commit f3477635d3d44a2448b5298255ee054fa71d7ad9
author emilkeyder@google.com <emilkeyder@google.com> Wed Mar 01 16:29:14 2017 -0500
committer Emil Keyder <emilkeyder@google.com> Sat Mar 25 23:25:13 2017 +0000
tree af06de5071e6c6fd405fe497bb8e25934a4c6f58
parent 5bd2d2f9dfcbe435412ff9a01d3554cac7a38f25

Compute multiple global motions and pick best by error adv.

Modify ransac to keep the N best global motions by num_inliers and
variance rather than a single one. Compute the error advantage for
each in encode_frame_internal(), and use the best as the global motion
for that pair of <target, reference> frames.

Improvements for different values of N:

N                     %PSNR gain on lowres
1 (current impl)      1.287
2                     1.328
4                     1.370
8                     1.419
16                    1.427
32                    1.439

Change-Id: Ic0c9066a3f175a5ea0a78828cd244104e70144ba