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It is vital to the calibration of vision systems to determine the coordinates of sample pairs of object points in 3D spare and their corresponding points in image plane. In order to improve the locating accuracy of the sample points, it is a common practice to utilize chessboard pattern, and use the intersection points as the sample points. As for the 3D vision system based on plane structure-light the sample points are required to be in the structure-light plane. So the above method cpu not be used. To solve...

It is vital to the calibration of vision systems to determine the coordinates of sample pairs of object points in 3D spare and their corresponding points in image plane. In order to improve the locating accuracy of the sample points, it is a common practice to utilize chessboard pattern, and use the intersection points as the sample points. As for the 3D vision system based on plane structure-light the sample points are required to be in the structure-light plane. So the above method cpu not be used. To solve this problem, we present a new calibration method whose theoretical basis is the cross-ratio invariance, and the method uses a specially designed calibration etalon block. Using this method, it is simple to determine the location of the sample points explicitly, based on these location data, we can finish the calibration of the vision system. The paper gives the experimental results and the calibration accuracy, and also presents the measures to improve the accuracy.

视觉系统的标定中,确定三维空间点与图象上对应点所组成的样本点对的坐标是问题的关键,为提高样本点的定位精度,通常采用棋盘格形状的图案,取其中的交点作为样本点.但在应用平面结构光的三维视觉系统中,样本点又必须在结构光平面中,无法应用上述方法,使得样本点的定位很困难,为了解决这一问题,我们提出了一种新的标定方法,该方法利用交比不变性原理,借助一块特殊设计的标定块,可以方便准确地确定样本点的位置.在此基础上完成了三维视觉系统的标定,文章给出了实验结果和标定精度,以及进一步提高精度的措施.

This paper introduces the study on omni- directional vision system calibration method using central catadioptric projection property of space line. The catadioptric image point of space line was captured applied ray- tracing algorithm. A conic fitting algo- rithm based on least- square theory was raised which be used in catadioptric image fitting of line. System imaging parameter was de- termined by cholsky decomposition and omni- directional vision system was calibration. The calibration experiment on real...

This paper introduces the study on omni- directional vision system calibration method using central catadioptric projection property of space line. The catadioptric image point of space line was captured applied ray- tracing algorithm. A conic fitting algo- rithm based on least- square theory was raised which be used in catadioptric image fitting of line. System imaging parameter was de- termined by cholsky decomposition and omni- directional vision system was calibration. The calibration experiment on real omni- di- rectional vision system verifies its effect.

利用空间直线的中心折反射投影的特性对全维视觉系统的标定方法进行了研究。应用光线追迹法提取空间直线折反射图像上的点,并提出一种基于最小二乘理论的二次曲线拟合方法,将其应用到直线折反射图像的拟合中,最终求出系统成像参数,完成对全维视觉系统的标定。对真实全维视觉系统的标定实验验证了该方法的实用性。

 
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