Zero-watermarking algorithm based on Shearlet transform and Hu moment

Digital watermarking technology is widely used in copyright protection. To enhance the robustness as well as the imperceptibility of the watermarking algorithm while taking resist geometric attacks and non-geometric attacks into consideration, this paper proposed a zero-watermarking algorithm based on Shearlet transform and Hu moments for better realizing copyright protection. First Carry out Shearlet transform and block discrete cosine transform on the carrier image. Then calculate the Hu moment in blocks to construct the feature matrix, and construct the zero-watermark. The algorithm improves the security of watermarking images with Kent chaotic map encryption. To test the algorithm, high-intensity general attacks and their combination attacks are performed on images of different textures. The experimental results show that the normalized cross-correlation values all breaking 0.99 and the peak signal-to-noise ratio all breaking 75.80. The scheme not only has perfect imperceptibility but also can effectively resist high-intensity general attacks and their combination attacks, and has strong robustness.