Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (4): 492-496.DOI: 10.12068/j.issn.1005-3026.2018.04.008

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Robust Watermarking Algorithm Based on Combination of Phase and Amplitude of CS-SCHT Domain

DU Li, GAO Li-ping, WEN Xin   

  1. School of Computer Science & Engineering, Northeastern University, Shenyang 110169, China.
  • Received:2016-11-23 Revised:2016-11-23 Online:2018-04-15 Published:2018-04-10
  • Contact: DU Li
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Abstract: In order to improve the robustness of watermarking algorithms, a watermarking algorithm based on the phase and amplitude of CS-SCHT coefficient was proposed. Since the anti-interference ability of the phase is stronger than that of the amplitude, and the amplitude is invariant to rotation, shear, and scaling, a watermark was divided equally and then embedded in the phase and amplitude of the same transformation coefficient, respectively, which can combine the advantages of phase algorithms and amplitude algorithms and achieve the purpose of improving the robustness. Simulation results showed that the PSNR of the proposed algorithm is 47.4517dB without attack, and the normalized correlation coefficients are above 0.9 with various attacks. The proposed algorithm is more invisible. Moreover, it is robust to brightening, rotation, cutting, noise attack, and low-pass filter attack of Gaussian and JPEG compression.

Key words: digital image, copyright protection, digital watermarking, Hadamard transform;conjugate symmetric-sequency complex

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