Intra-Residual Weight Grid DCT/DST for BC7/ASTC (opens in new tab)

This method uses neighboring blocks to predict the weight grid of the current block, before applying a forward 2D DCT/DST to the weights, quantizing the coefficients, and coding them\. The current prototype creates weight predictions using a small neighborhood of already coded/decoded blocks to predict the current block's weight grid\(s\)\. See this thread on X here for more details: It's the next step after XUASTC LDR's absolute weight grid DCT , which didn't use predictions \(making it JPE...