Analysis and Reduction of Embedding Error for a Semi-Reversible Image Authentication Watermark

F. Ahmed and I.S. Moskowitz (USA)


Watermark, Medical Imaging, Discrete Fourier Transform, Image Authentication, Semi-reversible


We discuss an image authentication technique based upon embedding a robust signature into the image. Since any embedding process introduces errors and subsequently de grades image quality, we present a technique of analyzing embedding errors and develop a recursive embedding algo rithm that can be “reversed” after the authentication deci sion is made. This partial reversal in the detector results in a semi-reversible watermark that does not give back perfect image reconstruction; however it is shown to have good ro bustness qualities and compares well to related techniques reported in the literature. We apply our method to medical imagery in a telehealth application.

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