control register (CTL REG). The DMA bus is used for compressed image transfer between the work buffer in COM/DEC and the image buffer in RAM. The I/O bus is used for command/ status interface communications as defined below.

Command (Controller to COM/DEC): SET LNGTH: This command carries the count of lines to be scanned or printed in order to store it in the LNGTH CTR. SET CTL REG: FLAG(s) to be set in CTL REG is carried by this command. The flags are defined as follows: FLAG 1: Line Count Specify FLAG 2: Generate End of Page (EOP) code at specified line counts reached or trailing edge reached FLAG 3: Fine Image Resolution Mode (FLAG 3: Normal Resolution Mode) START SCAN: COM/DEC is requested to start scanning of original copy and compressing image. In reference to FLAG 3, the COM/DEC makes decision as to what compressed ; image is prepared in the image buffer. START PRINT: COM/DEC is requested to start decompressing image and printing it. With reference to FLAG 3, the COM/DEC makes decision as to what compressed image is available in the image buffer. PAPER CUT: COM/DEC is requested to cut paper at printer station. If FLAG 1 is set, the paper is cut after it is fed through the distance set in LNGTH CTR. Status (COM/DEC to Controller) SP LNGTH REACHED: If FLAG 1 is set, LNGTH CTR is decremented every line scan and compress or line decompress and print, and when the CTR re...