| commit | 81d16e3f530705a8bfc5712734af3b289bf72150 | [log] [tgz] |
|---|---|---|
| author | Yaowu Xu <yaowu@google.com> | Thu Jan 26 14:36:20 2012 -0800 |
| committer | Yaowu Xu <yaowu@google.com> | Thu Jan 26 14:50:11 2012 -0800 |
| tree | 4ac73ea23a9234087f83c6fc0e575662ef548bd9 | |
| parent | aebb16bfa81e57b6db35c2b709f863f1ae105f85 [diff] |
fixed an issue with 8x8 token cost in trellisquant changed the token cost for 8x8 transformed macroblock used in trellisquant from those derived from 4x4 transform coefficient distribution to those derived from 8x8 transform coefficient distribution. Test results show this fix help 8x8 transform based compression consistently on cif and hd sets: http://www.corp.google.com/~yaowu/no_crawl/t8x8/cif_cost8x8only.html (avg psnr:.14% glb psnr: .17% ssim: .20%) http://www.corp.google.com/~yaowu/no_crawl/t8x8/hd_cost8x8only.html (avg psnr:.17% glb psnr: .18% ssim: .58%) Note: To test the effect of this change, 8x8 transform was forced to be used only on 16x16 predicted macroblocks on inter frames, the effect would be bigger had all macroblocks been forcd to use 8x8 transform. Change-Id: If9b7868b75357c66541f511e5ee78e4d2d4929a4