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Study on Rapid 3D Surface Measurement System Based on Laser Visual Inspection

Author: RenTongQun
Tutor: ZuoJiGui
School: Tianjin University
Course: Measuring Technology and Instruments
Keywords: Laser scanning Binocular stereo vision Laser Vision Topography Non-contact measurement
CLC: TH744.5
Type: Master's thesis
Year: 2005
Downloads: 334
Quote: 2
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Abstract


In this paper, the three - dimensional shape measurement based on the principle of stereo vision and laser scanning technology to analyze the existing three-dimensional shape measurement methods and means proposed binocular stereo vision based on laser scanning technology three - dimensional shape measurement technology . Effective to overcome the conventional method structure cumbersome , encoding difficulty , complex data processing shortcomings . This system uses the the space orderly arrangement of five groups semiconductor laser to produce the approximate spacing of scanning light bar ; the scan structure design combined with precision stepping motor and harmonic deceleration institutions ; binocular stereo vision measuring principle and the accuracy of the analysis optimize the design of a three - dimensional probe ; through the CCD calibration , accurate extraction and outside of the three-dimensional surface scanning , image preprocessing, feature point extremely constrained matching technology to complete the physical three-dimensional shape measurement . The system structure is simple, easy to carry , and get more data , you can achieve on-site non-contact three - dimensional morphology , high accuracy and fast measurement, to meet the requirements of modern measurement . The main content in the paper are as follows : 1 . Analysis binocular stereo vision principle and the mathematical model of the probe ; binocular vision probe the structure of the measurement accuracy . 2 . Developed a new binocular vision probe based on laser scanning technology : including precision stepper motor and harmonic deceleration mechanism based the scanning structure and the control module of the probe , the probe and computer communications . No hardware changes, simply by changing the software to facilitate the adjustment of the optical scan resolution and frequency . Designed for the characteristics of the laser scanning image processing software , the median filtering , automated threshold morphological techniques for processing the scanned image , based on the characteristics of the edge detection point crude fine extraction and epipolar constraint programs . Completed prototype production and commissioning of the system , and the actual measurements to obtain a three-dimensional morphology of the different measuring angles measured object data .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Optical instruments > Physical optical instruments > Laser equipment
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