An Optimal Detector Structure for the Fourier Descriptors Domain Watermarking of 2D Vector Graphics
An Optimal Detector Structure for the Fourier Descriptors Domain Watermarking of 2D Vector Graphics
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DOI：
10.1109/tvcg.2007.1050
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发表时间：
2007-09
影响因子：
5.2
通讯作者：
V. Rodríguez-Doncel;N. Nikolaidis;I. Pitas
中科院分区：
文献类型：
--
作者：
V. Rodríguez-Doncel;N. Nikolaidis;I. Pitas
多边形线构成了二维矢量图形数据的关键图形原语。因此，对这样一个实体应用数字水印的能力将使矢量图形格式的卡通、绘图和地理信息系统（GIS）数据的水印成为可能。本文在现有的多边形线水印算法的基础上进行了扩展，该算法通过对傅里叶描述子的幅度进行不可察觉的修改来实现多边形线水印。通过该技术嵌入的水印可以在旋转、平移、缩放或反射的多边形线中检测到。这种水印的检测以前是通过相关检测器进行的。本文利用傅里叶描述子的统计特性来设计一种最优盲检测器。此外，还解决了多线水印问题以及其他实现问题。实验结果验证了该方法的隐蔽性和鲁棒性。
Polygonal lines constitute a key graphical primitive in 2D vector graphics data. Thus, the ability to apply a digital watermark to such an entity would enable the watermarking of cartoons, drawings, and geographical information systems (GIS) data in vector graphics format. This paper builds on and extends an existing algorithm that achieves polygonal line watermarking by modifying the Fourier descriptors magnitude in an imperceptible way. Watermarks embedded by this technique can be detected in rotated, translated, scaled, or reflected polygonal lines. The detection of such watermarks had been previously carried out through a correlator detector. In this paper, analysis of the statistics of the Fourier descriptors is exploited to devise an optimal blind detector. Furthermore, the problem of watermarking multiple lines, as well as other implementation issues are being addressed. Experimental results verify the imperceptibility and robustness of the proposed method.