cqvip:Lossless data hiding can restore the original status of cover media after embedded secret data are extracted.In 2010,Wang et al.proposed a lossless data hiding scheme which hides secret data in vector quantization(VQ) indices,but the encoding strategies adopted by their scheme expand the final codestream.This paper designs four embedding and encoding strategies to improve Wang et al.'s scheme.The experiment result of the proposed scheme compared with that of the Wang et al.'s scheme reduces the bit rates of the final codestream by 4.6% and raises the payload by 1.09% on average.
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