tree 7921253aed2795d331b0fcc0300a639310ffc26a
parent 8ac928be918de0d502b7b492708d57ad4d817676
author yjshen <yjshen@google.com> 1585874506 -0700
committer Damon Shen <yjshen@google.com> 1586123943 +0000

Adjust a hyper-parameter used in temporal filter.

In the motion search of temporal filtering, the searched motion vector
will be passed along the frame sequence. A hyper-parameter (based on the
motion search error) is used to control whether to pass down the motion
vector from one frame to the next frame. Basically, if the search error
is too large (meaning the searched block is not accurate), we should not
pass down the motion vector any more.

This CL uses a larger threshold ONLY for hdres videos, i.e., increasing
the probability of passing down the motion vector.

Experimental results:

Under Speed-4 (two-pass mode):
          avg PSNR   ovr PSNR     SSIM
hdres       -0.104     -0.097   -0.101
hdres2      -0.103     -0.101   -0.133

STATS_CHANGED

Change-Id: I2e2f829187d5942dec67b967daa4b29ccea49125