A novel method of directional image coding on the wavelet transform domain is devised for efficient compression of image data: Directionally decomposed (=filtered and decimated)versions of an image are obtained by manipulating the wavelet transform coefficients, and then the coefficients of a each version ae segmented into vectors of reasonable dimension, and finally the segmented vecotrs are quantized based on the gain-shape vector quantization. The proposed emthod yields excellent quality of reconstructed images at very low bit rates, much better than JPEG or other transform domain vector quantization algorithms.
展开▼
