Method and Apparatus for Effective Sample Adaptive Compensation

Abstract

For sample adaptive offset, classification may be used to classify the pixels into multiple categories and pixels in each category are offset compensated using an offset value for the category. The classification may be based on values of the current pixel and its neighboring pixels before SAO compensation. Therefore, the SAO compensated pixel cannot be written back to the current pixel location until the category for all pixels are determined. An embodiment of the present invention stores the relation between the current pixel and said one or more neighboring pixels so that the SAO compensated current pixel can replace the current pixel without buffering the to-be-processed pixels for classification. The SAO process may be performed on a region by region basis to adapt to the local characteristics of the picture. Rate-distortion optimization (RDO) is often used to guide the mode decision, such as region splitting / region merging decision. Computations associated with the RDO process usually are very computational intensive. Accordingly, distortion reduction estimation is developed which can substantially reduce the required computation associated with RDO.

Description

[0001] cross reference [0002] This application claims priority to U.S. Provisional Application No. 61 / 432,482, filed January 13, 2011, entitled "Picture Quadtree Adaptive Offset"; U.S. Provisional Application No. 61 / 436,296 for "Improved Offset Method"; U.S. Provisional Application No. 61 / 466,083, filed March 22, 2011, entitled "Sample Adaptive Offset"; and January 9, 2011 The U.S. application No.12 / 987,151 filed on 12 July 2011 with the title of "Apparatus and Method of Adaptive Offset for Video Coding" and the title of "APPARATUSAND METHOD OF EFFICIENT SAMPLE ADAPTIVE OFFSET" US Patent Application No. 13 / 177,424; submitted on June 12, 2011, the title of the invention is "Apparatus and Method of Sample Adaptive Offset for Video Coding" US Patent Application No. 13 / 158,427. This application incorporates by reference the aforementioned US provisional applications and patent applications. technical field [0003] The present invention relates to video processing, and in par...

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This multi-pass encoding algorithm may require a large number of external memory accesses resulting in high power consumption and long latency

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