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11th August 2016, 13:35 | #1 | Link |
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Join Date: Jul 2016
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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? |
13th August 2016, 02:33 | #2 | Link |
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Join Date: Sep 2014
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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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hevc. h.265 |
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