commit 8b0a5b8718831f4d52af6333cc7b98c0618bfe5c
author Debargha Mukherjee <debargha@google.com> Tue Feb 09 12:24:33 2016 -0800
committer Debargha Mukherjee <debargha@google.com> Fri Feb 12 09:56:24 2016 -0800
tree 8eec83a5ff82c0eaf9ee81516cfbda14da31da1c
parent 13efa8a0894a3d49c3b2587ace6c1fe9425c4d3f

Adding loop wiener restoration

Adds a wiener filter based restoration scheme in loop which can
be optionally selected instead of the bilateral filter.

The LMMSE filter generated per frame is a separable symmetric 7
tap filter. Three parameters for each of horizontal and vertical
filters are transmitted in the bitstream. The fourth parameter
is obtained assuming the sum is normalized to 1.
Also integerizes the bilateral filters, along with other
refactoring necessary in order to support the new switchable
restoration type framework.

derflr: -0.75% BDRATE

[A lot of videos still prefer bilateral, however since many frames
now use the simpler separable filter, the decoding speed is
much better].

Further experiments to follow, related to replacing the bilateral.

Change-Id: I6b1879983d50aab7ec5647340b6aef6b22299636