Anti-Geometrical Attacks Image Watermarking Scheme Based on Template Watermark

This paper proposes a novel anti-geometrical attacks digital image watermarking scheme. In the scheme, a kind of template watermark is proposed, and we embed template watermark as well as robust watermark into images. The template watermark is designed to detect the geometrical transformation, and the robust watermark is used for labeling the copyright. Given a disputed digital image, we first implement the template watermark detecting to determine the geometrical transformation the image went through, and then extract the robust watermark. To improve the detecting precision, regional watermarking algorithm is also proposed. The experiments demonstrate that the proposed scheme can well resist such geometrical attacks as rotation, scaling, cropping, as well as the JPEG compression.