A blind watermarking algorithm based on fractional Fourier transform and visual cryptography

作者：Rawat Sanjay^*; Raman Balasubramanian

来源：Signal Processing, 2012, 92(6): 1480-1491.

DOI：10.1016/j.sigpro.2011.12.006

• Watermarking
• Visual cryptography
• Singular value decomposition
• Fractional Fourier transform

This paper presents a robust copyright protection scheme based on fractional Fourier transform (FrFT) and visual cryptography (VC). Unlike the traditional schemes, in our scheme, the original image is not modified by embedding the watermark into the original image. We use the visual secret sharing scheme to construct two shares, namely, master share and ownership share. Features of the original image are extracted using SVD, and are used to generate the master share. Ownership share is generated with the help of secret image (watermark) and the master share, using VC technique. The two shares separately give no information about the secret image, but for ownership identification, the secret image can be revealed by stacking the master share and the ownership share. In order to achieve the robustness and security, the properties of VC, FrFT and SVD are used in our scheme. The experimental results show that the proposed scheme is strong enough to resist various signal processing operations.

• 出版日期2012-6