STILL PICTURE COMPRESSION BASED ON PSYCHOVISUAL IMAGE-PATTERN CODING

In this paper, an approach that integrates different compression techn iques is presented. The goal is to reach high compression rates for st ill pictures without introducing relevant visual distortions in the im ages. This is obtained by using a ''second generation'' compression sc heme which adaptively uses different psychovisual techniques to reduce the image bitrate. Each image is analysed on a block by block basis a nd the most appropriate coding strategy is selected according to the c haracteristics of the current block and of surrounding blocks. Taking into account surrounding blocks leads to improved visual image quality . Another important feature of the proposed approach is that part of t he approximation job is done at the receiver thus further reducing the bit rte needed for transmission.