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求助前辈们 MeGUI里的Subpixel Refinement有个选项不明白
zlin790528@2011-04-09 01:36
如题 MeGUI里的Subpixel Refinement有个选项是10 QP-RD，不知道这个选项的解释，以前都用的09 RD
EdwardMass@2011-04-09 06:38
Add QPRD support as subme=10
Refactor trellis lambda selection to be done in analyse_init instead of in trellis.
This will allow for more easy adaption of lambda later on; for now it allows constant lambda across variable QPs.
QPRD is only available with adaptive quantization enabled and generally improves SSIM and visual quality.
Additionally, weight the SSD values from RD based on the relative QP offset for chroma; helps visually at high QPs where chroma has a lower QP than luma.
This fixes some visual artifacts created by QPRD at high QPs.
Note that this generally hurts PSNR and SSIM, and so is only on when psy-RD is on.
/* Rate-distortion optimal QP selection.
* FIXME: More than half of the benefit of this function seems to be
* in the way it improves the coding of chroma DC (by decimating or
* finding a better way to code a single DC coefficient.)
* There must be a more efficient way to get that portion of the benefit
* without doing full QP-RD, but RD-decimation doesn't seem to do the
* trick. */
roozhou@2011-04-10 02:58
subme 10出来都好久了吧
zlin790528@2011-04-10 19:44
感谢1楼的解释，回roozhou， subme10是出来好久了，我也用了有段时间了，可一直不知道比09 RD 哪儿好，索性就来问问吧
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