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An Implementation of Robust Image Fingerprinting Based on DCT

Abstract. As a new technology of copyright protection, digital fingerprinting has played an important role in multimedia piracy tracking. In this paper, a new image fingerprinting scheme was presented. Including an embedding algorithm based on image dividing and DCT coefficients, an extracting algorithm based on image registration. In the algorithm implementation we enhance the robustness by skipping the smaller coefficients and improve the extracting accuracy by optimizing the transformation matrix of image registration. The experimental results show that our image fingerprinting scheme has good invisibility and robustness against noise, low-pass filtering and geometric attacks such as scaling, rotation and cropping.