Telecentric Lens Calibration And 3D Imaging System Based On Beam Adjustment

Three-dimensional digital imaging and measurement technology is widely used in precision manufacturing,medical engineering,video games,three-dimensional printing and other fields.Especially using to measure the surface of the object which is complicated,this techology using in two area which small object and huge object,the three-dimensional digital imaging measurement methods facing new challenges.In this thesis,the three-dimensional measurement technology of small-size objects is studied.On the one hand,the imaging model and calibration method of telecentric lens are involved.On the other hand,the three-dimensional imaging method and system Construct.The detailed study is as follows:(1)telecentric lens and its calibration method analysis and research.The imaging model of the telecentric lens and the existing calibration theory are described.It is proposed to introduce the bundle adjustment theory into the telecentric lens calibration.By combining the internal and external parameters with the target center,the calibration accuracy of the telecentric lens is improved and high precision target is made.The algorithm is proved by Matlab,and the experiment proves the effectiveness of the method.(2)Based on the telecentric lens,a monolithic microcoding three-dimensional imaging experiment platform was established.The projector in the monocular system can be regarded as an inverse camera,and the target point is obtained by the phase coding of the orthogonal stripe.The calibration of the projector is realized by the telecentric lens calibration algorithm with bundle adjustment.Combined with a single camera calibration,to achieve the entire monocular system calibration.The three-dimensional information of the micro-measured object was successfully obtained by using the phase-coded three-dimensional imaging technique.