ROTATION, SCALING, AND TRANSLATION−INVARIANT MULTI−BIT WATERMARKING BASED ON LOG−POLAR MAPPING AND DISCRETE FOURIER TRANSFORM (FriPmPO1)
نویسندگان
چکیده
This paper proposes an RST−invariant multi−bit watermarking system based on LPM and DFT. This system embeds the watermark in a rotation and translation invariant domain obtained by first acquiring log−polar mapped DFT (LPM−DFT) magnitudes of an image, and then taking the magnitude of the 1−dimensional DFT along the angular axis of this LPM−DFT magnitudes. Neither the original cover image nor a presumed watermark is required during watermark extraction. Scaling invariant is accomplished by a simple search along the log−radius axis. Simulation results indicate that this new system has high robustness against RST distortion and moderate robustness against image compression such as JPEG.
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My general research interests include image processing, numerical analysis, algebra, combinatorics, differential equations, neural networks, pattern recognition, and statistics. I have taken a multitude of courses at the graduate level in mathematics, applied mathematics, computer science and statistics. I am particularly interested in mathematical problems that are driven by applications. Beca...
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