By Kirley M.
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Extra info for A Cellular Genetic Algorithm with Disturbances: Optimisation Using Dynamic Spatial Interactions
Most approaches rely on the introduction or exploitation of robust singularities in the watermark signal, which can be detected even after various geometrical deformations. This pilot signal which is also embedded into the cover image is often called reference watermark in opposition to the informative watermark which conveys a message. Two different classes of methods exist. In the first class, the pilot signal is distinct from the informative watermark. It is usually called a template signal and often consists in a signal exhibiting peaks in the magnitude of the Fourier spectrum of the image.
One can analyze the autocorrelation function of the periodic signal to determine which transformation the signal has undergone. This determination is achievable only when the number of periods represented in the signal is sufficiently large. 1 Weaknesses of watermarking schemes using periodicity ? 1: (a) Searching for synchronization with reference marks, (b) tiling an elementary pattern to reduce search space. This chapter will present an original generalization method to build periodic n-dimensional discrete signals and set out its advantageous properties for watermarking schemes.
Digital communication systems over noisy channels use channel coding techniques in order to achieve error-free transmissions. These techniques introduce a certain amount of redundancy in the transmitted message which enables a diminution of the rate of error at the price of a lower transmitted information rate. Specific forms of redundancy can enhance the watermark detection performances. However, introducing redundancy can also have 28 Chapter 3. 2-D periodic patterns for image watermarking security implications for the watermarking system.
A Cellular Genetic Algorithm with Disturbances: Optimisation Using Dynamic Spatial Interactions by Kirley M.