Abstract: A new digital watermarking method resistant to geometric attacks is proposed, in which the feature points are extracted by an affine-invariant point detector, and then watermarks are embedded into the affine invariant regions centered at these feature points. For further procedure, a novel FIS (Fuzzy Inference System) is employed to adaptively adjust the embedding strength in those regions. The validity of the method is confirmed by a number of experiments. Simulation results confirm the robustness of our proposed method to different attacks, such as common image processing, rotation, scaling, cropping, and several other affine transformations.

Key words: digital watermarking, geometric attack, affine-invariant region, fuzzy inference