关键词: 鲁棒性, 旋转、缩放、平移（RST）变换, 不变矩, 数字水印

Abstract: The existing digital watermarking is robust to add noise，filter and JPEG compression attacks，but resisting to RST geometric attacks is still a difficult challenge.It is a better method to embed the watermark into invariant regions of image.However，the embedding watermark and watermark detection are not synchronized because the image size is changed so it makes the watermark detection fail.In order to solve the problem that the size of image is changed between the embedding watermark and watermark detection，this paper proposes a novel method to resist RST transforms，which is based on model background image of zero pixels value and invariant moments.The experiment demonstrates the proposed method is better robust to add noise，filter and JPEG compression attacks，also it is better robust to RST transforms，so the proposed method is a simple，useful and credible algorithm.

Key words: robust, Rotation, Scaling, Translation（RST） transforms, invariant moments, digital watermark