摘要: 提出一种基于数字水印技术的印刷品防伪算法. 在图像打印前, 水印经Arnold置乱后嵌入到原始载体图像的Hadamard变换域中; 在检测数字水印时, 首先对印刷品扫描图像进行几何矫正, 利用边缘检测、Radon变换等方法检测图像旋转角度, 将其转正, 用三次内插法对图像重采样, 恢复图像的原始尺寸. 最后从矫正后的图像中提取水印. 实验结果表明, 这种算法具有较好的安全性、鲁棒性, 在防伪效果上取得了满意的结果.Abstract: The paper p roposed a forgery detection method in p rinted materials based on digital water2mark. First, the watermark was scrambled by Arnold transform and embedded into the Hadamard do2main of the image. When extracting watermark, the scan image was firstly rotated to the correct posi2tion, which rotate angle was detected by edge detecting and Radon transform. The image was secondlyrestored to the size of original image by the cubic convolution resamp le method and transformed toHadamard domain for extracting the watermark. After re - scrambling the extracted watermark, theembedded watermark was detected. The results show that the algorithm is security, robust, and effec2tive on the forgery detection in p rinted materials during the p rinting and scanning p rocess.
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机译：摘要: 提出一种基于数字水印技术的印刷品防伪算法. 在图像打印前, 水印经Arnold置乱后嵌入到原始载体图像的Hadamard变换域中; 在检测数字水印时, 首先对印刷品扫描图像进行几何矫正, 利用边缘检测、Radon变换等方法检测图像旋转角度, 将其转正, 用三次内插法对图像重采样, 恢复图像的原始尺寸. 最后从矫正后的图像中提取水印. 实验结果表明, 这种算法具有较好的安全性、鲁棒性, 在防伪效果上取得了满意的结果.Abstract: The paper p roposed a forgery detection method in p rinted materials based on digital water2mark. First, the watermark was scrambled by Arnold transform and embedded into the Hadamard do2main of the image. When extracting watermark, the scan image was firstly rotated to the correct posi2tion, which rotate angle was detected by edge detecting and Radon transform. The image was secondlyrestored to the size of original image by the cubic convolution resamp le method and transformed toHadamard domain for extracting the watermark. After re - scrambling the extracted watermark, theembedded watermark was detected. The results show that the algorithm is security, robust, and effec2tive on the forgery detection in p rinted materials during the p rinting and scanning p rocess.
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