A Phase Watermarking Algorithm of Digital Images
Weiwei Wang · 2001
A discrete FOURIER transform(DFT) based watermarking algorithm is proposed for copyright protection of digital still images. It embeds a binary random sequence as a watermark into the phase components of important DFT coefficients of an image, and a correlation function is used in the watermark detecting process. Experimental results show the watermark is invisible, and the algorithm is robust to common image processing operations such as JPEG compression, cropping, resizing, median value filtering and noise perturbation.