ROTATION, SCALING, AND TRANSLATION-INVARIANT MULTI-BIT WATERMARKING BASED ON LOG-POLAR MAPPING AND DISCRETE FOURIER TRANSFORM (FriPmPO1)

Author(s) : Wilson Fung (SANYO Electric Co., Ltd., Japan) Akiomi Kunisa (SANYO Electric Co., Ltd., Japan)

Abstract : 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.

Menu