Research On Digital Watermarking Algorithm Based On The Fractional Fourier Transform

With the development of the network and the multimedia technology, the application of the digital product is more and more wide. The information security becomes the concern in people's life. Especially, the copyright protection of digital product has become an urgent problem. Digital watermarking technology is an effective way of copyright protection, and it becomes a focus in the information security domain. On the base of the fractional Fourier transform theory, what the author has studied and realized mainly are as follows: (1) The fractional Fourier transform and it's fast algorithm have been analyzed. (2) A digital image watermarking algorithm has been proposed based on fractional Fourier transform and texture character. (3) Combining multiple-parameter discrete fractional Fourier transform theory, An image watermarking algorithm based on MPDFRFT has been proposed. The simulation experiment results have demonstrated that the two algorithms proposed not only realized watermark hidden well, and have better robustness and security.