Opened 11 years ago

Last modified 11 years ago

#1225 closed defect

4:2:2 and 4:4:4 chroma cbf coding — at Version 2

Reported by: kazui.kimihiko@… Owned by:
Priority: major Milestone: RExt D7
Component: RExt text Version: RExt D5 (O1005) v3
Keywords: Cc: davidf, joel, teruhiko, jct-vc@…

Description (last modified by davidf)

In both 4:2:2 and 4:4:4 the transform tree syntax doesn't provide for non non-zero TBs.

(Reminder), For 4:2:0, an 8x8 TU that is split to four 4x4 TUs will have a single 4x4 chroma TB coded. The chroma CBF for this single 4x4 TB is that from the level above (ie 8x8).

(1)
In the case of 4:2:2, which follows the 4:2:0 design, there are two 'leaf' 4x4 chroma TBs. The current spec has the issue that both chroma TBs inherit the CBF from the level above, requiring both to contain sig coefs.

(2)
In the case of 4:4:4, which allows the equal splitting of luma and chroma blocks (ie an 8x8CU can be split into four 4x4 luma TBs and four 4x4 Cb TBs), all 4x4 chroma TBs will inherit the CBF from the level above.

Change History (2)

comment:1 Changed 11 years ago by DefaultCC Plugin

  • Cc davidf joel teruhiko jct-vc@… added

comment:2 Changed 11 years ago by davidf

  • Description modified (diff)
  • Milestone changed from RExt D5 to RExt D6
  • Reporter changed from karlsharman to kazui.kimihiko@…
  • Summary changed from 4:2:2 chroma cbf coding to 4:2:2 and 4:4:4 chroma cbf coding
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  • David Flynn(Subscriber, Participant)
  • jct-vc@…(Subscriber)
  • Joel(Subscriber)
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  • Karsten Suehring(Always)
  • kazui.kimihiko@…(Reporter)
  • Teruhiko Suzuki(Subscriber)