Embedding effciency is one of the most important factors to measure the information hiding perfomance. Our proposed method is based on Deng’s scheme in order to improve its embedding efficiency. Our proposed method embeds secret data by using the highly correlated SMVQ index and variable length coding. Experimental results show that the proposed method can increase embedding effciency significantly. Compared with Deng’s scheme

our proposed method achives not only 10.43%~19.80% reduction of bit rate but also 25.61%~46.95% increasment of embedding capacity. As a result

the embedding efficiency is increased to 41.33%~71.95% in total.