| Non-Metric CCD Camera Calibration Algorithm in a Digital Photogrammetry System |
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| 作者姓名： | YANG Hua-chao DENG Ka-zhong ZHANG Shu-bi GUO Guang-li ZHOU Ming |
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| 作者单位： | School of Environment and Spatial lnformatics, China University of Mining ＆ Technology, Xuzhou , Jiangsu 221008, China |
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| 基金项目： | 中国矿业大学校科研和教改项目 |
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| 摘 要： | Camera calibration is a critical process in photogrammetry and a necessary step to acquire 3D information from a 2D image. In this paper, a flexible approach for CCD camera calibration using 2D direct linear transformation （DLT） and bundle adjustment is proposed. The proposed approach assumes that the camera interior orientation elements are known, and addresses a new closed form solution in planar object space based on homogenous coordinate representation and matrix factorization. Homogeneous coordinate representation offers a direct matrix correspondence between the parameters of the 2D DLT and the collinearity equation. The matrix factorization starts by recovering the elements of the rotation matrix and then solving for the camera position with the collinearity equation. Camera calibration with high precision is addressed by bundle adjustment using the initial values of the camera orientation elements. The results show that the calibration precision of principal point and focal length is about 0.2 and 0.3 pixels respectivelv, which can meet the requirements of close-range photogrammetry with high accuracy.
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| 关 键 词： | 电荷耦合器件 霍夫变换 摄影测量 共线性方程 束调节 摄像机标定 |
| 收稿时间： | 2005-11-15 |
| 修稿时间： | 2005-12-20 |
Non-Metric CCD Camera Calibration Algorithm in a Digital Photogrammetry System |
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| YANG Hua-chao DENG Ka-zhong ZHANG Shu-bi GUO Guang-li ZHOU Ming.Non-Metric CCD Camera Calibration Algorithm in a Digital Photogrammetry System[J].Journal of China University of Mining and Technology,2006,16(2):119-122. |
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| Authors: | YANG Hua-chao DENG Ka-zhong ZHANG Shu-bi GUO Guang-li ZHOU Ming |
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| Abstract: | Camera calibration is a critical process in photogrammetry and a necessary step to acquire 3D information from a 2D image. In this paper, a flexible approach for CCD camera calibration using 2D direct linear transformation (DLT) and bundle adjustment is proposed. The proposed approach assumes that the camera interior orientation elements are known, and addresses a new closed form solution in planar object space based on homogenous coordinate represen- tation and matrix factorization. Homogeneous coordinate representation offers a direct matrix correspondence between the parameters of the 2D DLT and the collinearity equation. The matrix factorization starts by recovering the elements of the rotation matrix and then solving for the camera position with the collinearity equation. Camera calibration with high precision is addressed by bundle adjustment using the initial values of the camera orientation elements. The results show that the calibration precision of principal point and focal length is about 0.2 and 0.3 pixels respec- tively, which can meet the requirements of close-range photogrammetry with high accuracy. |
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| Keywords: | direct linear transformation collinearity equation bundle adjustment camera calibration Hough transformation |
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