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An all-zero block detection method applied to hevc interframe coding

A detection method and inter-frame coding technology, applied in digital video signal modification, electrical components, image communication, etc., to achieve the effects of reducing computational complexity, improving coding efficiency, and increasing ratio

Active Publication Date: 2017-07-28
浙江欧托电气有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to propose an all-zero block early detection method based on the HEVC encoder in video surveillance, which can effectively reduce the frame difference caused by the noise signal by using the time domain denoising filter , introduce an amplification factor greater than 1 in the process of judging the all-zero block, so as to compensate the influence of the noise signal on the judgment of the all-zero block

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  • An all-zero block detection method applied to hevc interframe coding
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  • An all-zero block detection method applied to hevc interframe coding

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Embodiment Construction

[0042] For the transformed block TB after inter prediction and compensation, the prediction error value of each pixel is

[0043] e(x,y)=I(x,y)-B(x,y) (1)

[0044] (x, y) represents the pixel position in TB, I is the image to be coded, and B is the matching block corresponding to I in the reference image. If the area where the TB is located does not contain moving objects, ideally, the TB should be encoded as an all-zero block after inter-frame prediction and compensation. However, the actual recorded video signal is inevitably affected by noise. When the noise intensity is large Or when the quantization parameter QP is small, the above-mentioned all-zero block expectation is often difficult to realize.

[0045] Considering the TB residual data as an N×N matrix E, the two-dimensional DCT transformation can be written in the form of matrix multiplication as follows

[0046] F = AEA T (2)

[0047] where A is the DCT transformation matrix, and its elements are calculated by ...

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Abstract

The invention relates to the field of video image processing, in particular to an all-zero-block detection method applied to HEVC (high efficiency video coding) interframe coding. The all-zero-block detection method includes: firstly, before a transform block is subjected to actual DCT transform and quantization, pre-judging whether the transform block is an all-zero block or not according to distribution characters of DCT (discrete cosine transform) coefficients at all frequency locations of residual data, subjected to DCT transform, of a coding block after interframe prediction and compensation and the character that the sum of absolute values of in-block prediction error of the block located in a background area is to be decreased after subsequent denoising filtering on the basis of motion detection; secondly, inserting a motion-detection based time domain filter in a coder, and reducing influence of noise signals on video coding by adding one amplification factor larger than 1 into thresholds for judging the all-zero block under the premise of avoiding leading the denoising filtering into motion blur, and judging as many blocks located in the background area as possible to be all-zero blocks so as to favorably reduce computing cost of the coding process and increase coding compressing ratio.

Description

technical field [0001] The invention relates to the field of video image processing, in particular to an all-zero block detection method applied to HEVC inter-frame coding. Background technique [0002] As a new generation of video coding standards, High Efficiency Video Coding (HEVC) follows the block-based hybrid coding framework used by previous generation coding standards such as H.264, and uses intra-frame and inter-frame prediction to remove space and time. Redundancy, using discrete cosine transform (Discrete Cosine Transform, DCT) and entropy coding to remove statistical redundancy. [0003] In HEVC, the coding tree unit (Coding Tree Unit, CTU) is the basic processing unit, and each CTU includes a luma component coding tree block (Coding Tree Block, CTB) and two chrominance component CTBs. HEVC supports dividing the CTB into smaller blocks in the form of a quadtree. The leaf nodes of the tree division structure form a coding unit (Coding Unit, CU), which contains a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/124H04N19/176H04N19/625
Inventor 陈卫刚李晓楠
Owner 浙江欧托电气有限公司
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