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Old 11th August 2016, 13:35   #1  |  Link
asdf013cv
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what is luma location ( xCb, yCb ) exactly?

First, I give some values.
pic_width_in_luma_samples=1920
pic_height_in_luma_samples=1080
CtbSizeY=32
PicWidthInCtbsY=60
PicHeightInCtbsY=33

When I read inter prediction and intra prediction, the input description always say
"a luma location ( xCb, yCb ) specifying the top-left sample of the current luma coding block relative to the top-left luma sample of the current picture".

I know the range of x0 and y0 of coding_quadtree function in 7.3.8.4 are in 0 to pic_width_in_luma_samples and 0 to pic_height_in_luma_samples.
That means x0 and y0 is some kind of pixel position in frame.

But what is the range of xCb and yCb?
Are xCb and yCb in 0 to pic_width_in_luma_samples and 0 to pic_height_in_luma_samples, or
are xCb and yCb in 0 to PicWidthInCtbsY and 0 to PicHeightInCtbsY?
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Old 13th August 2016, 02:33   #2  |  Link
FancyMouse
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Sample location is pixel location, so it's the first interpretation.
And there can't even be ambiguity - coding block isn't ctb. Cb can have its own quadtree structure. So there is no way it can be expressed in your second interpretation.
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Old 13th August 2016, 03:45   #3  |  Link
asdf013cv
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Yeah, I found the second statement had some incorrect assumption.
Anyway, thank you for your help. <3
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Old 23rd August 2016, 21:48   #4  |  Link
benwaggoner
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Also, HEVC now comes with --chromaloc 2, required for HDR Blu-ray, which uses a different chroma location than everything else forever.


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Old 24th August 2016, 05:36   #5  |  Link
asdf013cv
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Quote:
Originally Posted by benwaggoner View Post
Also, HEVC now comes with --chromaloc 2, required for HDR Blu-ray, which uses a different chroma location than everything else forever.


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In ITU-T H.265 v3???
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