三维点云数据数字水印算法研究

发布时间：2018-08-09 15:29

【摘要】：数字水印技术融合信息安全、数据保密、信息隐写等关键技术,将用于识别的秘密信息嵌入到受保护对象中,进而实现版权声明、数据跟踪和使用授权的合法化。数字水印技术的发展为保障地理空间信息数据的安全提供了有效的解决方案,该项技术已经研究应用于二维矢量地图、遥感影像数据、地图数据切片、数字高程模型、三维网格模型等多个方面。近年,随着激光扫描技术的快速发展及在测绘地理信息领域的深入应用,激光扫描数据已经成为工程测量、文物保护、三维建模等领域的重要数据源,数据的保护需求也随之增强。因此,三维点云数据的数字水印算法研究具有一定的理论价值和应用前景。本文研究以三维点云数据的自身特征及其水印的基本技术特征为出发点,研究了三维点云数据数字水印算法,主要研究内容如下： (1)结合地理空间数据特征,从数据量、数据格式、信息内容、数学基础等多个角度分析了三维点云数据特征,概括了三维点云数据的数字水印的基本技术特征,为数字水印技术应用于三维点云数据的保护奠定基础。 (2)提出了一种顾及数据精度的三维点云数据数字水印算法,算法以数据重心到采样点的距离作为水印信息的嵌入载体,采用加法法则嵌入水印信息,在嵌入过程中实时检测数据精度。实验证明,该算法具有较强的鲁棒性,较好的保证了数据精度,属于非盲水印算法。 (3)提出了水印信息嵌入强度自适应的三维点云数据数字水印算法,解决了上一算法数据精度调整后对水印提取准确性扰动的问题,实现了数据精度和嵌入强度两者的平衡。实验证明,该算法具有较强的鲁棒性,对数据精度影响较小。 (4)提出了基于建筑物点云数据面片分割边缘线的数字水印算法,算法从建筑物三维点云面状特征出发,以面片边缘线中点到空间直线的距离序列作为嵌入载体,采用奇偶二值化实现水印信息的嵌入。实验证明,该算法具有较强的鲁棒性,属于盲水印算法。 (5)基于本文研究的算法,结合具体数据格式设计建立了三维点云数据数字水印原型系统。
[Abstract]:Digital watermarking technology integrates the key technologies such as information security, data confidentiality, information steganography and so on. It embed the secret information used for identification into protected objects, and then realized the legalization of copyright declaration, data tracking and authorization. The development of digital watermarking technology provides an effective solution to ensure the security of geospatial information data. The technology has been applied to two-dimensional vector map, remote sensing image data, map data slice, digital elevation model. Three-dimensional mesh model and other aspects. In recent years, with the rapid development of laser scanning technology and the deep application in the field of surveying and mapping geographic information, laser scanning data has become an important data source in the fields of engineering survey, heritage conservation, 3D modeling, etc. The need for data protection also increases. Therefore, the research of digital watermarking algorithm for 3D point cloud data has certain theoretical value and application prospect. Based on the characteristics of 3D point cloud data and the basic technical features of watermarking, this paper studies the digital watermarking algorithm of 3D point cloud data. The main research contents are as follows: (1) combining with the feature of geospatial data, The features of 3D point cloud data are analyzed from the aspects of data volume, data format, information content, mathematical basis and so on, and the basic technical features of digital watermarking of 3D point cloud data are summarized. It lays a foundation for the application of digital watermarking technology to the protection of 3D point cloud data. (2) A digital watermarking algorithm for 3D point cloud data is proposed, which takes into account the accuracy of the data. The algorithm takes the distance from the center of gravity to the sampling point as the embedding carrier of the watermark information, and adopts the addition law to embed the watermark information, which can detect the data precision in real time during the embedding process. Experiments show that the algorithm is robust and can guarantee the accuracy of the data. (3) A digital watermarking algorithm with adaptive embedding strength for 3D point cloud data is proposed. The problem of disturbing the accuracy of watermark extraction after adjusting the data precision of the previous algorithm is solved, and the balance between the data precision and the embedding intensity is achieved. Experimental results show that the algorithm is robust and has little effect on data accuracy. (4) A digital watermarking algorithm based on building point cloud data slice segmentation edge line is proposed. The distance sequence from the midpoint of the edge line to the spatial straight line is used as the embedding carrier, and the watermark information is embedded with parity binarization. Experiments show that the algorithm has strong robustness and belongs to blind watermarking algorithm. (5) based on the algorithm studied in this paper, a 3D point cloud digital watermarking prototype system is established based on the design of specific data format.
【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P208;TP309.7

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