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There's at least one specific optimization in H.264 (aka "MPEG-4 Part 10") to smooth out these artifacts at block boundaries, called "deblocking". https://en.w
by disqard 2y ago
There's at least one specific optimization in H.264 (aka "MPEG-4 Part 10") to smooth out these artifacts at block boundaries, called "deblocking".
https://en.wikipedia.org/wiki/Deblocking_filter https://en.wikipedia.org/wiki/Deblocking_filter
- iggldiggl 2y agoAnd then there's the current maintainer of libjpeg, who switched the down- and up-scaling algorithms for chroma subsampling to use DCT scaling because that's mathematically more beautiful, which does introduce some additional artifacts at the block boundaries of each upsampled chroma block.