Opened 9 years ago

Closed 9 years ago

#559 closed defect (worksforme)

log2_min_coding_block_size_minus3 and log2_diff_max_min_coding_block_size range and semantic

Reported by: pandrivon Owned by: bbross
Priority: minor Milestone:
Component: Text Version: D7 (I1003) d2
Keywords: Cc: bbross, wjhan, jct-vc@…

Description

Correct me if I am wrong, but I could not find any previous ticket or reflector discussion about range of LCU(CTB) and SCU.
The current D7 (d2) do not constraint log2_min_coding_block_size_minus3 neither log2_diff_max_min_coding_block_size. I could not find such constraints in Profile section too (Annex A - A.3.2). However, I guess that Main Profile is currently defined for Max CTB = 64x64?

Another minor note about semantics typo:
"Log2CtbSize = log2_min_coding_block_size_minus 3 +3..."
should be
"Log2CtbSize = log2_min_coding_block_size_minus3 +3..."
(remove space)

Same remark for:
"The variable Log2MaxTrafoSize is set equal to log2_min_transform_block_size_minus 2 + 2" should be
"The variable Log2MaxTrafoSize is set equal to log2_min_transform_block_size_minus2 + 2"
(remove space)

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 yk

The profile definition has:

– Log2CtbSize shall be in the range from 4 to 6, inclusive.

That restricts the CTB/LCU size range.

This topic has been discussed earlier, most likely at JCT-VC#8 (if I am not wrong), and the decision was to leave the value ranges as profile&level dependent.

comment:3 Changed 9 years ago by bbross

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