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《Journal of Southeast University(Natural Science Edition)》 2006-05
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Close-range photogrammetric system based on reference points

Zhang Weizhong~(1,2) Zhang Liyan~2 Pan Zhenkuan~1 Wang Xiaoping~2 Zhou Ling~2(~1College of Information Engineering,Qingdao University,Qingdao 266071,China)(~2 Research Center of CAD/CAM Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)  
A robust photogrammetric system for 3D reconstruction based on reference points is described.This method uses non-coded and coded points.To minimize the possibility of mismatch of non-coded points between different images, a new coded points based matching approach is proposed for the non-coded points matching.The non-coded points matching between different images start from the coded points and mismatch is eliminated by using rules of similarity,ambiguity and distance constraint error.The correct matching ratio is very high.A new weighted iterative eigen algorithm based on coded points was adopted.The projection matrix of camera is recovered by using the coded points so as to determine the external pose parameters of camera.The 3D coordinates are recovered with the non-coded points.Compared to previous methods,this algorithm does not involve the problem of computing projection matrix of camera with all the points and its computing speed is faster.3D reconstruction precision is remarkably increased since the method of subpixel reference point center location is utilized.The experiments show that system is robust and precise in 3D reconstruction.
【Fund】: 国家自然科学基金资助项目(50475041)
【CateGory Index】: TP274
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