The Joint Collaborative Team on Video Coding (jct-vc) of itu-t wp3/16 and iso/iec jtc 1/ sc 29/ wg 11 held its tenth meeting during 11-20 July 2012 at the City Conference Centre (ccc), a k. a

5.15Transform coefficient coding

5.15.1Summary of actions taken

Actions taken:

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  JCTVC-J0142 proposal 1 coeff_abs_level_remaining coding
  
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  JCTVC-J0408v6 handling of transformed coefficient counter
  
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  JCTVC-J0150 removal of zigzag scan from scaling list coding
  
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  JCTVC-J0256 removal of the 8x2/2x8 coefficient groups, method 1
  
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  JCTVC-J0303 simplification on context derivation of cbf_luma syntax element
  

5.15.2Significance map coding

JCTVC-J0068 Refined significant map context derivation for large TU [T. Tsukuba, T. Yamamoto, T. Ikai (Sharp)]

In the last meeting, the position based context derivation technique (JCTVC-I0296) was adopted.This contribution presents a new context derivation table for significant_coeff_flag for large transform. The refined context derivation table reportedly provides average 0.1% coding gain on common condition.

No or little change in complexity, gain is around 0.03%No additional contexts.

Three zones (which requires one more comparison).

It is mentioned that by inclusion of I0296 in the last meeting, a slight loss of 0.1% was observed.

Not sufficient benefit to justify inclusion. No action.