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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(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

FIG. 16 is a flowchart illustrating a second specific example of the operation for determining whether the transformation skip process is to be used or not.

In step ST61, the prediction selector generates a differential image. The prediction selector 43 generates a differential image representing the difference between the original image and the filtered original image using a median filter of 3×3 pixels, for example, and then goes to step ST62.

In step ST62, the prediction selector calculates a maximum luminance as an image feature quantity. The prediction selector 43 calculates a maximum luminance in an image of 4×4 pixels in the differential image generated in step ST61, and then goes to step ST63.

In step ST63, the prediction selector calculates a maximum color difference as an image feature quantity. The prediction selector 43 calculates a maximum color difference in the image of 4×4 pixels used in step ST62, and then goes to step ST64.

In step ST64, the prediction selector determines whether or not the maximum luminance is equal to or larger than a threshold value Thc. If the maximum luminance calculated in step ST62 is equal to or larger than the threshold value Thc, then the prediction selector 43 goes to step ST65. If the maximum luminance is not equal to or larger than the threshold value Thc, then the prediction selector 43 goes to step ST67.

權(quán)利要求

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