[x265] [PATCH 1 of 3] Chroma QP Offset: increase chroma QP when psy-rd is enabled

[Deepthi Nandakumar]

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.buitenhuis at 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
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