Title:
A method and a device of delta quantization parameter processing of efficient image coding
Document Type and Number:
Japanese Patent JP6110978
Kind Code:
B2
Abstract:
In the current high efficiency video coding development, each LCU has its own quantization parameter (QP) and the difference between a current QP and a reference QP is transmitted instead of the QP value itself. Since the LCU is much larger than the macroblock of AVC/H.264, using one delta QP per LCU may cause rate control unable to adapt to the bitrate quickly enough. Consequently there is a need to adopt delta QP in units smaller than LCU to provide more granular rate control. Furthermore, it is desirable to develop a system that is capable of facilitating more flexible delta QP. Accordingly, adaptive quantization parameter processing is disclosed where a QP minimum CU size for incorporating or deriving a delta QP is indicated selectively in the slice level or in the sequence/picture level. In one variation, the delta QP is incorporated or derived only if nonzero quantized transform coefficients exist in a leaf CU that is larger than the QP minimum CU size. In another variation, quantization parameter information is only incorporated or derived when a leaf CU has any nonzero quantized transform coefficient. In yet another variation, a flag is used to indicate whether one delta QP per LCU is transmitted if the LCU has any nonzero quantized transform coefficient or one delta QP per leaf CU is transmitted if the leaf CU has any nonzero quantized transform coefficient.
Inventors:
Fan, yuuen
Chen, Chingye
Fu, Jimin
Shu, Deway
Zhang, Yulin
Duane, Zudea
Ray, Xiao Ming
Chen, Chingye
Fu, Jimin
Shu, Deway
Zhang, Yulin
Duane, Zudea
Ray, Xiao Ming
Application Number:
JP2016080859A
Publication Date:
April 05, 2017
Filing Date:
April 14, 2016
Export Citation:
Assignee:
HFI Innovation Inc.
International Classes:
H04N19/70; H04N19/126; H04N19/159; H04N19/176
Foreign References:
| WO2012042890A1 | ||||
| WO2012023806A2 | ||||
| WO2011140211A2 |
Other References:
Yu-Wen Huang et al.,A Technical Description of MediaTek's Proposal to the JCT-VC CfP,Joint Collaborative Team on Video Coding (JCT-VC)of ITU-T SG16 WP3 and ISO/IEC JTC1/SC29/WG11,1st Meeting: Dresden, DE,2010年 4月,JCTVC-A109,pp.1-28
Kazushi Sato,Proposal on Large Block Structure and Quantization,Joint Collaborative Team on Video Coding (JCT-VC) of ITU-T SG16 WP3 and ISO/IEC JTC1/SC29/WG11,3rd Meeting: Guangzhou, CN,2010年10月,JCTVC-C167,pp.1-8
Madhukar Budagavi and Minhua Zhou,Delta QP signaling at sub-LCU level,Joint Collaborative Team on Video Coding (JCT-VC) of ITU-T SG16 WP3 and ISO/IEC JTC1/SC29/WG11,4th Meeting: Daegu, KR,2011年 1月,JCTVC-D038_r1,pp.1-5
Tzu-Der Chuang et al.,AhG Quantization: Sub-LCU Delta QP,Joint Collaborative Team on Video Coding (JCT-VC) of ITU-T SG16 WP3 and ISO/IEC JTC1/SC29/WG11,5th Meeting: Geneva,2011年 3月,JCTVC-E051_r2,pp.1-6
Kazushi Sato,Proposal on Large Block Structure and Quantization,Joint Collaborative Team on Video Coding (JCT-VC) of ITU-T SG16 WP3 and ISO/IEC JTC1/SC29/WG11,3rd Meeting: Guangzhou, CN,2010年10月,JCTVC-C167,pp.1-8
Madhukar Budagavi and Minhua Zhou,Delta QP signaling at sub-LCU level,Joint Collaborative Team on Video Coding (JCT-VC) of ITU-T SG16 WP3 and ISO/IEC JTC1/SC29/WG11,4th Meeting: Daegu, KR,2011年 1月,JCTVC-D038_r1,pp.1-5
Tzu-Der Chuang et al.,AhG Quantization: Sub-LCU Delta QP,Joint Collaborative Team on Video Coding (JCT-VC) of ITU-T SG16 WP3 and ISO/IEC JTC1/SC29/WG11,5th Meeting: Geneva,2011年 3月,JCTVC-E051_r2,pp.1-6
Attorney, Agent or Firm:
Eternal patent business corporation
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