发明名称 |
Arithmetic decoding device, arithmetic coding device, image decoding apparatus, and image coding apparatus |
摘要 |
A coefficient presence/absence flag decoding unit, included in a quantized residual information decoding unit which reduces a processing amount related to coding and decoding of a transform coefficient, splits a target frequency domain or a target pixel domain into sub-blocks, and derives different context indexes with respect to each transform coefficient in a pixel domain, obtained through a transform skip or a transform/quantization bypass, and each transform coefficient which is obtained for each frequency component through frequency transform. |
申请公布号 |
US9307264(B2) |
申请公布日期 |
2016.04.05 |
申请号 |
US201314408699 |
申请日期 |
2013.06.04 |
申请人 |
Sharp Kabushiki Kaisha |
发明人 |
Tsukuba Takeshi;Ikai Tomohiro;Yamamoto Tomoyuki |
分类号 |
G06K9/46;H04N19/62;H04N19/176;H04N19/70;H04N19/13;H04N19/134;H04N19/129;H04N19/102;H04N19/463;H04N19/44;H04N19/64;H04N19/196;H04N19/91;H04N19/157 |
主分类号 |
G06K9/46 |
代理机构 |
Keating & Bennett, LLP |
代理人 |
Keating & Bennett, LLP |
主权项 |
1. An arithmetic decoding device which decodes coded data of each transform coefficient which is obtained by performing frequency transform on a target image for each unit domain and each transform coefficient obtained through a transform skip or a transform/quantization bypass, the device comprising:
a context index deriving circuit that derives a context index of a non-zero transform coefficient presence/absence flag indicating whether or not the transform coefficient is 0 in a unit domain; and a syntax decoding circuit that arithmetically decodes the non-zero transform coefficient presence/absence flag by referring to the derived context index, wherein the context index deriving circuit derives a context index common to non-zero coefficient presence/absence flags corresponding to transform coefficients obtained through the transform skip or the transform/quantization bypass. |
地址 |
Osaka JP |