Video quality on face and skin areas seems more noisy in VP8 than SVC

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In some clips, e..g, kirkland_booth and mac_marco_stationary in
/google/data/rw/projects/webrtc/data/video/vp8_vs_svc/testFiles,
the quality seems somewhat better in skin/face areas in SVC than VP8.

This can been with encoding the VGA sequences at ~500kbps using
the webrtc settings for VP8.

The smoother quality on skin/faces from SVC seems to be overall more favorable 
from visual insepection.

It is not clear what parameter(s) can be changed/tuned to reduce the skin/face 
area noise.

Original issue reported on code.google.com by marpan@google.com on 25 Sep 2012 at 9:50

[GoogleCodeExporter]

Original comment by albe...@google.com on 11 Oct 2012 at 10:06

• Changed state: Assigned
• Added labels: Mstone-11, Pri-1, WebRTC

[GoogleCodeExporter]

We have analyzed this and found that the VP8 quality on skin areas improves if 
both the motion vector bias and denoiser are turned off locally in those areas. 
We have a CL for doing this but are still testing and investigating (e.g., the 
skin detection map and whether softening the bias/denoiser is sufficient) on 
other clips.

Original comment by marpan@google.com on 11 Oct 2012 at 10:15