Reversible discrete cosine transform (DCT) for lossless-lossy image data compression

摘要

A reversible discrete cosine transform (DCT) is described in an image data compression system. The system may include a decompressor with a reversible inverse DCT for lossless decompression or a legacy decompressor with an inverse DCT for lossy decompression. The use of reversible block-based transforms are also described.