Invertible steganography is a kind of information hiding, in which a secret message is embedded in a carrier in such a way that the human visual system is less sensitive. Moreover, the original media is completely retrieved after the secret message is extracted. This chapter proposes a novel invertible steganography scheme with high embedding capacity using two-dimensional histogram shifting in the transform domain. We investigated that the DCT-quantized coefficients of each pair of similar blocks in the left and right views of stereo image commonly meet to values, and the secret bits are first partitioned into 3-bit groups and encoded into decimal form. The embedding direction histogram (EDH) is built and used for embedding. By using EDH to shift the middle frequency DCT-quantized coefficients of the two-dimensional histogram the proposed scheme archives the trade-off between imperceptibility and embedding capacity. The experimental results indicated the method had better performance in comparison to previous schemes.
Tạp chí khoa học Trường Đại học Cần Thơ
Lầu 4, Nhà Điều Hành, Khu II, đường 3/2, P. Xuân Khánh, Q. Ninh Kiều, TP. Cần Thơ
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