By Min Wu
Accomplished insurance of a huge and present sizzling topic.; info either theoretical in addition to functional aspects.; offers new facts hiding algorithms for photos and videos.; finds a few assaults and countermeasures for facts hiding structures, with a spotlight on electronic song.
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Extra info for Multimedia Data Hiding
For example, we generate marked coefficients v 1 and v 2 close to v1 and v2 such that v 1 > v 2 to embed a “1” and v 1 ≤ v 2 to embed a “0” . One can also enforce signs to embed a “1” or “0”, as used in [64, 65]. Extending the basic ways of enforcement, more sophisticated schemes can be designed and/or analyzed . Many proposed schemes in the literature that claimed to have the ability of non-coherent detection 2 belong to this category. It is the deterministically enforced relationship on I1 that removes the need of using original signal I0 .
This layer has three key elements, namely, (1) the mechanism for embedding one bit, (2) the perceptual model to ensure imperceptibility, and (3) the modulation/multiplexing techniques for hiding multiples bits. Protocols for achieving additional functionalities are built on top of this “physical layer”, for example, to handle uneven embedding capacity, to enhance robustness and approach capacity via error correction coding, and to CHAPTER 2. 2: Layered structure of a data hiding system. incorporate additional security measures.
TDMA/CDMA-type modulation (right) with total signal energy being fixed at E. The orthogonal modulation and TDMA/CDMA-type modulation can be compared by studying the distance between signal constellation points that represent the secondary data (Fig. 10). Considering the case of conveying B bits using total √ energy E. The minimum distance between signal points is 2E for orthogonal modulation, and is 2 E/B for TDMA/CDMA. When B > 2, orthogonal modulation gives smaller probability of error at a cost of detection complexity.