A Constant Rate Block Based Image Compression Scheme for Video Display Link Applications

摘要

In this paper, we develop an embedded video compression scheme with a constant compression rate to reduce the communication bandwidth on video display links. The basic compression unit is a 2×4 pixel block and all blocks are coded independently to facilitate the function of partial frame update. The proposed embedded compression scheme features an ensemble of compression techniques. These techniques include various spatial domain predictions and vector quantization. The compression ratio of the luminance component is fixed at 2 and those of the two color components are 4. This leads to an overall 3 times constant rate compression. The compression efficiency of the proposed scheme is evaluated based on a set of test images. The achieved PSNR values range from 23.7dB to 38.86dB and the visual distortions are barely noticeable for display on hand held devices.