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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

According to the present technology, a filter process is performed to apply an offset to pixels of a decoded image. Furthermore, the offset is inhibited from being applied to an edge portion depending on the occurrence of a transform unit in a transformation skip mode in which orthogonal transformation is not performed on a predicted residual. Therefore, an offset for correcting a DC component is applied to a transform unit where orthogonal transformation is skipped, making less conspicuous the boundary between a transform unit where orthogonal transformation is performed and the transform unit where orthogonal transformation is skipped. The image quality of the decoded image is thus restrained from being lowered. The advantages described in the present description are only illustrative, but not limitative, with additional advantages being not precluded.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram illustrating a configuration of an image coding apparatus.

FIG. 2 is a flowchart illustrating an operation sequence of the image coding apparatus.

FIG. 3 is a set of diagrams explaining an outline of an edge offset process.

FIG. 4 is a diagram explaining an outline of a band offset process.

FIG. 5 is a diagram illustrating a configuration of an adaptive offset filter.

FIG. 6 is a flowchart illustrating an adaptive offset filter setting operation sequence.

權利要求

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