Methods for improving compression of image chroma information using reduced resolution and luma biased chroma quantization parameters

摘要

Methods and computer programs for improving compressed image chroma information include selecting a luminance channel and two or more chroma channels, reducing the resolution of one or more of the chroma channels, applying a quantization parameter (QP) value to at leat one of the chroma channels, the chroma QP being biased with respect to the a QP value applied to the luminance channel. One chroma channel (X') may represent non-visible wavelengths.