By Husrev T Sencar; Ramkumar Mahalingam.; Ali N Akansu
Cutting-edge insurance of electronic content material safety strategies! Preliminaries; Contents; 1. creation; 2. Frameworks for info Hiding; three. verbal exchange with aspect details and information Hiding; four. style I (Linear) info Hiding; five. sort II and kind III (Nonlinear) facts Hiding tools; 6. complex Implementations; 7. significant layout concerns; eight. facts Hiding purposes; Appendices; Bibliography; Index
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Extra info for Data hiding fundamentals and applications : content security in digital media
Each quantizer of the set is uniquely described by a set of reconstruction points that are nonoverlapping with other sets of reconstruction points. Therefore, each ﬁnite state of U is a sequence with values restricted to reconstruction values of the designated quantizers. The terms X and Xt are the embedding distortion due to quantization and the processing distortion, respectively. The codeword corresponding to a message is the distortion signal introduced into the host signal as a result of the embedding operation, S − C.
They proceeded to derive the capacity of this channel assuming an input alphabet X , an output alphabet Y , an auxiliary alphabet U , and a ﬁnite set C of side information, where X , Y , U , C ∈ N . 1) where pX (x) is the probability mass function of a random variable X, and I(X, Y ) is the mutual information between two random variables X and Y . Heegard et al. , also using this formulation, extended the idea to establish achievable storage rates for memory when defect information is given only to the encoder or the decoder and completely to the decoder but partially to the encoder.
In the ﬁgure, × and ◦ denote the reconstruction points associated with the quantizers corresponding to two watermark samples. 4 Codebook Generation for Data Hiding Methods 45 from being optimal when the channel noise level is low. , in order to embed the information symbol denoted by ◦ in a host signal coefﬁcient that is at the far left of the threshold, an arbitrarily large embedding distortion needs to be introduced to translate it to the region R◦ ). On the contrary, the layout of the decision regions of the type II detector ensure reliable detection from all stego coefﬁcients, albeit only up to channel distortions of power P.