• 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