ref: b6c75c5a8d019bde1b4d654b705f820015fc3ad5
parent: 91471d6aad285ff10e7582e485d8adadd1986fe2
author: Paul Wilkins <paulwilkins@google.com>
date: Thu Dec 11 11:22:03 EST 2014
Improve motion detection for low complexity regions. Where there is very subtle motion, especially when combined with low spatial complexity, the codec sometimes fails to quickly pick up the ambient motion field. Once it has been established though the field propagates well using Nearest and Near MV. This patch looks specifically at the case where the Nearest and Near have not been established as non zero vectors and in this case discounts the cost of searching for a new vector in the rd code. This will almost certainly have some implications in terms of encode speed but it should be possible to mitigate the impact in a subsequent using first pass stats and the local spatial complexity. Average results for test sets approximately neutral. Change-Id: I44a29e20f11f7ab10f8c93ffbdc50183d9801524