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by TD-Linux
3388 days ago
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Step 3), choosing more zeros, can be generalized with trellis quantization, which does a search for the best values to encode for each block for the best distortion-per-rate score, where distortion can be any metric (edit: apparently guetzli does some sort of whole frame search for this). mozjpeg does trellis with effectively the PSNR-HVS metric. Because the other two steps are only one setting that affects the entire picture, I do wonder how Guetzli would perform if it was just a wrapper around mozjpeg. |
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