动态三维测量中图像同步高速投影与采集的原理及实现
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摘要
基于结构光的动态物体三维面形测量对航空航天、能源和汽车等领域的科学研究与工程应用具有重要作用。然而现有测量设备单次测量时间过长,难以实现对动态物体三维面形的测量,其中主要的难点在于图像高速同步投影与采集。提出了一种图像精确同步高速投影与采集的方法,该方法通过实验测定出数字微镜翻转延时和触发曝光延时,设计了帧触发信号、数字微镜翻转、LED光源点亮和相机曝光之间耦合工作的精确时序,从而实现了220帧/秒图像的精确投影与采集,为动态物体三维面形测量设备的开发提供了良好的技术基础。
The dynamic 3D measurement base on structured light measurement technology become more and more important in field of industrial aerospace,energy,and automotive.However,the existing device cost a long time for single measurement,so it's hard to realize the dynamic measurement,the main difficulty lies to the synchronization between the projection image and acquisition in a high speed.Propose a method for the exactly synchronization between the projection image and acquisition,determine the digital micromirror flip time and trigger the exposure time through the experiment,and design precise timing relationships among the frame trigger signal,digital micromirror flip,LED light source and the camera exposure,so as to realize the 220 fps projection and acquisition image synchronously,this method provides a good technical basis for the dynamic 3D measurement device development.
The dynamic 3D measurement base on structured light measurement technology become more and more important in field of industrial aerospace,energy,and automotive.However,the existing device cost a long time for single measurement,so it's hard to realize the dynamic measurement,the main difficulty lies to the synchronization between the projection image and acquisition in a high speed.Propose a method for the exactly synchronization between the projection image and acquisition,determine the digital micromirror flip time and trigger the exposure time through the experiment,and design precise timing relationships among the frame trigger signal,digital micromirror flip,LED light source and the camera exposure,so as to realize the 220 fps projection and acquisition image synchronously,this method provides a good technical basis for the dynamic 3D measurement device development.
引文
[1]钟凯.基于多视相移框架的动态物体三维面形测量技术与系统研究[D].武汉:华中科技大学,2013.
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[2]Takeda M Mutoh K.Fourier transform profilometry for the automatic measurement of 3-D object shapes[J].Applied optics,1983,22(24):3977-3982.
[3]Zhou W,Su X.A direct mapping algorithm for phase-measuring profilometry[J].Journal of Modern Optics,1994,41(l):89-94.
[4]Pan J,Huang P,Chiang F.Color-coded binary fringe projection technique for 3-D shape measurement[J].Optical Engineering,2005(44).
[5]Srinivasan V,Liu H.Halioua M.Automated phase-measuring profilometry of 3-D diffuse objects[J].Applied optics,1984,23(18):3105-3108.
[6]Srinivasan V,Liu H.Halioua M.Automated phase-measuring profilometry:a phase mapping approach[J].Applied optics,1985,24(2):185-188.
[7]Zhong Kai,Li Zhongwei,Shi Yusheng,et al.Fast Phase Measurement Profilometry for Arbitrary Shape Objects without Phase Unwrapping[J].Optics&Lasers in Engineering,2013,51(11):1213-1222.
[8]Li Zhongwei,Shi Yusheng,Wang Congjun,et al.Accurate calibration method for a structured light system[J].Optical Engineering,2008,47(5).
[9]李中伟,王从军,史玉升.3D测量系统中的高精度摄像机标定算法[J].光电工程,2008,35(004):58-63.