ref: 2ffe64ad5ceb7443fefceab0adf6722428825efe
parent: bb64c9a355f87ce9ab7892413c6fa7c340dd6e3c
author: Deb Mukherjee <debargha@google.com>
date: Fri Aug 16 09:51:00 EDT 2013
Cleanup/enhancements of switchable filter search Cleans up the switchable filter search logic. Also adds a speed feature - a variance threshold - to disable filter search if source variance is lower than this value. Results: derfraw300 threshold = 16, psnr -0.238%, 4-5% speedup (tested on football) threshold = 32, psnr -0.381%, 8-9% speedup (tested on football) threshold = 64, psnr -0.611%, 12-13% speedup (tested on football) threshold = 96, psnr -0.804%, 16-17% speedup (tested on football) Based on these results, the threshold is chosen as 16 for speed 1, 32 for speed 2, 64 for speed 3 and 96 for speed 4. Change-Id: Ib630d39192773b1983d3d349b97973768e170c04