A novel anti-geometrical attack digital watermark algorithm based on Contourlet transform and human visual system

摘要

Digital watermark technology plays an important role in the field of information security. A novel image watermark scheme based on Contourlet transform and human visual system is proposed. The original carrier image was executed in Contourlet transform and four various directions of the second level subband was indicated, afterwards, the scrambled digital watermark is embedded in them. The experimental results show that the proposed watermark algorithm is efficient and simple. The embedded watermark host images are not apparent distortion and the extracted watermark is easily discernible and accurate. The algorithm can resist all kinds of geometrical attacks and meet requirement of imperceptibility and robustness.