倾斜摄影三维模型数字水印算法

doi:10.12082/dqxxkx.2018.180011

地球信息科学学报 ›› 2018, Vol. 20 ›› Issue (6): 738-743.doi: 10.12082/dqxxkx.2018.180011

• 2017年中国地理信息科学理论与方法学术年会优秀论文专辑 • 上一篇下一篇

倾斜摄影三维模型数字水印算法

王刚(), 任娜^*(), 朱长青, 景旻

1. 南京师范大学虚拟地理环境教育部重点实验室,南京 210023
2. 江苏省地理信息资源开发与利用协同创新中心,南京 210023

收稿日期:2018-01-02 修回日期:2018-03-24 出版日期:2018-06-20 发布日期:2018-06-20
通讯作者: 任娜 E-mail:wgnjnu@163.com;renna1026@163.com
作者简介:
作者简介：王刚(1993-),男,河北张家口人,硕士生,研究方向为地理数据安全。E-mail: wgnjnu@163.com
基金资助:
江苏省“六大人才高峰”创新人才团队项目(XYDXXJS-CXTD-004)

The Digital Watermarking Algorithm for 3D Models of Oblique Photography

WANG Gang(), REN Na^*(), ZHU Changqing, JING Min

1. Key Laboratory of Virtual Geographic Environment of Ministry of Education, Nanjing Normal University, Jiangsu Province, Nanjing 210023, China
2. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Jiangsu Province, Nanjing 210023, China

Received:2018-01-02 Revised:2018-03-24 Online:2018-06-20 Published:2018-06-20
Contact: REN Na E-mail:wgnjnu@163.com;renna1026@163.com
Supported by:
Jiangsu Province “Six Personnel Peaks” Innovative Talent Team Project, No.XYDXXJS-CXTD-004

摘要/Abstract

摘要：

倾斜摄影三维模型作为一种地理数据,其数据安全问题不容忽视,数字水印技术可以为其版权保护提供有效的解决方案。本文基于倾斜摄影三维模型数据特征,根据其垂直方向上的稳定性,提出了一种基于距离映射机制的三维点云数据盲水印算法。首先,提取倾斜摄影三维模型中的点云并对其按照高度值排序;其次,将点云间相邻点的高度差作为信息载体,利用映射思想建立水印信息与水印嵌入位置的对应;最后,通过修改坐标值的奇偶性完成水印信息的嵌入。检测水印时通过顶点提取、排序、水平距离与水印位的映射和统计相邻点水印嵌入位置的奇偶性实现水印信息的提取。实验表明,该算法具有良好的不可感知性,并对平移、裁剪和旋转等常见攻击具有较强的鲁棒性。

关键词: 数字水印, 倾斜摄影, 三维模型, 鲁棒性, 盲水印

Abstract:

The importance of data security cannot be ignored in 3D model data of oblique photography, which is an important kind of geographic data. Digital watermarking technique can provide powerful protection for oblique photography 3D models. In the past, among studies of 3D model watermarking algorithms, oblique photography 3D models were mentioned rarely and those algorithms cannot meet the demand for the data security of oblique photography 3D models. If a watermarking algorithm is designed in combination with the characteristics of oblique photography 3D model data, obviously, it will be applicable for corresponding 3D models. In this paper, a blind watermarking algorithm is designed based on the characteristic and vertical stability of oblique photography 3D model data. Before embedding watermark in data, some preprocessing steps must be completed. The 3D points will be extracted from oblique photography 3D model data, and sorted by z-coordinate from smallest to largest. Then, using height difference between neighboring points as the watermark information carrier, watermark information is embedded by modifying the parity of the height difference. In order to build a correspondence between embedding location and watermark information, the horizontal distance of neighboring points is used to complete mapping. In the process of watermark testing, points extracting and sorting should be finished firstly as in the process of embedding. Then information can be extracted by distinguishing the parity of the height difference. In this process, mapping is also used. In order to analyze the robustness of this algorithm quantitatively, some experiments were completed. The results show that the algorithm is robust against some usual attacks such as data cutting, translation and rotation.

Key words: digital watermarking, oblique photography, 3D model, robustness, blind watermarking

王刚, 任娜, 朱长青, 景旻. 倾斜摄影三维模型数字水印算法[J]. 地球信息科学学报, 2018, 20(6): 738-743.DOI:10.12082/dqxxkx.2018.180011

WANG Gang,REN Na,ZHU Changqing,JING Min. The Digital Watermarking Algorithm for 3D Models of Oblique Photography[J]. Journal of Geo-information Science, 2018, 20(6): 738-743.DOI:10.12082/dqxxkx.2018.180011

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评价指标	参数x的值	结果
Hausdorff	4	1.0×10^-8
SNR	4	127.7
PSNR	4	106.3

平移方向	平移距离/m	水印信息相关值
X轴	100	1
Y轴	100	1
Z轴	100	1

裁剪强度	水印信息相关值	水印图片
20%	0.98
40%	0.94
60%	0.82

沿Z轴旋转方向	旋转角度/°	水印信息相关值
顺时针	30	1
顺时针	60	1
逆时针	60	1

倾斜摄影三维模型数字水印算法

The Digital Watermarking Algorithm for 3D Models of Oblique Photography

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