Intra-Residual Weight Grid DCT/DST for BC7/ASTC
A GPU texture supercompression method for BC7/ASTC weight grids: use neighboring already-coded blocks to predict the current block's weights, then 2D DCT/DST-code the residual. 17 predictors; 20-35% reduction in AC coefficients vs. absolute DCT. JPEG-like to WebP-like.








