| 摘要 |
The invention is a new effective and fast method and apparatus for still ima ge compression. The present invention implements an embedded progressive sorting scheme in a quadtree-like structure. In contras t to zerotree-based methods for wavelet coding, the invented embedded quadtree wavelet (EQW) method exploits the inherent spatial self- similarity within individual layers of the multiresolution decomposition hierarchy. This self-similarity offers higher predictability o f the data within the same resolution level, and therefore usually provides a higher performance in seeking a compact code. The computation involved in the EQW method is more efficient than in the zerotree wavelet coding, and the produced bitstream is more robust to channe l noise. The present invention can be effectively used for object-oriented shape coding or region coding in image and video compression coding systems.
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