tree 6350d9d5322df71345a140ff56ac00b96eb960f7
parent 1a3641d91b7179631113ece6c0f4bb25ad9b881f
author Deb Mukherjee <debargha@google.com> 1375488938 -0700
committer Gerrit Code Review <gerrit@gerrit.golo.chromium.org> 1376586105 -0700

Speed feature to skip split partition based on var

Adds a speed feature to disable split partition search based on a
given threshold on the source variance. A tighter threshold derived
from the threshold provided is used to also disable horizontal and
vertical partitions.

Results on derfraw300:
threshold = 16, psnr = -0.057%, speedup ~1% (football)
threshold = 32, psnr = -0.150%, speedup ~4-5% (football)
threshold = 64, psnr = -0.570%, speedup ~10-12% (football)

Results on stdhdraw250:
threshold = 32, psnr = -0.18%, speedup is somewhat more than derf
because of a larger number of smoother blocks at higher resolution.

Based on these results, a threshold of 32 is chosen for speed 1,
and a threshold of 64 is chosen for speeds 2 and above.

Change-Id: If08912fb6c67fd4242d12a0d094783a99f52f6c6