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All-zero-block detection method applied to HEVC (high efficiency video coding) interframe coding

A detection method and inter-frame coding technology, applied in the direction of digital video signal modification, electrical components, image communication, etc.

Active Publication Date: 2014-12-10
浙江欧托电气有限公司
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  • Abstract
  • Description
  • 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

Method used

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  • All-zero-block detection method applied to HEVC (high efficiency video coding) interframe coding
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  • All-zero-block detection method applied to HEVC (high efficiency video coding) interframe coding

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Embodiment Construction

[0042] The transformed block TB after inter-frame 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 the 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, after inter-frame prediction and compensation, the TB should be coded as all-zero blocks. However, the actual recorded video signal is unavoidably affected by noise. When the intensity of the noise is large Or when the quantization parameter QP is small, the aforementioned all-zero block expectation is often difficult to realize.

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

[0046] F=AEA T (2)

[0047] Where A is the DCT transformation matrix, and its elements are calculated as follows

...

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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 present 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 video coding standard, High Efficiency Video Coding (HEVC) follows the block-based hybrid coding framework used in 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 (DCT) and entropy coding to remove statistical redundancy. [0003] In HEVC, a coding tree unit (Coding Tree Unit, CTU) is a basic processing unit, and each CTU includes a luma component coding tree block (CTB) and two chrominance components CTB. HEVC supports the division of CTB into smaller blocks in the form of a quadtree. The leaf nodes of the tree structure form a coding unit (CU), which contains a coding block (CB) for luminance and chrominance components. And the cor...

Claims

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Application Information

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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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