Opened 12 years ago

Closed 11 years ago

# Clarify about formula of RefPicOrderCnt and LongTermRefPic

Reported by: Owned by: vikingwang@… bbross minor D9 Text D9 (K1003) v10 LongTermRefPic, RefPicOrderCnt bbross, wjhan, jct-vc@…

### Description

In subclause 8.5.3.1.7 of JCTVC-K0030_V3 (page 125), there's confusion about the formula for RefPicOrderCnt. We can update it as follows to make it more clear.

The original version:

The function RefPicOrderCnt( picX, refIdx, LX ) returns the picture order count PicOrderCntVal of the reference picture with index refIdx from reference picture list LX of the picture picX and is specified as follows.

RefPicOrderCnt( picX, refIdx, LX ) = PicOrderCnt(RefPicListX[refIdx] of the picture picX) (8 141)

The possible updated version:

The function RefPicOrderCnt( picX, pbX, refIdx, LX ) returns the picture order count PicOrderCntVal of the reference picture with index refIdx from reference picture list LX of the slice containing prediction block pbX in the picture picX and is specified as follows.
RefPicOrderCnt( picX, pbX, refIdx, LX ) = PicOrderCnt(RefPicListX[refIdx] of the prediction block pbX in the picture picX) (8-151)

The similar update for subclause8.5.3.1 (page 114)

The original version:

The function LongTermRefPic( picX, refIdx, LX ), with X being either 0 or 1, is defined as follows. If the picture with index refIdx from reference picture list LX of the picture picX was marked as "used for long term reference" at the time when picX was the current picture, LongTermRefPic( picX, refIdx, LX ) is equal to 1; otherwise LongTermRefPic( picX, refIdx, LX ) is equal to 0.

The possible updated version:

The function LongTermRefPic( picX, pbX, refIdx, LX ), with X being either 0 or 1, is defined as follows. If the picture with index refIdx from reference picture list LX of the slice containing prediction block pbX in the picture picX was marked as "used for long term reference" at the time when picX was the current picture, LongTermRefPic( picX, pbX, refIdx, LX ) is equal to 1; otherwise LongTermRefPic( picX, pbX, refIdx, LX ) is equal to 0.

Thanks a lot to Benjamin's kinldy help on the clarification for such confusion points.

Best regards.
Viking

### comment:1 Changed 12 years ago by DefaultCC Plugin

• Cc bbross wjhan jct-vc@… added

### comment:2 Changed 11 years ago by bbross

• Milestone changed from D8 to D9
• Version changed from D8 (K0030) v3 to D9 (K1003) v10

### comment:3 Changed 11 years ago by bbross

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

### comment:4 Changed 11 years ago by bbross

• Resolution fixed deleted
• Status changed from closed to new

### comment:5 Changed 11 years ago by bbross

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

This has been fixed in JCTVC-K1003_v11.

Note: See TracTickets for help on using tickets.

This list contains all users that will be notified about changes made to this ticket.

These roles will be notified: Reporter, Owner, Subscriber, Participant

• Benjamin Bross(Owner, Subscriber, Participant)
• jct-vc@…(Subscriber)
• karl.sharman@…(Always)
• Karsten Suehring(Always)
• vikingwang@…(Reporter)
• Woo-Jin Han(Subscriber)