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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 image processing apparatus according to any one of (1) through (7), further including:

a prediction selector that selects a predicted image of either an intra-prediction or an inter-prediction;

in which the prediction selector selects the predicted image of the inter-prediction to calculate the predicted residual in case the transformation skip mode is selected in the inter-prediction.

(9)

The image processing apparatus according to (8), in which

the prediction selector selects the predicted image of either the intra-prediction or the inter-prediction on the basis of a costs of the inter-prediction and a cost of the intra-prediction in case the transformation skip mode is not selected in the inter-prediction.

(10)

The image processing apparatus according to (8) or (9), in which

the prediction selector selects the predicted image of the inter-prediction in case the transformation skip mode is selected for a transform unit of 4×4 pixels in the inter-prediction.

(11)

The image processing apparatus according to any one of (1) through (10), in which

the predicted residual represents the difference between a predicted image generated on the basis of an image as a target to be coded and the decoded image, and the image as the target to be coded.

INDUSTRIAL APPLICABILITY

權利要求

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