By Frank Y. Shih
This e-book intends to supply a entire evaluation on varied facets of mechanisms and strategies for info defense. it truly is written for college students, researchers, and execs learning within the box of multimedia safety and steganography. Multimedia protection and steganography is mainly correct a result of international scale of electronic multimedia and the fast development of the net. electronic watermarking know-how can be utilized to assure authenticity and will be utilized as evidence that the content material has no longer been altered due to the fact that insertion. up-to-date strategies and advances in watermarking are explored during this re-creation. The combinational spatial and frequency domain names watermarking strategy offers a brand new proposal of enlarging the embedding skill of watermarks. The genetic set of rules (GA) established 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 large complicated concepts and contemplating the basic rules of the electronic watermarking and steganographic platforms. a number of powerful algorithms which are provided all through illustrate the framework and supply suggestions and instruments in figuring out and imposing the basic principles.
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Extra info for Digital Watermarking and Steganography
For each payload block, it contains both the RID and the data belonging to the higher-level block of XiL, j . 18a denotes an original image X and its three-level hierarchical results. Note that X 01,0 is the top level of the hierarchy, consisting of only one block, X . 18b shows the corresponding RID of each block, Xil, j . 18 An example of the hierarchical approach with three levels. 51 Digital Watermarking Fundamentals X33,3, we consider the following three RIDs: S33,3, S12,1, and S01,0 . After generating the payload block P33,3, we embed it into the LSB of the original image X on X33,3.
That is, the embedded data not only include the information of the corresponding block but also possess the relative information of the higher-level blocks. Therefore, a VQ attack cannot approximate an image based on a codebook that only records the information of each watermarked block. Let Xil, j denote a block in the hierarchical approach, where (i , j ) represents the spatial position of the block and l is the level to which the block belongs. The total number of levels in the hierarchical approach is denoted by L .
There are 24 possible embedding combinations. Among the 16 possibilities, only two cases of watermarks can be extracted correctly. 3 FRAGILE WATERMARKS Due to the popularity of computerized image processing, there are a tremendous number of software tools available for users to employ in modifying images. Therefore, it becomes a critical problem for a recipient to judge whether the received image has been altered by an attacker. 14. Fragile watermarks provide a means of ensuring that a received image can be trusted.