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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(hào)
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

Next, a case in which the orthogonal transformation process is performed will be described below. A transform coefficient in case the orthogonal transformation process is performed on residuals in case an original image is an image of middle-range components is of values illustrated in (h) of FIG. 13. In FIG. 13, (i) illustrates quantized data of the transform coefficient. When the quantized data are dequantized and further inversely orthogonally transformed, decoded residual data illustrated in (j) of FIG. 13 are obtained. Furthermore, decoded image data illustrated in (k) of FIG. 13 are obtained by adding predicted image data to the decoded residual image data. The decoded image data produced using the orthogonal transformation process make the reproducibility of the gradation changes of the input image data illustrated in (a) of FIG. 13 high compared with (g) of FIG. 1.

As described above, in case an input image is an image of middle-range components, when the transformation skip process is performed by intra-prediction, the decoded image may become an image of lowered image quality compared with the case in which the orthogonal transformation process is performed. In the other operation of the image coding apparatus, therefore, the image quality of decoded images is restrained from being lowered by limiting selective operation of intra-prediction or inter-prediction on the basis of the determined result as to whether the transformation skip process is to be performed or not or whether there exists a TU in the transformation skip mode or not, etc.

權(quán)利要求

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