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Priority-Based Arithmetic Coding for Wavelets

JPEG-2000, the successor to JPEG, is emerging as an attractive candidate for the future de facto image compression standard. However, while it offers superior results over most other image compression techniques, it comes with a long list of features and options, and consequently a highly complex algorithm. We have developed an image coder that can compete with the performance of JPEG-2000 while offering a much simpler design. Priority-Based Arithmetic Coding for Wavelets (PACW) involves a wavelet transform followed by arithmetic coding of bit-planes in a prioritized order, achieving lossy compression of grayscale images that can match, and occasionally outperform, JPEG-2000.