Realization of digital image watermarking encryption algorithm using Fractional Fourier Transform

This paper discussed the definition of fractional Fourier transform(FRFT), the basic principles of the watermark, analysis approach of the energy distribution, magnitude and other characteristics in Fractional Fourier Domain. On this basis, random sequence watermarking algorithm by using Fractional Fourier Transform was proposed, and simulation experiments was carried. Experimental results show that the algorithm has a certain degree of robustness on conventional image processing such as JPEG compression, Gaussian low-pass filter. At the same time, it can increase the security and maneuverability of the watermark while change the order arbitrarily.