Generic construction algorithms for symmetric and asymmetric RVLCs

In this paper, we propose several generic algorithms that can construct symmetric and asymmetric reversible variable length codes (RVLC). RVLC, adopted in emerging video coding standards such as MPEG-4 and H.263+, can be used to enhance the corresponding error resilience capability in the presence of transmission bit errors. Experimental results show that the proposed symmetric RVLC algorithm can produce codes with shorter average codeword lengths and shorter maximum codeword lengths. And the proposed asymmetric RVLC algorithms generate codes with either shorter average codeword lengths or shorter maximum codeword lengths, as compared to the existing approaches.