Neslihan Gerek

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In this work, we consider the ISS (improved spread spectrum) watermarking in Malvar, H. S. and Florencio, D.A.F., (2003) framework, and propose a generalized version of it, termed "Generalized Improved Spread Spectrum" (GISS), where we achieve both host-interference cancelation and robustness to "translation" attacks up to some tolerance. In particular, we(More)
We report in this document on the development of a multimodal authentication benchmark during the eNTERFACE’ 07 workshop. The objective of creating such a benchmark is to evaluate the performance of multimodal authentication methods built by combining monomodal authentication methods (i.e., multimodal fusion). The benchmark is based on a graphical user(More)
iii ACKNOWLEDGEMENTS I would like to thank Kıvanç Mıhçak, my supervisor, for his many suggestions and constant support during this research. I am also thankful to Onur¨Ozye¸sil for sharing his knowledge of Detection and Estimation Theory and providing his comments on analytical derivations. And I am grateful to my parents for their patience and love. In(More)
In this work, we considered the improvement of robustness of spread spectrum watermarking. For spread spectrum watermarking, interference between the host signal and the watermark reduce the performance of the system. In order to prevent this interference, improved spread spectrum method has been proposed, which modulates the amplitude of the watermark in(More)
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