Abstract
In this paper, a quick table look-up optimization algorithm is presented to solve the problems of long table look-up time for CAVLC decoding in H.264/AVC. The achievement of the new algorithm rests that we make full use of the hash table query and index technology to improve the table look-up speed for CAVLC decoding. The basic idea of the new algorithm is that we take the number of zero in code prefix calculated from input bit-stream as index key of the first level, the value of codeword suffix as index key of the second level, then through index key of the one and second index key above, we can quickly get the decoded codeword located in the third level in a hash table built, which can reduce a lot of table look-up time for CAVLC decoding in H.264/AVC. The simulation results show that our proposed schemes based on hash-index method can reduce about 40% table look up time for CAVLC decoding compared with TLSS method, without degrading video quality.
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