Opened 9 years ago

Closed 9 years ago

#733 closed defect (fixed)

8.5.2.1.7 : Behavior when collocated PB cross right picture boundary.

Reported by: AlexisLefebvre Owned by: bbross
Priority: minor Milestone: D8
Component: Text Version: D9 (K1003) v10
Keywords: Cc: bbross, wjhan, jct-vc@…

Description

Hi,
In chapter 8.5.2.1.7, the collocated coordinates are derived according to the vertical position "( yP >> Log2CtbSizeY ) is equal to ( yPRb >> Log2CtbSizeY )" to know whether to select central luma location or bottom-right luma location.

This force to work always with the same Ctb row in the collocated picture and in the current picture.

But it is not explained what to do when the collocated Pb cross the right picture boundary. For example the top-right Pb of the current Ctb can have its collocated Pb outside the picture boundary if the current Ctb is the last Ctb of a picture row and it respect the "( yP >> Log2CtbSizeY ) is equal to ( yPRb >> Log2CtbSizeY )" equation.

In this case I see 2 solutions :
1) Central luma location is used instead.
2) The collocated Pb is marked as unavailable.

Regards,
Alexis

(Pb: prediction block, Ctb: coding tree block )


Change History (5)

comment:1 Changed 9 years ago by DefaultCC Plugin

  • Cc bbross wjhan jct-vc@… added

comment:2 Changed 9 years ago by bbross

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

comment:3 Changed 9 years ago by bbross

  • Resolution fixed deleted
  • Status changed from closed to new

comment:4 Changed 9 years ago by bbross

  • Version changed from D8 (J1003) d7 to D9 (K1003) v10

comment:5 Changed 9 years ago by bbross

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

This has been fixed in JCTVC-K1003_v11.

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