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Research on Vision Measurement of the Thermal and Large-size Forging Based on Laser Scanning and Data Registration

Author: LiLiang
Tutor: ZhaoZhuanPing
School: Nanjing University of Aeronautics and Astronautics
Course: Mechanical and Electronic Engineering
Keywords: Stereo vision Laser scanning Data splicing Image processing Match reconstruction Hot large forgings
CLC: TP391.41
Type: Master's thesis
Year: 2009
Downloads: 90
Quote: 1
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Abstract


With the rapid development of modern industrial technology , has become increasingly important to the production of large forgings . Large forgings size is an important indicator of the importance of timely detection forgings production . A long time , in the forging process using artificial visual method of measuring the dimensions of the high temperature forging , caused by the forging dimensions generally more than a predetermined value a larger margin (forging average loss of 15%) . The purpose of this research is the use of binocular stereo vision technology , to build hot large forgings non-contact vision measurement system , to change the the large forgings harsh production environment , measurement technology is backward , and the status of large measurement error . Hot characteristics of the surface of the object to be measured , the green the word line laser scan to solve the problem of corresponding points matching stereo vision data stitching ; axial size of the measured object , to solve the multi-station coordinate the issue of reunification of the multi-stage data . In the analysis of a variety of camera calibration method based on Zhang plane calibration method extended to the calibration of the stereo vision system from a single camera calibration in Matlab development environment to achieve higher precision calibration of this article visual measurement system . Digital filter technology to eliminate glare interference ; median filtering technology to eliminate the impact of random noise ; through segmented gray linear transformation , effectively improve the image quality ; distortion correction to eliminate the distortion error ; the end of the line features Canny edge detection method to extract the feature edge , cross-section beam fixed threshold , morphological erosion , refined processing methods used to extract the characteristic central skeleton ; adaptive threshold , recursive binary image connected domain extraction extracted by the method of splicing mark point ; lines correction technique , to eliminate the parallax of the left and right images in the vertical direction ; SVD decomposition method for measuring inter-site data splicing . On the basis of in-depth theoretical studies , build hot large forgings visual measurement system based on laser scanning and stitching , the preparation of the measurement software , and the cylinder hot forgings kind conducted two site measurement experiment .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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