An efficient blind color image watermarking algorithm in spatial domain combining discrete Fourier transform

For achieving the purpose of rapid protection of color image copyright better, a novel color image blind watermarking algorithm is proposed in this paper, which integrates discrete Fourier transform (DFT) in spatial domain. According to the unique feature of the direct current (DC) component of DFT, two procedures of embedding and blind extracting watermark are accomplished in spatial domain utilizing the correlation principle between adjacent pixel blocks and different steps in different channels of color image, without real DFT. The experiment results demonstrate that the presented algorithm has strong robustness and high real time under the premise of better watermark invisibility, and solves the puzzles of slow running-speed and weak robustness of large capacity color image digital watermarking algorithm.