摘要
提出一种基于哈尔正交函数系的抗裁剪鲁棒水印算法,该算法根据哈尔正交函数系的完备归一化正交性质,对图像进行分块哈尔正交变换,根据图像视觉系统特性和哈尔正交变换性质,提取重要的中频系数,并结合零水印嵌入技术,将水印自适应地嵌入哈尔正交变换的中频矩阵,从而提高了水印算法的有效性,对裁剪攻击具有很强的抗攻击性,实验表明:该算法具有良好的鲁棒性和有效性。
This paper introduced a robust digital watermarking method against shearing based on Haar orthogonal function system. The proposed method makes the piece - based orthogonal transform on the image. The significant middle frequency coefficient in the transformation matrix is extracted based on characteristics of the image visual system and the Haar orthogonal transform. The watermark is adaptively embedded into the middle frequency matrix. The method improves the validity of watermarking and shows excellent advantage against shearing attack. Experimental results show that the watermark approach based on Haar orthogonal function system can provide an excellent protection under various attacks.
出处
《信息技术》
2006年第6期40-44,共5页
Information Technology
关键词
数字水印
哈尔正交函数系
裁剪攻击
digital watermarking
Haar orthogonal function system
shearing attack
