Opened 12 years ago

Closed 10 years ago

#275 closed defect (wontfix)

Issue on intra chroma scanIdx value

Reported by: tkunlin Owned by:
Priority: minor Milestone:
Component: HM Version: HM-5.0
Keywords: Cc: fbossen, ksuehring, davidf, jct-vc@…


According to section 8.5.2 of WD5d3, the scanIdx value for the intra chroma case should be : ScanType[ Log2( nS >> 2 ) ][ IntraPredModeC ].

The corresponding code in HM-5.0 is at line 4494 of TComDataCU.cpp:
uiScanIdx = aucIntraDirToScanIdx[max<Int>(uiCTXIdx-1,0)][uiDirMode];

The code does not match WD5d3, as the corresponding scanIdx value would be : ScanType[ 1 + Log2( nS >> 2 ) ][ IntraPredModeC ].

As a consequence, levels of an intra chroma 8x8 block are always diagonal scanned regardless of IntraPredModeC.

To match section 8.5.2 of WD5d3, line 4494 of TComDataCU.cpp should be:
uiScanIdx = aucIntraDirToScanIdx[uiCTXIdx][uiDirMode];

Change History (3)

comment:1 Changed 12 years ago by DefaultCC Plugin

  • Cc fbossen ksuehring davidf added

comment:2 Changed 12 years ago by davidf

  • Cc jct-vc@… added

comment:3 Changed 10 years ago by fbossen

  • Resolution set to wontfix
  • Status changed from new to closed

No mismatch between text and software in recent HM versions

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  • David Flynn(Subscriber, Participant)
  • Frank Bossen(Subscriber, Participant)
  • jct-vc@…(Subscriber)
  • karl.sharman@…(Always)
  • Karsten Suehring(Subscriber, Always)
  • Thomas Kunlin(Reporter)