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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(qǐng)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

In step ST103, the image decoding apparatus performs a predicted image generating process. The intra-predicting section 73 or the motion compensating section 74 of the image decoding apparatus 50 performs the predicted image generating process depending on the prediction mode information supplied from the entropy decoding section 62.

Specifically, in case the intra-prediction mode information is supplied from the entropy decoding section 62, the intra-predicting section 73 generates an intra-predicted image in the intra-prediction mode. In case the inter-prediction mode information is supplied from the entropy decoding section 62, the motion compensating section 74 performs a motion compensation process in the inter-prediction mode and generates an inter-predicted image. According to this processing, the predicted image (the intra-predicted image) generated by the intra-predicting section 73, or the predicted image (the inter-predicted image) generated by the motion compensating section 74 output to the operator 65.

In step ST104, the image decoding apparatus performs a dequantizing process. The dequantizing section 63 of the image decoding apparatus 50 dequantizes quantized data obtained by the entropy decoding section 62 according to a process corresponding to the quantizing process of the quantization section 24 illustrated in FIG. 1, and outputs the dequantized data to the inverse orthogonal transformation section 64.

權(quán)利要求

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