结合结构光三维测量与近景摄影测量各自的优势,实现高精度高分辨率三维测量,成为大尺寸空间光学三维测量的有效手段.其测量过程需在待测物体上粘贴一定数目的标记点,而粘贴标记点会带来一系列的缺点和限制.本文提出舍弃粘贴标记点的步骤,从理论上分析了反向摄影大尺度空间结构光三维测量的可行性.在结构光三维测量系统上安装辅助的反向摄像机,在结构光系统进行大尺寸物体局部三维数据单次测量时,用辅助摄像机反向观测作为定向靶标的大型液晶显示器,根据反向摄像机对液晶定向靶标的多次成像约束,反向追踪结构光三维测量系统相对于定向靶标的位姿,在反向摄像机位姿传递的辅助下,将所有结构光系统单次测量的三维数据统一在定向靶标坐标系下,实现大尺寸空间高精度高分辨率三维测量目的.反向摄影结构光三维测量技术体现了信息反向传递的优势,可实现无接触大尺寸空间结构光的三维测量.
Combining the advantages of both Structured Light and Close Range photogrammetry is an effective method for large scale optical 3D measurement.A number of coded targets are required to be pasted on the measured objects,which produces a series of shortcomings and limitations.This paper proposes a structured light measurement based on inverse photography.An auxiliary inverse camera is installed on a structured light system.When the single local measurement is operated,the inverse camera observes a large LCD screen that is used as an oriented target.According to the multiple imaging constraints for inverse camera,local 3D data of multiple structured light measurements are unified in a global frame defined with the large LCD screen,to achieve the whole data of large scale 3D measurement.The proposed methods exhibit the advantage of information inverse transmission,and can reach the result of contact-less and large scale 3D measurement.
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