基于共线原理的全景影像真彩色点云生成算法

摘要

Laser point cloud contains only intensity information and it is necessary for visual interpretation to obtain color information from other sensor .Cameras can provide texture ,color ,and other information of the corresponding object .Points with color information of corresponding pixels in digital images can be used to generate color point-cloud and conducive to the visualization ,classification and modeling of point-cloud .Different types of digital cameras are used in different Mobile Measurement Systems(MMS) , the principles and processes for generating color point-cloud in different systems are not the same . A method is proposed to generate the color point-cloud with panoramic image and laser point-cloud .The fusion of panoramic image and laser point-cloud are based on the collinear principle of three points .The experimental results show the proposed algorithm and formula are correct .%常规激光点云数据通过将激光点云与彩色影像进行融合，将影像所富含的色彩信息赋给相应的激光点云、可形成一种“纹理丰富、颜色直观、位置准确”的真彩色点云成果，不同类型相机拍摄得到的影像对激光点云赋彩色的原理和过程均不相同。文中基于移动测量系统及360°全景影像的测绘高新技术，研究全景相机拍摄的影像与激光点云的匹配、融合，提出一种基于共线原理的由全景影像给激光点云赋彩色的算法。算法充分利用全景影像360°可视以及激光点云位置精确的特点，经实验验证算法推导正确，生成的真彩色点云色彩纹理细致，空间位置准确。