ref: 0dccb6277c9350c157e866c243e9c93956635e6e
parent: cf3202132f74081292173e8cd6aff4bf9ca2c0af
author: Marco <marpan@google.com>
date: Mon Jan 5 12:13:13 EST 2015
Modify variance partition selection for low resolutions. For low spatial resolutions: bias partittion selection to smaller block sizes, and base the variance computation on 4x4 down-sampling. Also move the threshold computations into the choose_partitioning, so they are computed once for each sb block. On low-res clips (RTC_derf) PSNR/SSIMetrics increase by about 4-5%. No change for resolutions above CIF. Change-Id: I93f8ff742c8044786977bb6e31dcf8efda6dd1b0