High Capacity Information Hiding Methods in DCT Field for BMP Color Images
A NLMB-DM (Nonlinear Multi-bit Dither Modulation) method which can embed information into BMP color images with high capacity is proposed in this paper. On the basis of NLMB-DM method, two adaptive methods which separately use the idea of RDM (Rational Dither Modulation) method and Watson visual model are brought forward. The results show that these 3 methods both have the property of high capacity, good imperceptibility and low bit error rate.