A Zero-Watermarking Algorithm for Medical Images Based on Gabor-DCT.

The development of digital age accelerated the development of digital medical systems, but it also inevitably brings security problems of the transmission and storage of medical images in the network. The wide use of digital watermarking technology in medical images has effectively improved such problems, but the research on the medical image watermarking algorithm is still less and immature. How to improve the invisibility and robustness of watermark information is a difficult problem in the medical image watermarking algorithm. In this paper, a zero watermarking algorithm for medical images based on Gabor-DCT is proposed. The watermark information first encrypted by a Logistic chaotic map and then combined with the medical image feature vector extracted by the Gabor-DCT algorithm to improve the robustness of the watermark information. At last, the watermark is extracted and embedded by zero watermark technology, which improved the invisibility of the watermark information. Experimental results show the proposed algorithm can effectively resist both common attacks and geometric attacks, and has good invisibility and robustness.