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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 ST22, the adaptive offset filter determines whether or not the edge offset is to be inhibited (EO to be inhibited). The adaptive offset filter 35 determines whether or not EO is to be inhibited on the basis of the transformation skip information from the transformation skip controller 44. FIG. 7 illustrates TUs in the transformation skip mode that are included in an LCU as a target to be processed. For example, it is indicated by the transformation skip information that there are 22 TUs included in the LCU as the target to be processed, 8 TUs in the transformation skip mode, 3 TUs of 8×8 pixels, and 4 TUs of 4×4 pixels.

The adaptive offset filter 35 performs a first determining operation in which it decides that EO is to be inhibited in case a TU in the transformation skip mode is included in the LCU as the target to be processed, and that EO is not to be inhibited in case no TU is included.

The adaptive offset filter 35 may perform a second determining operation different from the first determining operation. For example, the adaptive offset filter 35 determines whether or not EO is to be inhibited on the basis of the ratio of the number of Iris in the transformation skip mode included in the LCU as the target to be processed. In the case of FIG. 7, since there are 22 TUs included in the LCU as the target to be processed and 8 TUs in the transformation skip mode, the ratio of the number is 0.367 (=8/22). In case the ratio of the number is equal to or larger than a preset threshold value, the adaptive offset filter 35 decides that EO is to be inhibited. In case the ratio of the number is smaller than the threshold value, the adaptive offset filter 35 decides that EO is not to be inhibited.

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