A spatial domain variable block size luma dependent chroma compression algorithm
Summary
The article presents a spatial-domain approach to chroma compression by modeling Cr as a linear function of Y within per-block regions, enabling compact encoding with block-size adaptation. It details the math for deriving C1 and C2 from Ymin and Ymax, discusses variable block sizes and a simple deblocking strategy, and provides results at different chroma bits-per-pixel targets along with notes on future improvements and an experimental codebase.