In a sense, psy-rd encapsulates all those r-d algorithms/tweaks/hacks that improve visual quality but may hurt objective metrics like psnr/ssim. In 444, this qp hack is likely to hurt objective metrics, hence it's turned on only if psychovisual improvement is desired. On Jun 25, 2014 7:02 PM, "Derek Buitenhuis" <derek.buitenh...@gmail.com> wrote:
> On 6/25/2014 12:10 PM, Deepthi Nandakumar wrote: > > This is primarily a visual quality improvement/psy-rd hack. In 444, > since chroma resolution is on par with luma, and our eyes arent very > sensitive to chroma, we increase the chroma QP so that those bits can be > used up in luma. > > Yah I get the idea of a chroma qp offset, I'm just wondering why it is > specific to psy-rd? > > Cheers, > - Derek > _______________________________________________ > x265-devel mailing list > x265-devel@videolan.org > https://mailman.videolan.org/listinfo/x265-devel >
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