Deblocking filter method and adaptive loop filter method in video encoding and decoding

Abstract

The invention discloses a deblocking filter method. The deblocking filter method comprises, according to the relation between the prediction modes and / or the prediction directions of neighboring coding blocks and a boundary direction, determining the boundary strength of the two coding blocks, thereby determining the boundary strength more reasonably and improving the performance of deblocking filter. According to the deblocking filter method, masking effects of brightness and directive textures on block boundaries are also taken into consideration, when the masking effects reach a certain level, the boundary strength is directly set to be zero, so that computation of the boundary strength can be simplified. The invention also discloses an adaptive loop filter method. According to the adaptive loop filter method, by means of the relevance pixel values before and after the deblocking filter, the loop filter performance can be improved.

Description

Technical field [0001] The present invention relates to video image coding and decoding technology, and more specifically, a deblocking filtering method and an adaptive loop filtering method in video coding and decoding. Background technique [0002] Audio Video Coding Standard V2.0 (AVS2.0) is the abbreviation of "Advanced Audio and Video Coding in Information Technology" series of standards. It is the second-generation source coding standard with independent intellectual property rights in my country, and it is also digital audio and video. The common basic standards of the industry. figure 1 Block diagram for efficient video coding. Among them, AVS2.0 mainly uses a deblocking filter (DF). In addition, following H.264 / AVS, a new generation of video coding standard HEVC was introduced. In addition to the deblocking filter, the test model HM of HEVC also includes an adaptive loop filter (ALF). [0003] The deblocking filter reduces the blocking effects caused by block prediction a...

AI Technical Summary

Problems solved by technology

Second, motion estimation and motion compensation are also a cause of blockiness

[0006] The traditional deblocking filter uses a strong filter for the boundary of intra-coded blocks, without considering information such as the mode of intra-frame coding, and the calculation process of the boundary strength is inaccurate

The traditional deblocking filter does not consider the masking effect of the human visual system for the masking of the block boundary, so it cannot achieve a better subjective effect

[0007] In addition, the correlation between the pixel value after the deblocking filter and the unfiltered reconstructed pixel value is not used in the existing adaptive loop filter to improve the subjective and objective quality of the image. Therefore, the adaptive There is still room for improvement in the performance of the loop filter

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