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Rapid intra-frame mode decision method specific to high efficiency video coding standard

A high-efficiency video and coding standard technology, applied in the field of fast intra-frame mode decision, can solve problems such as unfavorable real-time coding, consuming large coding time, and difficult real-time application.

Active Publication Date: 2015-12-23
郑州轻大产业技术研究院有限公司
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Problems solved by technology

The high-efficiency video coding reference model HM (HEVCModel) provided by JCT-VC is optimized for full rate distortion when determining the intra prediction mode, that is to say, after traversing all intra prediction modes, the residual value of each mode is obtained. Then carry out the Hadamard transformation on the residual value to calculate its SATD v

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  • Rapid intra-frame mode decision method specific to high efficiency video coding standard
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  • Rapid intra-frame mode decision method specific to high efficiency video coding standard

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[0044] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation is given, but the protection scope of the present invention is not limited to the following embodiments.

[0045] see figure 1 , a fast intra-frame mode decision method for high-efficiency video coding standards, first select the prediction unit PU whose size is N×N from 4×4 to 64×64, and then use the Sobel edge detection operator to perform prediction unit PU Processing, determine the horizontal and vertical gradient values ​​of the prediction unit PU, further calculate the gradient direction and determine the direction mode, and the determination process ends. The steps are:

[0046] (1) Select a prediction unit PU whose size is N×N. The size of the prediction unit PU is selected from 4×4 to 64×64, that is, one of the ...

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Abstract

The invention discloses a rapid intra-frame mode decision method specific to a high efficiency video coding standard. The method comprises the following steps: (1) selecting a prediction unit (PU) being N*N in size; (2) calculating an average gradient value of pixel points in the PU with a Sobel operator; (3) determining a threshold value for judging an intra-frame prediction mode; (4) initially judging the intra-frame prediction mode according to the average gradient value of the pixel points in the PU and the threshold value for judging the intra-frame prediction mode; (5) calculating gradient directions of the pixel points in the PU according to a gradient value of each pixel point in the PU calculated by the Sobel operator; and (6) performing table lookup according to the gradient directions of the pixel points of the PU in order to determine the intra-frame prediction mode. In the rapid intra-frame mode decision method, a Sobel edge detection operator is adopted, so that the intra-frame decision speed is increased under the situation that the decision accuracy of a direction mode is kept constant; the complexity is low; the calculation amount is small; only a small amount of code rate is increased; and a large amount of coding time is saved.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to an intra-frame mode judgment method for video coding, in particular to a fast intra-frame mode judgment method for high-efficiency video coding standards. Background technique [0002] In recent years, with the popularization of high-definition video and various network videos, video compression technology has faced a lot of challenges. The Motion Picture Experts Group (MPEG) of ISO / IEC and the Video Coding Experts Group (VCEG) of ITU-T formed the Joint Collaborative Team Video Coding (JCT-VC), and jointly formulated the high-efficiency video coding standard H .265 / HEVC (High Efficiency Video Coding). The new generation of video coding standard H.265 / HEVC has added many new coding tools, so compared with the previous generation of video coding standard H.264 / AVC, the coding performance of H.265 / HEVC has been greatly improved. The texture complexity of high-definiti...

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Application Information

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IPC IPC(8): H04N19/11
Inventor 张秋闻赵进超崔伟王晓常化文吴庆岗李明英黄新彭张文帅赵小鑫
Owner 郑州轻大产业技术研究院有限公司
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