依据点云强度校正的壁画纠正

方伟; 黄先锋; 张帆; 李德仁

doi:10.11947/j.AGCS.2015.20140244

测绘学报 >

2015 , Vol. 44 >Issue 5: 541 - 547

DOI: https://doi.org/10.11947/j.AGCS.2015.20140244

摄影测量学与遥感

依据点云强度校正的壁画纠正

方伟 ,
黄先锋 ,
张帆 ,
李德仁

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武汉大学测绘遥感信息工程国家重点实验室, 湖北武汉 430079

方伟(1985—),男,博士生,研究方向为摄影测量与遥感、三维激光扫描数据处理。E-mail: wei.fang@whu.edu.cn

收稿日期: 2014-05-14

修回日期: 2014-09-05

网络出版日期: 2015-05-27

基金资助

国家973计划(2011CB707001;2012CB725300);国家自然科学基金(41001308;41071291);国家科技支撑计划(2014BAK07B04);深圳市战略性新兴产业发展专项资助(JCYJ20120618163005494)

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Mural Image Rectification Based on Correction of Laser Point Cloud Intensity

FANG Wei ,
HUANG Xianfeng ,
ZHANG Fan ,
LI Deren

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State Key Laboratory of Information Engineering on Survey, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China

Received date: 2014-05-14

Revised date: 2014-09-05

Online published: 2015-05-27

Supported by

The National Basic Research Program of China(973 Program)(Nos.2011CB707001;2012CB725303);The National Natural Science Foundation of China(Nos.41001308;41071291);The National Key Technology Research and Development Program of the Ministry of Science and Technology of China(No.2014BAK07B04);Shenzhen Special Funding for the Development of Strategic Emerging Industries(No.JCYJ 20120618163005494)

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摘要

壁画纠正能消除数字壁画影像的变形并赋予其空间参数特性,是壁画数字化保护中的关键步骤之一。激光扫描数据作为壁画影像与三维空间的媒介,在壁画影像的纹理映射和纠正中具有重要的意义。然而,激光点云强度的近距离反常现象给壁画纠正中特征点的提取带来了困难。本文针对基于点云的壁画纠正中强度信息的近距离反常问题,研究了激光成像原理,推导了顾及激光接收系统散焦效应的强度函数,并采集样本数据进行模型参数估计,通过对估计模型和实际采集数据进行比较,生成不受距离和入射角影响的相对反射率,从而有效校正了强度异常的点云数据。试验表明,在壁画影像纠正过程中,该方法能有效解决强度影像提取特征点少且分布不均的问题,效果明显优于通用的数字图像处理方法。

关键词： 激光点云; 强度校正; 散焦效应; 壁画纠正

本文引用格式

方伟 , 黄先锋 , 张帆 , 李德仁 . 依据点云强度校正的壁画纠正[J]. 测绘学报, 2015 , 44(5) : 541 -547 . DOI: 10.11947/j.AGCS.2015.20140244

Abstract

Image rectification can reduce the distortion of digital mural image and attach rectified image with spatial properties, thus becomes one of key steps in mural image digital protection. As an intermediate data of 2D and 3D, intensity information of laser scanning is significant on texture mapping and rectification of mural images in grottos. However, the unusual phenomenon of laser intensity at near distance makes it very difficult on extracting feature points for image rectification needed. To eliminate the near distance effect on intensity-based mural rectification, the procedure of laser transmission was studied and the intensity function of defocusing effect of laser receiving optics was deduced. By dividing point cloud intensity values with corresponding values of functions with estimated parameters from collected sample data, range and incidence angle invariant relative reflectance was generated, thus unusual intensity of point cloud data was corrected effectively. Experiments demonstrate that this method can effectively solve the problem of feature points in respect of low density and uneven distribution, thus achieve better results than general digital image processing method.

Key words： laser scanning point cloud; intensity correction; defocusing effect; mural image rectification

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