Research on Watermarking Algorithm of Strong Robustness Based on DFT
Xiaodan Zhang · Chongqing Shifan Daxue xuebao. Ziran kexue ban · 2010
Digital watermarking technology has been a solution in the digital multimedia content copyright issues and the principal instrument of certification,which is the focus of academic research.In this paper,firstly,DFT and HVS were introduced,which have widely used in digital watermarking system,and a robust watermarking algorithm based on HVS and DFT was proposed.The algorithm add the watermark image in the middle frequency region of DFT coefficients with fixed intensity and the watermark image was embedded into the host image block with the order of variance.Finally,a lot of stimulation experiments were programmed by Matlab.Stirmark to simulate various attacks to watermarked image.The simulation results show that the proposed algorithm has good robustness and invisibleness.