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Adaptive loop filter method in video coding and decoding

An adaptive loop, video encoding and decoding technology, applied in the field of video encoding and decoding, can solve problems such as unsatisfactory effects

Active Publication Date: 2016-07-20
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Whether it is DF or SAO, they use the local correlation of the image to reduce the compression noise by filtering the neighboring pixels or directly compensating the pixels, and the effect is not ideal.

Method used

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  • Adaptive loop filter method in video coding and decoding
  • Adaptive loop filter method in video coding and decoding
  • Adaptive loop filter method in video coding and decoding

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Embodiment 1

[0062] A schematic diagram of the implementation principle of a loop filtering method in video encoding and decoding using non-local similarity of video images proposed by the embodiment of the present invention is as follows figure 1 As shown, the specific processing flow is as follows figure 2 shown, including the following steps:

[0063] Step S210, divide each color channel of the input reconstructed video into N×N image blocks, select the most similar K image blocks for each image block, and form a non-locally similar block matrix Y i ;

[0064] The filter proposed by the present invention can be located in any position between the dequantized reconstructed video and the compressed video output buffer in the video coding loop, such as image 3 The HEVC encoding framework shown is taken as an example, where positions A, B, and C are all suitable for integrating the filter module proposed by the present invention. In the embodiment of the present invention, the video in...

Embodiment 2

[0102] A loop filtering method in video coding and decoding, which includes the same steps as in embodiment 2; the difference is that inter-frame and intra-frame coding methods are used to compress some common video sequences under all QPs respectively, and statistics from these compressed videos The standard deviation σ of the compression noise for each image block group n，i and the standard deviation σ of the pixels in each image patch group y，i , and then for each QP value, each color channel of the intra-frame and inter-frame coded images is fitted separately, and the standard deviation of pixels and the standard deviation of compression noise in similar image blocks in the image block group are established.

Embodiment 3

[0104] A loop filtering method in video coding and decoding, the steps that it comprises are identical with embodiment two; The difference is that the power function shown in formula (2) is adopted to σ y，i and σ n，i Fitting is performed on different color channels, different coding methods (inter-frame coding and intra-frame coding) and different QPs. The fitting results under common QP are shown in Table 1:

[0105] Table 1 Luma channel fitting parameters (a, b) under common quantization parameters

[0106]

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Abstract

The embodiment of the invention provides an adaptive loop filter method in video coding and decoding. The method comprises: image block division is carried out on an inputted reconstruction video image, a similar block matrix is formed based on the image blocks, and singular value decomposition is carried out on the similar block matrix to obtain a singular value of the similar block matrix; a standard difference of the reconstruction video image is calculated, a shrinkage filter threshold value of the similar block matrix is determined according to the standard different, a coding mode, and a quantization parameter of the reconstruction video image, and shrinkage filtering is carried out on the singular value of the similar block matrix based on the shrinkage filter threshold value; and the image blocks in the similar block matrix are reconstructed by using the shrunk singular value to obtain an adaptive loop filter video image. According to the embodiment of the invention, an adaptive filter control parameter estimation method is put forward by using non-local similarity inside a video image and high-efficiency adaptive loop filtering in video coding and decoding is realized, so that the video compression performance is improved effectively.

Description

technical field [0001] The invention relates to the technical field of video coding and decoding, in particular to a method for adaptive loop filtering in video coding and decoding. Background technique [0002] The hybrid video coding framework based on block prediction and transform has been widely used in mainstream video coding systems, such as MPEG-1 / 2 / 4, H.261 / H.263 / H.264 and HEVC coding systems. The above coding system takes block as the basic unit, reduces video redundancy and improves compression efficiency through intra-frame and inter-frame prediction, orthogonal transformation, entropy coding and post-processing. In the compression process, due to the existence of lossy operation-quantization (quantization), there will be compression noise in the decoded reconstructed video, especially in the case of low bit rate, the compression noise represented by blocking effect and ringing effect will be Significantly affects video quality. At the same time, the inter-fram...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/82H04N19/176H04N19/117H04N19/147
CPCH04N19/117H04N19/147H04N19/176H04N19/82
Inventor 马思伟张新峰高文
Owner PEKING UNIV
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