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Therefore the authors can find the corresponding angular point coordinates. Then the authors have compared the semi-circular data of the slots ends and find the points whose tangent line\u2019s slop are biggest. These points are absolutely tin the leftmost and in the rightmost. Thus the authors have got the length and the width of the image in the coordinate system. Then the authors can get the camera\u2019s internal parameters and external parameters after the camera calibration. The practice shows that the system is feasible and it has high use value.<\/p>","DOI":"10.4018\/ijapuc.2013070104","type":"journal-article","created":{"date-parts":[[2014,1,28]],"date-time":"2014-01-28T12:43:34Z","timestamp":1390913014000},"page":"38-46","source":"Crossref","is-referenced-by-count":0,"title":["Research on Parts Measurement Method Based on Machine Vision"],"prefix":"10.4018","volume":"5","author":[{"given":"Jun","family":"Zhang","sequence":"first","affiliation":[{"name":"School of Electrical Engineering and Automation, Tianjin University, Tianjin, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuhua","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Electrical Engineering and Automation, Tianjin University, Tianjin, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhengling","family":"Yang","sequence":"additional","affiliation":[{"name":"School of Electrical Engineering and Automation, Tianjin University, Tianjin, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"2432","reference":[{"key":"ijapuc.2013070104-0","doi-asserted-by":"publisher","DOI":"10.1016\/j.patrec.2005.09.023"},{"key":"ijapuc.2013070104-1","doi-asserted-by":"publisher","DOI":"10.1016\/j.patcog.2005.05.014"},{"key":"ijapuc.2013070104-2","doi-asserted-by":"crossref","unstructured":"Dafu, P., & Bo, W. 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