Opened 9 years ago

Closed 9 years ago

#736 closed defect (fixed)

"quantization group" not defined in 8.6.1

Reported by: chadfogg Owned by: bbross
Priority: minor Milestone:
Component: Text Version: D8 (J1003) d7
Keywords: Cc: bbross, wjhan, jct-vc@…

Description

Likely meant to be tied to the coded_sub_block_flag construction in 7.4.12 and lastSubBlock in 7.3.13.
(discovered by Purvin.Pandit@…)

Change History (3)

comment:1 Changed 9 years ago by DefaultCC Plugin

  • Cc bbross wjhan jct-vc@… added

comment:2 Changed 9 years ago by bbross

Could you elaborate a bit more on how a quantization group is tied to coded_sub_block_flag semantics and the variable lastSubBlock in residual_coding syntax?

My quick first suggestion of a definition of a quantization group would be:
"The luma location ( xQG, yQG ), specifies the top-left luma sample of the current quantization group relative to the top left luma sample of the current picture. The horizontal and vertical positions xQG and yQG are set equal to ( xC − ( xC & ((1 << Log2MinCuQPDeltaSize) − 1) ) ) and ( yC − ( yC & ((1 << Log2MinCuQPDeltaSize) − 1) ) ), respectively. The luma size of a quantization group, Log2MinCuQPDeltaSize, determines the area inside a coding tree block that shares the same QP."
But I am open for improved definitions.

comment:3 Changed 9 years ago by bbross

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

Suggested improvement:
"The luma size of a quantization group, Log2MinCuQPDeltaSize, determines the luma size of the smallest area inside a coding tree block that shares the same qPY_PRED."

This will be fixed in JCTVC-K0030_v5.

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