Apparatus and Method of Sample Adaptive Offset for Luma and Chroma Components

Abstract

A method and apparatus for processing reconstructed video using in-loop filter in a video coding system are disclosed. The method uses chroma in-loop filter indication to indicate whether chroma components are processed by in-loop filter when the luma in-loop filter indication indicates that in-loop filter processing is applied to the luma component. An additional flag may be used to indicate whether the in-loop filter processing is applied to an entire picture using same in-loop filter information or each block of the picture using individual in-loop filter information. Various embodiments according to the present invention to increase efficiency are disclosed, wherein various aspects of in-loop filter information are taken into consideration for efficient coding such as the property of quadtree-based partition, boundary conditions of a block, in-loop filter information sharing between luma and chroma components, indexing to a set of in-loop filter information, and prediction of in-loop filter information.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present invention claims priority to U.S. Provisional Patent Application No. 61 / 486,504, filed May 16, 2011, entitled “Sample Adaptive Offset for Luma and Chroma Components”, U.S. Provisional Patent Application No. 61 / 498,949, filed Jun. 20, 2011, entitled “LCU-based Syntax for Sample Adaptive Offset”, and U.S. Provisional Patent Application No. 61 / 503,870, filed Jul. 1, 2011, entitled “LCU-based Syntax for Sample Adaptive Offset”. The present invention is also related to U.S. Non-Provisional patent application Ser. No. 13 / 158,427, entitled “Apparatus and Method of Sample Adaptive Offset for Video Coding”, filed on Jun. 12, 2011. The U.S. Provisional Patent Applications and U.S. Non-Provisional patent application are hereby incorporated by reference in their entireties.FIELD OF THE INVENTION[0002]The present invention relates to video processing. In particular, the present invention relates to apparatus and method for adaptive in-loop...

AI Technical Summary

Benefits of technology

[0005]A method and apparatus for processing reconstructed video using in-loop filter in a video decoder, wherein a picture area of the reconstructed video is partitioned into blocks and the in-loop filter is applied to the blocks, are disclosed. The method and apparatus comprise deriving reconstructed block from a video bitstream; receiving in-loop filter information from the video bitstream if a current reconstructed block is a new partition; deriving the in-loop filter information from a target block if the current reconstructed block is not said new partition, wherein the current reconstructed block is merged with the target block selected from one or more candidate blocks corresponding to one or more neighboring blocks of the current reconstructed block; and applying in-loop filter processing to the current reconstructed block using the in-loop filter information. In order to increase coding efficiency, a merge flag in the video bitstream may be used for the current block to indicate the in-loop filter information sharing with one of neighboring blocks if more than one neighboring block exists. If only one neighboring block exists, the in-loop filter information sharing is inferred without the need for the merge flag. According to the quadtree-partition property and merge information of said one or more candidate blocks, a candidate block may be eliminated from merging with the current reconstructed block so as to increase coding efficiency.

Problems solved by technology

Intensity shift may cause visual impairment or artifacts, which is especially more noticeable when the intensity shift varies from frame to frame.

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