| 基于射影不变量的摄像机自标定方法 |
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| 引用本文： | 张维勇,王征,翟鸣,李劲,刘可. 基于射影不变量的摄像机自标定方法[J]. 中国图象图形学报, 2005, 10(11): 1432-1435 |
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| 作者姓名： | 张维勇 王征 翟鸣 李劲 刘可 |
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| 作者单位： | 合肥工业大学计算机与信息学院 合肥230009(张维勇，王征，刘可)，上海交通大学电子信息与电气工程学院自动化系 上海200240(翟鸣)，安徽省气象局 合肥230031(李劲) |
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| 摘 要： | 为了方便而精确地进行摄像机标定,提出了一种基于射影不变量的求解摄像机内参数的方法,该方法利用交比在射影变换中不变的性质,通过同一平面中相交直线的无穷远点与虚圆点的交比,先求出同一模板的不同方位的3幅图像中的虚圆点的像;然后利用绝对二次曲线的像在摄像机做刚体运动时保持不变的性质,进而求出绝对二次曲线的像;最后对结果进行Cholesky分解,就可以得到摄像机的内参数。实验表明,该方法行之有效,可以达到较高的精度。
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| 关 键 词： | 摄像机自标定 射影变换 交比 虚圆点 |
| 文章编号： | 1006-8961（2005）11-1432-04 |
| 收稿时间： | 2005-08-19 |
| 修稿时间： | 2005-10-01 |
A Method of Camera Self-calibration Based on the Projective Invariant |
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| ZHANG Wei-yong~,ZHANG Wei-yong~,ZHANG Wei-yong~,ZHANG Wei-yong~ and ZHANG Wei-yong~. A Method of Camera Self-calibration Based on the Projective Invariant[J]. Journal of Image and Graphics, 2005, 10(11): 1432-1435 |
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| Authors: | ZHANG Wei-yong~ ZHANG Wei-yong~ ZHANG Wei-yong~ ZHANG Wei-yong~ ZHANG Wei-yong~ |
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| Affiliation: | ZHANG Wei-yong~ |
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| Abstract: | In this paper,a method of camera self-calibration based on the projective invariant is proposed.By the invariability of Cross Ratio in projective transform,we can compute the image of circular points via the cross ratio of circular points and vanish points of intersecting lines;With the image of circular points in three images of the planar pattern from different orientation,we can get IAC(Image of Absolute Conic),because of the invariability of IAC in rigid motion;Using Cholesky factorization on IAC,we get internal parameters of the camera.The result of experiments shows that this method is effective and has high precision. |
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| Keywords: | camera self-calibration projective transform cross ratio circular points |
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