Research And Application Of Hand-held 3D Laser Scanning Technology Based On Parallel Multi-line

3D optical measuring technology is booming.The 3D structured light measurement technology based on laser is widely applied to various fields,such as aerospace,reverse engineering and restoration of cultural relics.A study on the hand-held 3D laser scanning technology based on parallel multi-line is made in the paper.The main technologies of the measurement system includes the building of the measurement system model,binocular matching of the centre of the lasers,3D splicing technology based on the noncoding points and etc.The main contents of this paper are as follows:(1)A new model based on 3D hand-held laser scanning technology is put forward.The model combines the binocular stereo vision system and the structured light system based on laser.The binocular stereo vision system is used in the 3D reconstruction of the noncoding points and the binocular matching oriented to the parallel multi-line laser.The structured light system based on laser is used in the 3D reconstruction of the parallel multi-line laser.We also describe the calibration of the binocular stereo system and the calibration of the structured light system model in detail.The process and results of the calibration are stated by experiment in this paper.(2)A binocular matching method oriented to the parallel multi-line laser is proposed.Epipolar constraint and the system internal relations is used to quickly and accurately reconstruct the parallel multi-line laser,which has high robustness.(3)A stable binocular matching method based on noncoding points is presented,combined with the epipolar constraint and RANSAC filtering algorithm to find the correct matching points.It significantly improves the accuracy of traditional matching methods.(4)A 3D splicing method based on distance feature is designed and utilized.This method set an exclusive label for each noncoding point with the noncoding point distance information in the space.These labels are unique.These labels can be used to match the space noncoding points under different perspectives.This method improves the accuracy of 3D splice,which also solves some matching ambiguity problems of traditional matching methods.(5)The system installation is built and experiments for standard parts and metal parts is made.Accuracy and speed of the system installation is verified through these experiments.