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HEVC intra-frame prediction mode rapid selection method

A technology of intra-frame prediction mode and prediction mode, which is applied in the field of video coding and can solve problems such as high computational complexity

Inactive Publication Date: 2016-08-10
XIAN UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] The increase of prediction mode improves the accuracy of intra prediction, but it also brings very high computational complexity

Method used

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  • HEVC intra-frame prediction mode rapid selection method
  • HEVC intra-frame prediction mode rapid selection method
  • HEVC intra-frame prediction mode rapid selection method

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Embodiment Construction

[0013] The method proposed by the present invention first selects 14 prediction modes to enter into the calculation of the rate-distortion cost, which greatly reduces the amount of computation of the cost function; after screening again, it ensures that each prediction mode can be covered, ensuring that the method is effective for all prediction modes applicability. After these two steps of screening, the encoding time is reduced and the encoding efficiency is improved under the premise of ensuring that the video quality and bit rate are basically unchanged.

[0014] Concrete realization steps of the present invention are:

[0015] Initial screening: select the strong texture direction of the prediction unit PU, and filter out the weak texture directions that are close to the strong texture direction; the strong texture directions selected through rough screening are: horizontal direction, vertical direction, diagonal direction, horizontal direction Up 30°, horizontally up 60...

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Abstract

The invention discloses an HEVC intra-frame prediction mode rapid selection method. The method is aimed at the problem that the calculation complexity is high due to increasing prediction modes in intra-frame prediction. On the basis that the prediction direction difference of adjacent angle prediction modes is less than 10 degrees, coarse screening is carried out in the strong grain direction of a PU (Prediction Unit) for intra-frame prediction; then rate-distortion optimizing calculation is carried out on the prediction modes after coarse screening; and secondary screening is carried out on the first three modes with minimum cost values. The candidate modes with maximum probability of being the optimum prediction mode can be found out rapidly and precisely by carrying out primary screening and secondary screening on the 35 prediction modes, and the calculation complexity of the original intra-frame prediction coding algorithm is effectively reduced.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to a method for quickly selecting an intra prediction mode in High Efficiency Video Coding (HEVC for short). technical background [0002] In January 2010, ITU-T VCEG (Video Coding Experts Group) and ISO / IEC MPEG (Moving Picture Experts Group) established the JCT-VC (Joint Collaborative Team on Video Coding) joint group. Developed a new generation of high-efficiency video coding standard: HEVC, whose core purpose is to double the compression efficiency on the basis of H.264 / AVC. [0003] HEVC intra-frame prediction is to use the encoded pixels of the same frame to predict the pixels to be encoded. The specific process is as follows: First, rate-distortion optimization (RDO, Rate Distortion Optimization) is performed, traversing 35 prediction modes, and calculating the respective generation value; then judge the most probable prediction mode (MPM, Most Probable Mode), a...

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Application Information

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IPC IPC(8): H04N19/11H04N19/147
Inventor 朱筠谢晓燕王欢刘镇弢
Owner XIAN UNIV OF POSTS & TELECOMM
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