HEVC intra-frame prediction quick mode selection method based on texture analysis

A mode selection and intra-frame prediction technology, applied in the field of multimedia coding, can solve problems such as complex optimization problems, and achieve the effect of saving coding time and reducing the impact

Active Publication Date: 2014-01-15
北京畅景立达软件技术有限公司
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Problems solved by technology

Compared with the existing video coding standard H.264 / AVC, the optimization problem of coding unit division and prediction direction selection is more complicated

Method used

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  • HEVC intra-frame prediction quick mode selection method based on texture analysis
  • HEVC intra-frame prediction quick mode selection method based on texture analysis
  • HEVC intra-frame prediction quick mode selection method based on texture analysis

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specific Embodiment approach

[0073] Since the probability that the best prediction mode is close to the texture direction is high, the present invention uses several prediction directions around the main texture direction for angle prediction. The specific implementation is as follows:

[0074] (1) Define an array of candidate prediction modes with a size of 11, which is used to store the selected candidate prediction modes, including planar mode, DC mode, main texture direction and several prediction directions around the main texture direction. In the specific implementation of the present invention, four prediction directions are taken on both sides of the main texture direction.

[0075] (2) Obtain the prediction mode number mode corresponding to the main texture direction of the current prediction unit texture , and use formula (7) to calculate the angle prediction range [mode lef t, mode right ].

[0076] mode left ...

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Abstract

The invention discloses an HEVC intra-frame prediction quick mode selection method based on texture analysis. According to the method, before intra-frame prediction is carried out on an encoding tree unit, the main texture direction and the texture complexity of each 4*4 unit in the encoding tree unit are determined according to the sum of absolute values of gradients in the horizontal direction, the vertical direction, the lower left direction and the lower right direction, and division of the current encoding tree unit is determined according to the principle that a larger encoding unit is adopted in a texture smooth area and a smaller encoding unit is adopted in a texture complex area. During prediction, according to the main texture direction of the prediction unit, a plurality of prediction modes with least probability are eliminated, and rough mode selection and rate-distortion optimization mode selection are carried out according to an HEVC encoding standard. According to the HEVC intra-frame prediction quick mode selection method based on texture analysis, on the premise that encoding quality is guaranteed, the encoding speed can be obviously improved.

Description

technical field [0001] The invention belongs to the field of multimedia coding, and in particular relates to a fast mode selection method for intra-frame prediction aimed at the HEVC video coding standard, which is a method for dividing coding units and fast mode selection for prediction directions according to image texture analysis. Background technique [0002] With the release of the next-generation video coding standard HEVC (High Efficiency Video Coding), video coding efficiency has been further improved. Compared with the previous video coding standard H.264 / AVC, under the same coding quality, it can save nearly half of the code rate, but this is at the expense of coding complexity. How to minimize the complexity of the algorithm and significantly improve the encoding speed without changing the code stream structure and maintaining the original code rate is the key to the large-scale promotion and application of HEVC. [0003] Intra-frame coding can provide reference...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/103H04N19/50
Inventor 张永飞李哲李波
Owner 北京畅景立达软件技术有限公司
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