Parallel non-zero coefficient context modeling method for binary arithmetic coding

Abstract

The invention discloses a parallel non-zero coefficient context modeling method for binary arithmetic coding, and relates to a context modeling technology for video coding. The method is proposed to solve the problem that the data throughput rate of a coding system is reduced because the conventional binary arithmetic coding generates a data dependency relationship on the context in the context modeling process of non-zero coefficients. The method comprises the following steps of: 1, defining the number of coefficients and non-zero coefficients in a transform quantification block; 2, performing binarization on the non-zero coefficients to obtain a bin sequence; 3, performing context modeling on a first context according to the position information of the non-zero coefficients and the number of the non-zero coefficients in the transform quantification block; 4, calculating the probability distribution of the non-zero coefficients, the absolute value of which is abs (Li) in the first context value; 5, subtracting 1 from the absolute value of Li, and performing binarization; and 6, performing context modeling by using the equal probability distribution. By using the method, the context modeling processes of different non-zero coefficients can be simultaneously performed, and parallel execution of multiple context modeling processes in the coding process is realized.

Description

technical field [0001] The present invention relates to context modeling techniques for video coding. Background technique [0002] With the improvement of people's requirements for video quality, new video application forms such as high-definition and ultra-high-definition video have emerged. In this high-resolution and high-quality video appreciation application, the high-bit-rate code stream must be decoded in real time to ensure real-time playback of the video. [0003] Binary arithmetic coding is favored for its high coding efficiency and low complexity. [0004] Existing binary arithmetic coding mainly includes context-adaptive binary arithmetic coding CABAC in the international video coding standard H.264 / AVC and context-based binary arithmetic coding CBAC in the Chinese video coding standard AVS. Their coding frameworks are as follows: figure 1 shown. from figure 1 It can be seen from the figure that the object encoded by the binary arithmetic coder is essentiall...

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Problems solved by technology

[0019] In order to solve the problem that the existing binary arithmetic coding has a dependence on the data generated by the context in the context modeling process of the non-zero coefficients, which reduces the data throughput rate of the coding system, the proposed binary arithmetic coding can be parallelized The non-zero coefficient context modeling method of

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