Opened 12 years ago

Closed 12 years ago

#384 closed defect (fixed)

Context increment for coeff_abs_level_greater1_flag and coeff_abs_level_greater2_flag

Reported by: cjlsnow Owned by: bbross
Priority: minor Milestone: D7
Component: Text Version: D6 (H1003) dI/dJ/dK
Keywords: context index derivation Cc: bbross, wjhan, jct-vc@…

Description

Actually in dK version.

Context increment for coeff_abs_level_greater1_flag and coeff_abs_level_greater2_flag is not accurately derived in specification according to the adoption of high throughput proposal.

The bug can be fixed by doing,
1) Add variant numGreater1 in 7.3.10 residual_coding () syntax table and update it.
2) Remove derivation and update process of variant numGreater1 in 9.2.3.1.5 and 9.2.3.1.6

Attached is text modification in related sections.

Attachments (2)

ctxIdxInc_derivation_in_level_coding.docx​ (29.4 KB) - added by cjlsnow 12 years ago.
specification modification
fix384.docx​ (28.7 KB) - added by bbross 12 years ago.

Download all attachments as: .zip

Change History (6)

comment:1 Changed 12 years ago by DefaultCC Plugin

  • Cc jct-vc@… added

Changed 12 years ago by cjlsnow

specification modification

Changed 12 years ago by bbross

comment:2 Changed 12 years ago by bbross

A more detailed description of the issues in the two context derivation processes:
1)
The context increment derivation for coeff_abs_level_greater1_flag uses the value of the variable numGreater1 "that has been derived during the last invocation of subclause 9.2.3.1.6 for the syntax element coeff_abs_level_greater2_flag for the subset i + 1". In 9.2.3.1.6, the variable numGreater1 is currently not derived anymore but just set to 0.
2)
In the context derivation for coeff_abs_level_greater2_flag, ctxIdxInc is not defined properly. Equation 9-38 should not be conditioned on "– If n is equal to 15 or all previous syntex elements coeff_abs_level_greater2_flag[ pos ] with pos greater than n are derived to be equal to 0 instead of being explicitly parsed"1

A fix that only changes the derivation processes can be found in attached fix384.docx.

comment:3 Changed 12 years ago by bbross

  • Milestone changed from WD6 to D7

comment:4 Changed 12 years ago by bbross

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

Fixed in JCTVC-I1003_d9.

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  • Benjamin Bross(Owner, Subscriber, Participant)
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  • Karsten Suehring(Always)
  • Woo-Jin Han(Subscriber)