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DescriptionThis article is from the, byFrank Gadegast [email protected] with numerous contributionsby others.88 How are the subsampled chroma samples cited? (MPEG-2)It is moderately important to properly co-site chroma samples,otherwise a sort of chroma shifting effect (exhibited as a halo) mayresult when the reconstructed video is displayed. In MPEG-1 video, thechroma samples are exactly centered between the 4 luminance samples(Fig 1.) To maintain compatibility with the CCIR 601 horizontalchroma locations and simplify implementation (eliminate need for phaseshift), MPEG-2 chroma samples are arranged as per Fig.2.Y Y Y Y Y Y Y Y YC Y YC YC C C CY Y X Y Y Y Y Y YC Y YC YY Y Y Y Y Y Y Y YC Y YC YC C C CY Y Y Y Y Y Y Y YC Y YC YFig.1 MPEG-1 Fig.2 MPEG-2 Fig.3 MPEG-2 and4:2:0 organization 4:2:0 organization CCIR Rec. 6014:2:2 organizationContinue to:. prev:. next.
Nov 14, 2008 The ChromaShift Avisynth filter was dsigned to shift the chrominance information (C U and V together) or the U or the V separately, by an even number of pixels, in either horizontal direction.