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Self-adaptively dividing method for code units in high-efficiency video coding

A technology for video coding and coding unit, applied in the field of communication, can solve the problems of not considering the correlation relationship, the number of optional division modes, affecting the efficiency of CTB division and representation, etc., to achieve the effect of improving video compression efficiency and increasing the number of

Inactive Publication Date: 2011-01-05
XIDIAN UNIV
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Problems solved by technology

[0006] Since the CTB division method proposed by JCT-VC uses LCTB of fixed size as the basic unit to complete the encoding of the entire video sequence, it does not consider the correlation between adjacent frames and the relationship between CTB modes, which will affect the CTB division. expressive efficiency
[0007] At the same time, in the CTB division method proposed by JCT-VC, when the size of the video frame is not an integer multiple of LCTB, the number of optional division modes of LCTB at the boundary is very small, and the existing division modes cannot fully reflect the characteristics of video content , so the above-mentioned CTB division method will affect the video compression efficiency

Method used

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Embodiment Construction

[0036] refer to Figure 4 , the specific implementation steps of the first embodiment of the present invention include the following:

[0037] Step 1, traverse the entire video sequence, select the optimal largest coding unit FLCTB and smallest coding unit FSCTB for each video frame by using the rate-distortion optimization method from the value range of the largest coding unit FLCTB and the smallest coding unit FSCTB, and select The optimal FLCTB and FSCTB are written into the code stream in any of the following ways;

[0038] (1a) Directly write FLCTB into code stream;

[0039] (1b) Write the difference between the FLCTB of the current frame and the FLCTB of the reference frame into the code stream.

[0040] Step 2, determine the video coding method according to the video format being an integer multiple of FLCTB, if the video format is an integer multiple of FLCTB, then directly complete the compression of the video frame according to the coding method proposed by JCT-VC,...

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Abstract

The invention discloses a self-adaption dividing method for code units in high-efficiency video coding, which mainly solves the problems that a largest code unit and a smallest code unit in the division of the code units in the prior art can not be regulated according to the characteristics of video content, and the dividing mode quantity of blocks on the boundary of a video frame is few. The method comprises the steps of: firstly, adopting the rate distortion rule or the relativity among video frames to self-adaptively determine the largest code unit and the smallest code unit in each video frame; secondly, expanding a rectangular block within the video frame in the largest code unit on the boundary of a video frame into a square block, and dividing the square block; then, marking the rectangular blocks after dividing, and carrying out frame prediction to the rectangular blocks after dividing; and finally, transforming, quantizing and entropy coding to prediction residuals. The invention has the advantage of high video compression efficiency, and can be applied to high-performance video coding standards.

Description

technical field [0001] The invention belongs to the communication field. It involves the division method of coding units in video coding, including the acquisition technology of the largest coding unit FLCTB and the smallest coding unit FSCTB of frame parameters and the division technology of coding units at frame boundaries, which can be used to represent video content at any resolution in video coding and improve video quality. Coding efficiency. Background technique [0002] With the rapid development of network technology, the maturity and improvement of video coding technology, and the continuous improvement of transmission technology, video services have been widely used. How to better realize efficient video coding has always been a research hotspot in the video field. Recently, ITU-T SG16 Q.6 and ISO / IEC JTC1 / SC29 / WG11 jointly established the video coding cooperation group JCT-VC to formulate the high-efficiency video coding HEVC standard. The purpose is to furthe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/50H04N19/196H04N19/567
Inventor 李维杨付正万帅元辉
Owner XIDIAN UNIV
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