The compression of colour images based on a 2-dimensional discrete wavelet transform yielding a perceptually lossless image

摘要

A coding method and apparatus that include splitting raw image data (200) into a plurality of channels (R, G1, G2, B) including color plane difference channels (R-G1, B-G2), and then compressing separately each of these channels using a two-dimensional discrete wavelet transform (210, 212, 214. 216), the compression utilizing quantization, whereby the recovery of the compressed channel data yielding a perceptually lossless image. The method and apparatus operate on images directly in their Bayer pattern form. Quantization thresholds are defined for the quantizing which may vary depending upon the channel and DWT sub-band being processed.