A watermarking method based on Fresnel diffraction

The watermarking technology is a technique of embedding hidden multimedia information, such as images or sounds, specifically for a company or individual holding the copyright of the media. We propose a new method using a watermarking embedding method for the material with a method of processing based on Fresnel diffraction. A significant area of the original image is processed by Fresnel transform, a coded watermark is embedded in this area. With various distance parameters, the watermark can be hidden in different observable surfaces, and is difficult to discover. The results show that our method can provide multi-frequency domains for embedding watermarks, and also the robustness of the watermarking is enhanced.