Incorrect conditions for checking different CTUs between the positions (xQg-1, yQg) and (xCb, yCb) in section 8.7.1

[moonmo.koo]

In the section 8.7.1 (Derivation process for quantization parameters) in the current VVC spec text, the following conditions can be found, which check whether or not two positions, (xQg-1, yQg) and (xCb, yCb), lie in different CTUs:

......

The CTB containing the luma coding block covering the luma location ( xQg − 1, yQg ) is not equal to the CTB containing the current luma coding block at ( xCb, yCb ), i.e. '''all of the following conditions are true''':
– ( xQg − 1 )  >>  CtbLog2SizeY is not equal to ( xCb )  >>  CtbLog2SizeY
– ( yQg )  >>  CtbLog2SizeY is not equal to ( yCb )  >>  CtbLog2SizeY

......

The CTB containing the luma coding block covering the luma location ( xQg, yQg − 1 ) is not equal to the CTB containing the current luma coding block at ( xCb, yCb ), i.e. '''all of the following conditions are true''':
– ( xQg )  >>  CtbLog2SizeY is not equal to ( xCb )  >>  CtbLog2SizeY
– ( yQg − 1 )  >>  CtbLog2SizeY is not equal to ( yCb )  >>  CtbLog2SizeY

......

It seems that "all of the following conditions" should be replaced by "any of the following conditions" for correct checking.

[delagrangep]

Good catch. Agreed.

[bbross]

Thanks for reporting!

This is fixed in JVET-Q2001-v3.