Context-Based 2D-VLC Entropy Coder in AVS Video Coding Standard

In this paper, a Context-based 2D Variable Length Coding (C2DVLC)method for coding the transformed residuals in AVS video coding standardis presented. One feature in C2DVLC is the usage of multiple 2D-VLCtables and another feature is the usage of simple Exponential-Golombcodes. C2DVLC employs context-based adaptive multiple table coding toexploit the statistical correlation between DCT coefficients of oneblock for higher coding efficiency. Exp-Golomb codes are applied to codethe pairs of the run-length of zero coefficients and the nonzerocoefficient for lower storage requirement. C2DVLC is a low complexitycoder in terms of both computational time and memory requirement. Theexperimental results show that C2DVLC can gain 0.34dB in average for thetested videos when compared with the traditional 2D-VLC coding methodlike that used in MPEG-2. And compared with CAVLC in H.264/AVC, C2DVLCshows similar coding efficiency.