AVS2 inter-frame prediction mode rapid decision method

An inter-frame prediction mode and mode technology, which is applied in the direction of digital video signal modification, electrical components, image communication, etc., can solve the problems of coding unit influence, incomplete information utilization, errors, etc.

Inactive Publication Date: 2017-11-10
SHANGHAI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

In the past, there were many studies on this aspect, such as using the prediction mode of the surrounding encoded image blocks as a candidate mode to predict the block currently being encoded. Although these methods have

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  • AVS2 inter-frame prediction mode rapid decision method
  • AVS2 inter-frame prediction mode rapid decision method
  • AVS2 inter-frame prediction mode rapid decision method

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Embodiment Construction

[0036] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0037] On the computer platform, the interframe coding part programming of AVS2 reference code realizes the method among the present invention, and concrete realization steps are as follows figure 1 shown. Proceed as follows:

[0038] (1) Before encoding the current CU, select the CU with the same depth corresponding to the previous frame, and the CU with the same depth at the left and upper adjacent positions of the same frame as the reference CU, and calculate the texture complexity of each reference CU and the current CU, And select the one closest to the texture of the current CU from all reference CUs as the best reference block, and record the division mode of the best reference block as Mode0;

[0039] (2) Calculate the rate-distortion cost of the NO_SPLIT mode, and set the best prediction mode BestMode of the current CU to the NO_S...

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Abstract

The invention provides a rapid mode decision method specific to the problem of AVS2 inter-frame coding complexity. The method comprises the following steps: during inter-frame coding, calculating texture complexities in a horizontal direction and a vertical direction of a coding block firstly, calculating a horizontal symmetrical division mode (HOR_SYM) if the texture complexity in the horizontal direction is lower, otherwise calculating a vertical symmetrical mode (VER_SYM); meanwhile, using a prediction mode of an optimal reference block as a reference to avoid wrong judgment due to external factors; and if the horizontal symmetrical or vertical symmetrical mode is a current optimal mode, further analyzing the texture of a prediction unit (PU) in a horizontal asymmetrical or vertical asymmetrical mode, and choosing whether to perform calculations of the asymmetrical modes or not according to texture features. Through adoption of the method, calculations of five modes can be reduced at most; calculations of three modes can be reduced at least; the coding complexity can be lowered remarkably; and meanwhile only little coding performance is lost.

Description

technical field [0001] The invention relates to a fast judgment method of an AVS2 inter-frame prediction mode, which is an algorithm based on the time-space domain correlation and texture speciality of coding blocks. Background technique [0002] AVS2 is a new generation of national independent audio and video coding standards. Its compression efficiency is about double that of the previous generation standard (AVS1 for short) and the international standard H.264 / AVC, especially in scene video coding. AVS2 uses many advanced coding techniques, the most representative ones are the flexible quadtree division structure and diverse prediction modes. Among them, in terms of intra-frame prediction, there are 30 directional prediction modes and 3 non-directional prediction modes for brightness; in terms of inter-frame prediction, inter-frame prediction modes such as double forward prediction are added. Advanced coding technology improves the coding efficiency, but the coding proce...

Claims

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Application Information

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IPC IPC(8): H04N19/109H04N19/147H04N19/176H04N19/563
CPCH04N19/109H04N19/147H04N19/176H04N19/563
Inventor 滕国伟产小红赵海武李国平王国中
Owner SHANGHAI UNIV
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