Region Selection Techniques for Digital Image Watermarking
The effectiveness of a digital watermarking algorithm is indicated by the robustness of embedded watermarks against various attacks. Attacks which attempt to destroy watermarks have two types, noise-like signal processing and geometric distortions. To select a non-overlapping region, some reference parameters have been used, the regions with higher feature corner response are selected when the Harris - Laplacian or Harris - affine detector is used. The number of neighboring feature points inside a region is a major reference for obtaining a non-overlapping set in the watermarking method based on Mexican Hat wavelet scale interaction.