1. 09 Mar, 2016 2 commits
    • Jingning Han's avatar
      Fix an assertion condition in transform type search · 02734b64
      Jingning Han authored
      Change-Id: I442475e559be2acdc1c2a3e5ca021b3de77adda5
    • Jingning Han's avatar
      Add horizontal and vertical scan order for 1-D transform · e0413094
      Jingning Han authored
      This commit enables the 1-D transform to use Manhattan grid vertical
      and horizontal scan order for transform coefficient entropy coding.
      Enabled in inter prediction mode, the hybrid 1D/2D transform coding
      scheme outperforms the 2D-DCT based coding system used in VP9 by
      lowres_all  1.7%
      hdres_all   1.4%
      As one coding option, in addition to the existing 17 other transform
      types in ext-tx experiment, the 1D/2D hybrid transform improves
      the coding gains:
      lowres_all  2.2% -> 3.0%
      Change-Id: I9cefa9d9e38224546d0afd67feecd9f8d4a16ab0
  2. 07 Mar, 2016 1 commit
    • Jingning Han's avatar
      Hybrid 1-D/2-D transform coding · a8dc9694
      Jingning Han authored
      This commit enables a hybrid 1-D/2-D transform coding scheme and
      the accompany entropy coding system. It currently uses hybrid
      1-D/2-D DCT transform coding. It provides coding performance gains:
      lowres_all  0.55%
      hdres_all   0.43%
      Change-Id: I2b30dcafd21eb2bb3371f6e854cbab440a4dfa78
  3. 03 Mar, 2016 1 commit
  4. 02 Mar, 2016 4 commits
  5. 01 Mar, 2016 6 commits
  6. 29 Feb, 2016 3 commits
    • Yunqing Wang's avatar
      Do sub-pixel motion search in up-sampled reference frames · 342a368f
      Yunqing Wang authored
      Up-sampled the reference frames to 8 times in each dimension using
      the 8-tap interpolation filter. In sub-pixel motion search, use the
      up-sampled reference frames to find the best matching blocks. This
      largely improved the motion search precision, and thus, improved
      the compression quality. There was no change in decoder side.
      Borg test and speed test results:
      1. On derflr set,
      Overall PSNR gain: 1.306%, and SSIM gain: 1.512%.
      Average speed loss on derf set was 6.0%.
      2. On stdhd set,
      Overall PSNR gain: 0.754%, and SSIM gain: 0.814%.
      On hevchd set,
      Overall PSNR gain: 0.465%, and SSIM gain: 0.527%.
      Speed loss on HD clips was 3.5%.
      Change-Id: I300ebaafff57e88914f3dedc8784cb21d316b04f
    • Debargha Mukherjee's avatar
      A build fix and some other cosmetic changes · db084506
      Debargha Mukherjee authored
      Fixes some issues introduced by a merge of two patches.
      Also decouples the temporal interpolation filter from the switchable
      filters for now for ease of experimentation with both separately.
      Change-Id: If1c7c08adf00e0cf818fe8d0d3656c26ea65eb32
    • Debargha Mukherjee's avatar
  7. 27 Feb, 2016 3 commits
  8. 26 Feb, 2016 10 commits
  9. 25 Feb, 2016 2 commits
  10. 24 Feb, 2016 8 commits