Watermarking algorithm in multiple-parameter discrete fractional Fourier transform domain
Zhaoxiang Zhang · Journal of North China Electric Power University · 2007
An image watermarking algorithm was proposed based on multiple-parameter discrete fractional Fourier transform(MPDFRFT).The watermark was firstly scrambled with Arnold transform by the algorithm.Then the algorithm took the advantage of space and frequency double domain signal representation property of the fractional Fourier transform.The original image and the watermark sequence were fractional Fourier transformed with different order vector,and watermarking signal transformed by FRFT was added in the characteristic area,the final watermark image was obtained by inversely transforming the joint spectra.The robustness of the watermark under different attacks such as noise,filter,crop and JPEG compression had been numerically analyzed also.Simulation experiment demonstrats that this algorithm has better robustness and security.