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An Iterative Template Matching Algorithm Using the Chirp-Z Transform for Digital Image Watermarking

By Shelby Pereira And, Shelby Pereira and Thierry Pun


INTRODUCTION The popularity of the World Wide Web has clearly demonstrated the commercial potential of the digital multimedia market. Unfortunately however, digital networks and multimedia also afford virtually unprecedented opportunities to pirate copyrighted material. As a result, digital image watermarking has become a an active area of research. Techniques for hiding watermarks have grown steadily more sophisticated and increasingly robust to standard image processing techniques. Current techniques embed watermarks by means of adding a spread spectrum (SS) signal in the spatial domain or a transform domain such as the DCT, DFT, or Wavelet transform. In order to render the algorithm resistant to cropping, scaling and rotation, the idea of using an invisible template embedded in the DFT domain has also been adopted. 1 The template contains no information but is merely a tool used to recover possible transformations in the image. Ultimately, the recovery o

Year: 2000
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