Texture compression with adaptive block partitions

摘要

We present image comression method based block palletizing. Image blick is partitioned into four subsets, and each subset is palletized b 2 or 4 colors from the quasioptimal local palette, constructed for the whole block. Index amp for the whole block, being the union of index maps for subsets, in thus only 1 or 2 bits deep, while the local palette may consists of 8 or even 16 colors. The local palette has a specific geometrical configuration in RGB color space, determined by only 2 colors. These two colors are stored explicitly, and the rest are recconstrcuted at the decompression stage. Compresses block consits, essentially, of the index amp, platete description and partition description, This format allows fsst access to randomly chosen pixels, and high reconstruction quality for compression rations from 8 to 12, which is useful for texture storage in 3D graphics applications where real-time decompression is crucial.