Robust Zero Watermarking Algorithm for Medical Images Based on Zernike-DCT

Digital medical system not only facilitates the storage and transmission of information but also brings security problems. Aiming at images, a robust zero watermarking algorithm for images based on Zernike-DCT is proposed. The first uses chaotic logic sequence to preprocess encrypt watermark, then performs edge detection Zernike moment processing original image get accurate points, discrete cosine transform (DCT) them feature vector. Finally, it combines perceptual Hash watermark technology generate key complete embedding extraction. has good robustness conventional geometric attacks, strong antinoise ability, high positioning accuracy, efficiency superior classical in extraction effect. It stable reliable algorithm.