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by JyrkiAlakuijala
842 days ago
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No bitstream changes. In JPEG XL we have a 3-bit control field for each 8x8 square to guide which pixels participate in smoothing. The heuristics (here https://github.com/libjxl/libjxl/blob/main/lib/jxl/enc_ar_co...) for choosing that value are quite primitive and produces only two values: no smoothing and some smoothing (values 0 and 4). If we replace those heuristics with a search that tries out which of the values is closest to the original, we should get better quality, especially at the lowest bitrates where smoothing is important. |
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