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Wang W.-B.,Southwest University of Science and Technology | Liu G.-H.,Southwest University of Science and Technology | Liu X.-Y.,Southwest University of Science and Technology | Liu X.-Y.,Saint Buffalo Technologies Ltd Company | Qiu Z.-Q.,Saint Buffalo Technologies Ltd Company
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2010

The five-point algorithm of essential matrix is a common way to achieve relative orientation of the two-view images in 3D measuring. Polynomial solving techniques, which lead to polysemia while computing, are always adopted during the computing process. In order to determine the right solution, two improved methods for five-point algorithm are proposed to avoid multi-solutions. First of all, the inconsistent solutions of physical model were excluded with cheirality constraint. Secondly, the rest error solutions can be solved by computing sums of Sampson distance of all the common points or re-projection residual. In the two-view images, the minimum value among sums is just the correct orientation parameter values. Both simulation and real images experiments have proved the feasibility and correctness of the two tactics. In most cases, methods based on Sampson are much quicker than that based on re-projection. Source


Hu J.-C.,South University of Science and Technology of China | Liu X.-Y.,South University of Science and Technology of China | Liu X.-Y.,Saint Buffalo Technologies Ltd Company | Qiu Z.-Q.,Saint Buffalo Technologies Ltd Company
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2011

A camera self-calibration technique based on factorization and bundle adjustment is proposed. With the hand-held and fix-focus camera undergoing at least three arbitrary motions around the calibration pattern, all the intrinsic parameters and the distortion coefficients can be obtained. The proposed method has three novelties. Firstly, its robustness is markedly increased since all the images are aligned in the factorization process. Secondly, the non-linear optimization algorithm bundle adjustment guarantees high accuracy. Thirdly, the proposed method does not require specialized calibration pattern or rigid camera motion, which makes it be used in a wide range of applications. Both simulation and real images experiments proved the feasibility and applicability of the proposed method, particularly applying to those close-range photogrammetry system based on image sequences. As a result, the new algorithm has been successfully applied to the feature point measurement system TN 3DOMS.FP v1.2 with independent intellectual property right of Saint Buffalo Technology Co., Ltd. Source

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