AVS2 inter-frame prediction mode rapid decision method

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...

AI Technical Summary

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 a certain effect on reducing the mode calculation of the current block, they are often due to The incomplete utilization of information produces errors, and the errors will affect the prediction of the next coding unit

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