Affine invariant image watermarking scheme based on ASIFT and Delaunay tessellation

Watermarking algorithms that resist geometric combination attacks is currently a trend of research in this field. This paper proposed a geometrically invariant watermarking scheme based on the feature points of resistance to affine transformation. The scheme used Affine Scale Invariant Feature Transform (ASIFT) to detect the feature points of the carrier image and filtrated the established feature points group depending on anti-affine properties. The obtained feature points set obtained better robustness against multiple attacks. As for robustness, we utilized the feature points set to construct the Delaunay tessellation and embedded the watermark information in the histogram of each triangle. Because of the stability of Delaunay tessellation and the basic characteristics of affine transformation, the geometric robustness of the proposed scheme achieved a good effect as was verified in experiments.