Abstract:

An improved algorithm based on the reversible difference expansion(DE) algorithm put forward by Tian is proposed by analyzing the ways that how the host image pixels' differences correlation influence the continuation of 0,1 of location map.The proposed algorithm takes advantage of the pixels' differences correlation to improve the efficiency of location-map compressing and to solve capacity limits caused by crude compression of location map.The experiment results show that the proposed algorithm can notably improve capacity with a improved location-map compression efficiency by ~ 35% and a PSNR by 1 dB on average.

Key words: difference expansion;steganography capacity;location map;compression