抗投影变换的矢量地理数据水印算法

发布时间：2018-06-03 17:18

本文选题：水印算法 + 投影变换　；参考：《地球信息科学学报》2016年08期

【摘要】：在矢量地理数据水印算法研究中,以往研究较多考虑增删点、裁剪、平移、旋转等攻击方式,而对抗投影变换的攻击方式研究较少。由于投影变换在GIS中具有重要意义,故本文提出了一种抗投影变换的矢量地理数据水印算法。水印嵌入前,对待嵌矢量地理数据利用道格拉斯算法进行压缩,使用四叉树分块选取特征点,提取并保存特征点及其属性信息;水印嵌入采用坐标映射和量化机制以增强水印算法的鲁棒性;检测水印时,将待检测数据与原始特征点进行属性信息匹配,匹配成功的同名点采用二元三次多项式进行最小二乘法拟合,根据拟合的多项式系数对待检测数据进行投影变换,最终实现水印信息的提取。实验结果表明,本方法能抵抗投影变换攻击、增删点、几何变换以及它们的复合攻击,具有较好的可行性和实用性。
[Abstract]:In the research of vector geographic data watermarking algorithm, the previous research more consider the attack methods such as adding and deleting points, clipping, translation, rotation and so on, but there is less research on the attack way of counterprojection transformation. Because of the importance of projection transformation in GIS, this paper proposes a vector geographic data watermarking algorithm with anti-projection transformation. Before the watermark is embedded, the embedded vector geographic data is compressed by Douglas algorithm, and the feature points are selected by quadtree block, and the feature points and their attribute information are extracted and saved. The watermark embedding adopts coordinate mapping and quantization mechanism to enhance the robustness of the watermarking algorithm, and when the watermark is detected, the data to be detected is matched with the original feature information. The matching points of the same name are fitted by the least square method using the binary cubic polynomial, and the detection data are projected and transformed according to the polynomial coefficients of the fitting. Finally, the watermark information is extracted. The experimental results show that this method can resist projective transformation attack, add and delete point, geometric transformation and their compound attack, and it has good feasibility and practicability.
【作者单位】：南京师范大学虚拟地理环境教育部重点实验室;江苏省地理信息资源开发与利用协同创新中心;
【基金】：国家社科基金重大项目(11&ZD162) 国家自然科学基金项目(41301413) 江苏省自然科学基金项目(BK20130903) 公益性行业科研专项(201512021;201512019)
【分类号】：TP309.7;P208

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