一种抗旋转、尺度和平移处理的图像水印算法  

Novel image watermarking algorithm robust against rotation, scaling and translation

作　　者：姚俊[1] 郭雷[1] 任建峰[1] 

机构地区：[1]西北工业大学自动化学院,陕西西安710072

出　　处：《计算机应用》2004年第12期19-21,27,共4页journal of Computer Applications

摘　　要：提出一种新的,能够抵抗旋转、尺度和平移处理的图像水印算法:直接在图像空间域中嵌入具有周期性和对称性的水印信号,其自相关函数中峰值点构成的峰值点阵图可作为几何处理参数估计的模板。使用霍夫变换从统计意义上对峰值点阵图中的噪声峰值点进行抑制,进而准确提取出峰值点阵图中具有最强方向的主轴方向用以估计旋转角度,并由与主轴方向平行的相邻直线间的距离估计尺度变换因子。实验结果表明:该算法对普通信号处理具有非常强的鲁棒性,且能够有效地抵抗小角度旋转、翻转、尺度和平移等几何处理。A novel image watermarking algorithms robust against rotation, scaling and translation was proposed. The periodical and symmetric watermark embedded directly in the spatial domain of the image, could be used as the template for estimation of the geometric transform parameters because the peaks in the Auto-correlation Function (ACF) had regular lattice structure. The rotation angle could be estimated accurately from the main axes direction estimated by Hough Transform (HT) because the noise peaks could be suppressed statistically at the same time. The scaling factors could be estimated from the distance between the two neighboring lines parallel to the main axes in the peaks lattice. Experiments demonstrate that the proposed algorithm is very robust against the common signal processing and can resist the small rotation, scaling flipping, cropping and translation.

关 键 词：数字水印 周期水印 自相关函数 霍夫变换 旋转 尺度和平移处理 

分 类 号：TP317.4[自动化与计算机技术—计算机软件与理论]