Study of Reversible Information Hiding Scheme Based on GHM and Color Mod Vector Structure

Take advantage of the feature that the energy of the image would gather and spread on four components in the subimage after first-order GHM multi-wavelet transform. Propose an information hiding algorithm based on modifying the direction of color mod vector structure (CMVS) of four GHM first-order sub-images (LL₂, LH₂, HL₂ and HH₂). The direction of CMVS represents the information. The maximum change of direction angle is usually less than ¿/2^k. Embed robust parameters in LL₂, hiding information in LH₂ and HL₂ with RAID4, fragile sign in HH₂. Using the chaotic map and the genetic algorithm, improve the consistence of the embedded data bits´ order and the character of the sub-image. Experimental results indicate that the proposed scheme can increase invisibility and robustness separately by 22.49% and 16.78% averagely, and has certain ability against steganalysis such as the RS and higher order statistics based on wavelet coefficients. Moreover, the scheme has excellent sensitivity of image processing.