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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
技術領域
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

The inverse orthogonal transformation section 64 switches the operation of an inverse orthogonal transformation on the basis of the parameters supplied from the entropy decoding section 62. In case the data supplied from the dequantization section 63 are data of a TU not in the transformation skip mode, the inverse orthogonal transformation section 64 performs an inverse orthogonal transformation according to a process corresponding to the orthogonal transformation process of the orthogonal transformation section 23 illustrated in FIG. 1, and obtains and outputs decoded residual data corresponding to the residual data prior to the orthogonal transformation in the image coding apparatus 10 to the operator 65. In case the data supplied from the dequantization section 63 are data of a TU in the change skip mode, the inverse orthogonal transformation section 64 outputs the data to the operator 65 without performing an inverse orthogonal transformation thereon. In case the bit shift process is performed on residual data of a TU in the change skip mode, the inverse orthogonal transformation section 64 performs a bit shift process in the opposite direction.

The operator 65 is supplied with predicted image data from the intra-predicting section 73 or the motion compensating section 74. The operator 65 adds the decoded residual data and the predicted image data to each other, obtaining decoded image data corresponding to the original image data before the predicted image data are subtracted therefrom by the operator 22 of the image coding apparatus 10. The operator 65 outputs the decoded image data to the deblocking filter 66.

權利要求

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