The medical image watermarking algorithm based on DFT and logistic map

When medical images are transmitted and stored in hospitals, Strict security, confidentiality and integrity are required. However, the transmission of wireless and wired networks has made the medical information vulnerable to attacks like tampering, hacking, etc. And the Region of Interest(ROI) of medical images can´t stand significant changes. In order to solve these problems, we have proposed an algorithm, which introduces the digital watermarking technology to increase the security of medical images. By using a part of sign sequence of DFT coefficients as the feature vector of images, we can avoid the sophisticated process of finding ROI of medical images. At the same time, the watermarking image is encrypted by Logistic Map to enhance its confidentiality. The experimental results show that the scheme has strong robustness against common attacks and geometric attacks.