| commit | 199a2f40522f8912d980fd70f41ccf4d6330fd24 | [log] [tgz] |
|---|---|---|
| author | Urvang Joshi <urvang@google.com> | Mon Jan 23 15:02:07 2017 -0800 |
| committer | Urvang Joshi <urvang@google.com> | Mon Jan 30 17:48:46 2017 +0000 |
| tree | d239386ea6c83f90d46ce3f0ce47c35dad10ed30 | |
| parent | 79c0f32c582eb7c5ca6e2725c759c969036c9587 [diff] |
Palette: Don't use top-right pixel for context of color indices. This reduces the complexity in a number of ways: - We need just 3 neighbors instead of 4. - Possible contexts reduce from 16 to 5. - On hardware side, getting the contexts for a whole block will be more parallelizable. At the same time, compression performance improves very slightly: - Screen-content set (videos) (Google): BDRate improved by 0.32 - screenshots set (images) (AWCY): PSNR improved by 0.62: https://arewecompressedyet.com/?job=palette_withTR2%402017-01-27T21%3A30%3A28.890Z&job=palette_noTR2%402017-01-27T21%3A41%3A34.312Z Change-Id: Ie84ca32f05d55ad481a51c2d3abc579468597189