tree 6e8b4ce04c4c18aa8216841b26149ced5969683c
parent 50cbe975eaea1edbee693330d0f3c2f33ede2c73
author chiyotsai <chiyotsai@google.com> 1596571955 -0700
committer Chi Yo Tsai <chiyotsai@google.com> 1597186703 +0000

Downsample sad computation in hd motion search

This CL adds a speed feature to downsample the SAD computation during
motion search by skipping every other row in sad computation.

The downsampling is only performed when there are sufficiently many rows
to get a good estimation. Empirically, this happens when there are at
leas 16 rows.

Currently this speed feature is only enabled on hdres set.

Performance:
 SPD_SET | OVR_PSNR | AVG_PSNR |   SSIM  |  SPD
    0    |  +0.021% |  +0.025% | +0.084% | +2.3%
    1    |  +0.053% |  +0.071% | +0.136% | +3.8%
    2    |  +0.037% |  +0.055% | +0.091% | +4.3%
    3    |  +0.025% |  +0.038% | +0.074% | +2.6%
    4    |  +0.029% |  +0.043% | +0.093% | +3.0%
    5    |  +0.117% |  +0.128% | +0.194% | +3.3%
    6    |  +0.065% |  +0.082% | +0.179% | +3.2%

BUG=aomedia:2781

STATS_CHANGED

Change-Id: Ibf2afd9a7ffed939897249527b41bbaa4152a62c