By Frank Y. Shih

This ebook intends to supply a finished evaluate on varied points of mechanisms and strategies for info defense. it really is written for college kids, researchers, and execs learning within the box of multimedia safeguard and steganography. Multimedia protection and steganography is mainly correct as a result international scale of electronic multimedia and the speedy progress of the net. electronic watermarking expertise can be utilized to assure authenticity and will be utilized as evidence that the content material has no longer been altered because insertion. up to date thoughts and advances in watermarking are explored during this re-creation. The combinational spatial and frequency domain names watermarking method presents a brand new idea of enlarging the embedding means of watermarks. The genetic set of rules (GA) dependent watermarking process solves the rounding blunders challenge and supply an effective embedding strategy. every one bankruptcy presents the reader with a basic, theoretical framework, whereas constructing the huge complicated recommendations and contemplating the basic ideas of the electronic watermarking and steganographic structures. numerous strong algorithms which are awarded all through illustrate the framework and supply suggestions and instruments in figuring out and imposing the basic principles.

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That is, L (i , j ) = D (i , j )− O (i , j ). 31 Mathematical Preliminaries c (i , j ): The value of coefficient (i , j ) in the transformed image. S n (i , j ): The significant record of coefficient (i , j ). It is determined by 1, Sn (i, j ) =  0, if | c(i, j ) | ≥ 2 n . 18) otherwise SPIHT coding algorithm : 1. 15; set the LSP and LIS to be empty; add all elements in H into the LIP. 2. 1 For each entry (i , j ) in the LIP do output Sn (i, j ) ; if Sn (i, j ) = 1 , then move (i , j ) into the LSP and out the sign of c (i , j ).

Reliable IT Systems , Vieweg, Germany, 1995, pp. 251–263. Berghel, H.  , 101, 1996. Cox, I. , Secure spread spectrum watermarking for images audio and video, in Proc. IEEE Int. Conf . Image Processing , 1996, 243. Chambers, W. , Basics of Communications and Coding , Oxford Science, Clarendon Press, Oxford, 1985. 3 Mathematical Preliminaries This chapter introduces the mathematical preliminaries of digital watermarking techniques for different embedding purposes and domains, and presents some commonly used operations in digital watermarking, including least-significant-bit (LSB) substitution, the discrete Fourier transform (DFT), the discrete cosine transform (DCT), the discrete wavelet transform (DWT), random sequence generation , chaotic maps , error correction code (ECC), and set partitioning in hierarchical trees (SPIHT).

In other words, private watermarking techniques invest all efforts to make it impossible for unauthorized users to extract the watermark— for instance, by using a private, pseudorandom key. This private key indicates a watermark’ s location in the host image, allowing insertion and removal of the watermark if the secret location is known. In contrast, watermarking techniques that allow anyone to read the watermark are called public . Public watermarks are embedded in a location known to everyone, so the watermark detection software can easily extract the watermark by scanning the whole image.

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