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A Pattern-Search Method for H.264/AVC CAVLC Decoding

In this paper, a new implementation method is proposed for context-adaptive variable length coding (CAVLC) used in H.264 baseline profile. We analyze the correlation between bit patterns and 4times4 (or 2times2) blocks and have an idea of a pattern-search method before CAVLC decoding. If a pattern is matched in our look-up table, we can skip the standard CAVLD procedure and reconstruct a block directly. However, if there is not any pattern matched in the table, we have to reconstruct a block by CAVLD. Our lookup tables are built up according to our statistics and analysis. The experimental results show that the performance can be improved 10% compared with the standard CAVLD procedure