A data flow image compression processor

Abstract

This paper presents a binary image data compression and expansion processor that can compress 500 kbytes of image data into 35 kbyles of code data in 0.41 seconds. The pmessor equips with dala flow hardwax and CPU on the one chip. Topics described include the algorithms, anhifp.ture. and perfnmance. Visua-interface belween man and machine is of peat concern today. A large amount of imagc data has to he handled efficiently to imprwe this interface. For cxamplc, when an A4-sirc page of image is scanned at density of 200 pixelginch. the resultant image dam amouns to 500 kbyles. It takes so long as 7 minutes to !"fer this by 9,600 bps MODEM. If requires one diskette to store this on a 2DD 3.5 inch floppy. In order to improve the efficiency, several coding schemes of compressing binary image data were recommended by the CCI'IT' 2. By applying one of the recommended methods, one page of image data can be compressed into 1/14. 35 kbytes of code data (Figure 1). Then one page of image can be transferred within 30 seconds. Thirteen pages of image can be stored on a floppy diskette. But another problem here is that it takes about 15 seconds for a multi-purpose processor to compress one page of image dab.