三維點云數(shù)據(jù)數(shù)字水印算法研究
發(fā)布時間：2018-08-09 15:29
【摘要】：數(shù)字水印技術(shù)融合信息安全、數(shù)據(jù)保密、信息隱寫等關(guān)鍵技術(shù),將用于識別的秘密信息嵌入到受保護對象中,進而實現(xiàn)版權(quán)聲明、數(shù)據(jù)跟蹤和使用授權(quán)的合法化。數(shù)字水印技術(shù)的發(fā)展為保障地理空間信息數(shù)據(jù)的安全提供了有效的解決方案,該項技術(shù)已經(jīng)研究應(yīng)用于二維矢量地圖、遙感影像數(shù)據(jù)、地圖數(shù)據(jù)切片、數(shù)字高程模型、三維網(wǎng)格模型等多個方面。近年,隨著激光掃描技術(shù)的快速發(fā)展及在測繪地理信息領(lǐng)域的深入應(yīng)用,激光掃描數(shù)據(jù)已經(jīng)成為工程測量、文物保護、三維建模等領(lǐng)域的重要數(shù)據(jù)源,數(shù)據(jù)的保護需求也隨之增強。因此,三維點云數(shù)據(jù)的數(shù)字水印算法研究具有一定的理論價值和應(yīng)用前景。 本文研究以三維點云數(shù)據(jù)的自身特征及其水印的基本技術(shù)特征為出發(fā)點,研究了三維點云數(shù)據(jù)數(shù)字水印算法,主要研究內(nèi)容如下： (1)結(jié)合地理空間數(shù)據(jù)特征,從數(shù)據(jù)量、數(shù)據(jù)格式、信息內(nèi)容、數(shù)學(xué)基礎(chǔ)等多個角度分析了三維點云數(shù)據(jù)特征,概括了三維點云數(shù)據(jù)的數(shù)字水印的基本技術(shù)特征,為數(shù)字水印技術(shù)應(yīng)用于三維點云數(shù)據(jù)的保護奠定基礎(chǔ)。 (2)提出了一種顧及數(shù)據(jù)精度的三維點云數(shù)據(jù)數(shù)字水印算法,算法以數(shù)據(jù)重心到采樣點的距離作為水印信息的嵌入載體,采用加法法則嵌入水印信息,在嵌入過程中實時檢測數(shù)據(jù)精度。實驗證明,該算法具有較強的魯棒性,較好的保證了數(shù)據(jù)精度,屬于非盲水印算法。 (3)提出了水印信息嵌入強度自適應(yīng)的三維點云數(shù)據(jù)數(shù)字水印算法,解決了上一算法數(shù)據(jù)精度調(diào)整后對水印提取準確性擾動的問題,實現(xiàn)了數(shù)據(jù)精度和嵌入強度兩者的平衡。實驗證明,該算法具有較強的魯棒性,對數(shù)據(jù)精度影響較小。 (4)提出了基于建筑物點云數(shù)據(jù)面片分割邊緣線的數(shù)字水印算法,算法從建筑物三維點云面狀特征出發(fā),以面片邊緣線中點到空間直線的距離序列作為嵌入載體,采用奇偶二值化實現(xiàn)水印信息的嵌入。實驗證明,該算法具有較強的魯棒性,屬于盲水印算法。 (5)基于本文研究的算法,結(jié)合具體數(shù)據(jù)格式設(shè)計建立了三維點云數(shù)據(jù)數(shù)字水印原型系統(tǒng)。
[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.
【學(xué)位授予單位】：南京師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：P208;TP309.7
本文編號：2174524
[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.
【學(xué)位授予單位】：南京師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：P208;TP309.7
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