Abstract
This article introduces one adaptive binary arithmetic coding system based on context. H.264/AVC is a new video coding standard developed by ITU-T VCEG and ISO/IEC MPEG. It includes many new technology features, such as Multi-mode prediction, Flexible Macro block Ordering (FMO), integer transform, Universal Variable Length Codes (UVLC), Context-based Adaptive Binary Arithmetic Coding (CABAC), laying code, error restriction machine, etc. This paper introduced the Context-based Adaptive Binary Arithmetic Coding (CABAC) method presented in H.264/AVC. And it makes a comparison between CABAC and UVLC. Context-based Adaptive Binary Arithmetic Coding (CABAC) is a new entropy coding method presented in H.264/AVC that is highly efficient in video coding. In the method, the probability of current symbol will be estimated by using a well designed context model, which is adaptive and can approach to the statistic characteristic. Then an arithmetic coding mechanism will largely reduce the redundancy including inter-symbol redundancy. Compared with UVLC method in the prior standard, CABAC is complicated but efficiently reduce the bit rate.
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