发明名称 |
METHOD AND APPARATUS FOR DETERMINING A CONTEXT MODEL FOR TRANSFORM COEFFICIENT LEVEL ENTROPY ENCODING AND DECODING |
摘要 |
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. |
申请公布号 |
US2015215646(A1) |
申请公布日期 |
2015.07.30 |
申请号 |
US201514678637 |
申请日期 |
2015.04.03 |
申请人 |
SAMSUNG ELECTRONICS CO., LTD. |
发明人 |
PIAO Yin-ji;MIN Jung-hye |
分类号 |
H04N19/60;H04N19/91;H04N19/18;H04N19/186;H04N19/176 |
主分类号 |
H04N19/60 |
代理机构 |
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代理人 |
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主权项 |
1. An apparatus for determining a context model for entropy decoding, the apparatus comprising:
a contest set obtaining unit that determines a current transform unit based on size information of a transform unit, wherein the size information is obtained from a bitstream, and, when the current transform unit is a transform unit of a luminance component, determining a context set of a current sub-block in the current transform unit based on first threshold value information of a previous sub-block, and when the current transform unit is a transform unit of a chroma component, determining the context set of the current sub-block in the current transform unit based on the first threshold value information of the previous sub-block independently of a position of the current sub-block; and a context determining unit that determines a context model for obtaining current first threshold value information based on the context set of the current sub-block, wherein the current first threshold value information indicates whether a current transformation coefficient in the current sub-block is greater than a first threshold value. |
地址 |
Suwon-si KR |