基于方向小波与Slant变换的鲁棒水印算法

摘要

设计了一种基于内容的数字水印算法.算法以方向小波变换提取的独立分块图像正则方向作为水印信息,根据图像噪声可见函数将水印信息量化嵌入分块图像Slant变换中频系数之中.实验结果显示,算法对于常见图像处理和几何攻击均具有很强的鲁棒性,与基于DCT和PST变换的算法相比,该算法能够更有效地抵抗一些恶意和非恶意操作同时实施的操作.%A content-based image watermarking algorithm is proposed. The watermarking is extracted by directional wavelet independently block-image. The watermarking is embedded into the middle frequency region of each block in the Slant transform domain by noise visibility function. Experimental results show that the proposed scheme is robust against the common signals processing and robust against usually geometric attacks, Furthermore, compared with the DCT and PST based schemes, the proposed method obtains better performance when malicious and non-malicious manipulations are applied together.