1. 22 Apr, 2013 1 commit
  2. 26 Mar, 2013 1 commit
    • Deb Mukherjee's avatar
      Implicit weighted prediction experiment · 23144d23
      Deb Mukherjee authored
      Adds an experiment to use a weighted prediction of two INTER
      predictors, where the weight is one of (1/4, 3/4), (3/8, 5/8),
      (1/2, 1/2), (5/8, 3/8) or (3/4, 1/4), and is chosen implicitly
      based on consistency of the predictors to the already
      reconstructed pixels to the top and left of the current macroblock
      or superblock.
      
      Currently the weighting is not applied to SPLITMV modes, which
      default to the usual (1/2, 1/2) weighting. However the code is in
      place controlled by a macro. The same weighting is used for Y and
      UV components, where the weight is derived from analyzing the Y
      component only.
      
      Results (over compound inter-intra experiment)
      derf: +0.18%
      yt: +0.34%
      hd: +0.49%
      stdhd: +0.23%
      
      The experiment suggests bigger benefit for explicitly signaled weights.
      
      Change-Id: I5438539ff4485c5752874cd1eb078ff14bf5235a
      23144d23
  3. 27 Feb, 2013 1 commit
    • John Koleszar's avatar
      Spatial resamping of ZEROMV predictors · eb939f45
      John Koleszar authored
      This patch allows coding frames using references of different
      resolution, in ZEROMV mode. For compound prediction, either
      reference may be scaled.
      
      To test, I use the resize_test and enable WRITE_RECON_BUFFER
      in vp9_onyxd_if.c. It's also useful to apply this patch to
      test/i420_video_source.h:
      
        --- a/test/i420_video_source.h
        +++ b/test/i420_video_source.h
        @@ -93,6 +93,7 @@ class I420VideoSource : public VideoSource {
      
           virtual void FillFrame() {
             // Read a frame from input_file.
        +    if (frame_ != 3)
             if (fread(img_->img_data, raw_sz_, 1, input_file_) == 0) {
               limit_ = frame_;
             }
      
      This forces the frame that the resolution changes on to be coded
      with no motion, only scaling, and improves the quality of the
      result.
      
      Change-Id: I1ee75d19a437ff801192f767fd02a36bcbd1d496
      eb939f45
  4. 05 Feb, 2013 1 commit
    • John Koleszar's avatar
      Add 8-tap generic convolver · 5ca6a366
      John Koleszar authored
      This commit introduces a new convolution function which will be used to
      replace the existing subpixel interpolation functions. It is much the
      same as the existing functions, but allows for changing the filter
      kernel on a per-pixel basis, and doesn't bake in knowledge of the
      filter to be applied or the size of the resulting block into the
      function name.
      
      Replacing the existing subpel filters will come in a later commit.
      
      Change-Id: Ic9a5615f2f456cb77f96741856fc650d6d78bb91
      5ca6a366