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This paper presents a method for robust watermarking of medical image using DFT. A feature vector of the medical image is utilized to enhance the robustness against rotation, scaling, and translation. The proposed algorithm utilizes the medical image's feature, Hash function, the third party authentication. We describe how to obtain the feature vector of medical image and embed and extract the watermarking...
Medical images must be stored in a secure way to preserve unauthorized disclosure of patient data. This paper proposes an algorithm of robust multiple watermarks to serve these purposes using DWT and DFT. A part of sign sequence of DWT and DFT coefficients are used as feature vector for enhancing the robustness against rotation attacks, scaling attacks, translation attacks and cropping attacks. Moreover,...
It is important to enhance and detect nodules in CT images in order to identify the lung cancer at early stage. Nodules which are included in medical image generally have multiple size and scale, and have blob-like structure. Recently, 3D multiscale filter approach is proposed for lung nodules detection. However, the 3D method take too much computing time to be applicable in real diagnose systems...
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