【摘要】 提出了Radon域特征嵌入的虹膜图像数字水印算法.算法提取小波变换的过零表达系数,用于描述虹膜纹理特征,将其编码后作为水印信息嵌入原始虹膜图像.证明了虹膜图像Radon变换的幅频域是一个旋转、平移和缩放的不变域,水印的嵌入选择在这个不变域内进行.水印的检测过程不需要原始图像,是一种盲检测水印算法.实验结果表明,提出的虹膜水印算法对虹膜纹理具有敏感性,可以有效地保护虹膜图像纹理区域不受篡改.同时实验还表明,水印对一般的图像处理和几何失真攻击具有鲁棒性.更多还原

【Abstract】 A watermarking scheme for iris images based on features embedding in Radon domain was presented.Zero-crossings of wavelet transform are extracted as iris features,and coefficients of zero-crossings are coded as watermark to be embeded into the original iris images.It is proved that the magnitude-frequency domain of Radon transform are an invariant domain against geometric transform,where watermarking is preformed.The proposed watermarking method is a blind watermarking algorithm which means that original image is not needed in watermark detection.Experiments show that the method is fragile against tampering.They also show that it is robust against common image processing and geometric attacks.更多还原