Study of reversible information hiding scheme based on CARDBAL2 and DCT

Taking advantage of the feature that the energy of the image would gather and spread on four components (LL₂, LH₂, HL₂ and HH₂) in the sub-image after first-order CARDBAL2 multi-wavelet transform, propose an Information Hiding Algorithm based on CARDBAL2 transform and DCT. According to the algorithm, LL₂ is embedding module of robust parameters (odd-even verification data, scrambling optimization parameters and Hash value of information). Embed hiding Information in LH₂ and HL₂ with RAID4 and contrast detection data in HH₂. Choose different DCT coefficient interval in LL₂, LH₂ and HL₂. In aspect of information processing, using Logistic map and optimistic algorithm, improve the consistence of the embedded data bits´ order and the character of the sub-image. The algorithm can increase invisibility and robustness separately by 2.19% and 30.92% averagely. The algorithm has an obvious advantage against cutting. Its sensitivity of image tampering can reach to 98% or more and it has an excellent ability against steganalysis.