commit e88a28057311c24d61f1b122cdf7aa4d2685434e
author Jingning Han <jingning@google.com> Tue Apr 15 11:41:39 2014 -0700
committer Jingning Han <jingning@google.com> Wed Apr 16 14:00:52 2014 -0700
tree d17da590a736490e11a22cc243b935b64812349d
parent 23ccf7192434399e5db3a981fbfde40e1712ed5f

Enable more precise background detection for partition decision

This commit compares the current original frame to the previous
original frame at 64x64 block level and decides if the entire
block belongs to background area. If it is in the background area,
skip non-RD partition search and copy the partition types of the
collocated block in the previous frame.

For vidyo1 in the rtc set, this makes the speed -5 coding speed
about 8% faster. The overall compression performance is down by
1.37% for rtc set.

Change-Id: Iccf920562fcc88f21d377fb6a44c547c8689b7ea