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Image processing apparatus and image processing method for inhibiting application of an offset to pixels of an image

專利號
US11039133B2
公開日期
2021-06-15
申請人
SONY CORPORATION（JP Tokyo）
發(fā)明人
Yusuke Miyagi; Yoshitaka Morigami
IPC分類
H04N19/117; H04N19/157; H04N19/176; H04N19/42
技術(shù)領(lǐng)域
image,skip,prediction,offset,in,adaptive,filter,data,section,sao
地域： Tokyo

摘要

A filter processing section 352 performs a filter process for applying an offset to pixels of a decoded image. A filter controller 351 inhibits the offset from being applied to an edge portion depending on occurrence of a transform unit in a transformation skip mode in which orthogonal transformation is not performed on a predicted residual. Furthermore, the filter controller 351 determines whether an offset for gradation adjustment using the decoded image is to be applied in the filter processing section 352 or not, and sets an offset in case the offset is to be applied. It is possible to make less conspicuous in the boundary between a transform unit where orthogonal transformation is performed by the offset for gradation adjustment and the transform unit where orthogonal transformation is skipped. The image quality of the decoded image is restrained from being lowered.

說明書

According to the present technology, EO is inhibited depending on a TU in the transformation skip mode in an LCU, and band offset is performed in the TU in the transformation skip mode, for example. In FIG. 11, (d) illustrates decoded image data produced when band offset performed as the SAO process. In FIG. 11, (d) illustrates a case in which the parameter “sao_band_position” indicating the position of the band is set to “5,” the parameter “sao_offset_abs” indicating the absolute value of the offset value is set to “26, 0, 0, 0,” and the parameter “sao_offset_sign” indicating the positive or negative of the offset value is set to “1, 1, 1, 1.” In this case, the DC of the TU in the transformation skip mode is corrected from “170” into “196,” making less conspicuous the boundary between the TU in the transformation skip mode and the adjacent TU. In FIG. 11, (e) schematically illustrates a decoded image produced when the band offset process is performed as the SAO process.

According to the present technology, therefore, since the edge offset process is inhibited depending on a TU in the transformation skip mode in an LCU, a coded stream for suppressing a reduction in the image quality can be generated by performing the SAO process even if a TU in the transformation skip mode is included in an LCU.

<1-6. Other Operation of Adaptive Offset Filter>

權(quán)利要求

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