High efficiency coding of two level mixed natural images for image transmission - identifying input signals and digitising before image synthesis and coding processing into final form

摘要

A high efficiency coding process is used for mono or colour images of the type transmitted over a communication line. The image signals are received by an input unit (1) generating blocks of data (5) transmitted to a character recognition circuit (9) and a difference image encoder (4). The recognition circuit output connects to a digitiser (2) with output to a synthesiser (3), an encoder for two level images (5) and an encoder (6). The data generated are received by an output circuit. USE/ADVANTAGE - High efficiency coding of mono and colour images. Low loss in image quality even with images having very blunt edges.