关键词: 数字水印, 几何攻击, 特征点, 图像归一化

Abstract: In this paper a digital watermarking scheme is proposed based on a combination of Harris feather point and image normalization.The scheme of feather point detector based on Harris is simple and reliable，the feather points remain holding after geometry attack.The normalized image of an image is nearly invariant with respect to rotations.As a result，the authors apply image normalization to these non-overlapped circles which centered at the feature points，after that，the authors can determine area for watermark embedding.Then the authors embed watermarks in the original circles.In this way，the synchronization issue for watermark embedding and detecting can be best solved.Simulation results show that this method can resist variety of geometry attack，such as rotation，scaling，shearing and other common signal attacks.

Key words: digital watermarking, geometrical attack, feather point, image normalization