PROCESS AND DEVICE FOR TRANSFORMATION OF IMAGE DATA

摘要

A video signal processing system includes encoder apparatus applying a Discrete Cosine Transform (DCT) to NxN (e.g., 8x8) image data blocks. Resulting DCT coefficients are further transformed by multiplying them with a special transform matrix of predominantly zero values. A comparator determines whether the original DCT coefficients or the further transformed DCT coefficients will be coded for data compression, with respect to static or dynamic image content. Complementary transformation is performed at a decoder.