A context model deciding method and its device for entropy coding of a conversion factor level, and entropy decryption

Japanese Patent JP5934376

B2

Provided are a method and apparatus for determining a context model for entropy encoding and decoding of a transformation coefficient. According to the method and apparatus, a context set index ctxset is obtained based on color component information of a transformation unit, a location of a current subset, and whether there is a significant transformation coefficient having a value greater than a first critical value in a previous subset, and a context offset c1 is obtained based on a length of a previous transformation coefficient having consecutive 1s. Also, a context index ctxids for entropy encoding and decoding of a first critical value flag is determined based on the obtained context set index and the context offset.

Pyo, In-ji
Min, John-He

JP2014539870A

June 15, 2016

October 31, 2012

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Samsung Electronics Company Limited

H04N19/149; H04N19/13; H04N19/176; H04N19/18; H04N19/70; H04N19/91

JP2009505494A

Joel Sole,Rajan Joshi,Marta Karczewicz,CE11:Unified scans for the significance map and coefficient level coding in high efficiency,Joint Collaborative Team on Video Coding(JCT-VC) of ITU-T SG16 WP3 and ISO/IEC JTC1/SC29/WG11 6th Meeting:Torino,IT,14-22 July,2011 ,米国,JCTVC,2011年 7月15日,JCTVC-F288,P.1-P.9,URL,http://phenix.it-sudparis.eu/jct/index.php
B. Bross, W. Han, J. Ohm, G. Sullivan and T. Wiegand,WD4: Working Draft 4 of High-Efficiency Video Coding,Joint Collaborative Team on Video Coding(JCT-VC) of ITU-T SG16 WP3 and ISO/IEC JTC1/SC29/WG11 6th Meeting:Torino,IT,14-22 July,2011,米国,JCTVC,2011年10月22日,JCTVC-F803,P.181-P.198,URL,http://phenix.it-sudparis.eu/jct/index.php

Tadashige Ito
Tadahiko Ito
Shinsuke Onuki

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