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首页> 外文期刊>Optical engineering >Calibrating a camera focused on a long shot using a calibration plate and defocused corner points
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Calibrating a camera focused on a long shot using a calibration plate and defocused corner points

机译：使用校准板和散焦的角点校准聚焦于远景的相机

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摘要

When focusing on a long shot, it is very difficult to calibrate a camera with high precision. We propose a method of obtaining a close shot of the calibration plate, extracting corner points from the defocused image of the calibration plate, and constructing a three-dimensional control point to calibrate the camera. We construct a defocused corner template and extract the corner points from the defocused image of the calibration plate using the normalized cross-correlation algorithm. Experimental results show that, after the camera has been calibrated by this method, the average pixel distance accuracy of the re-projected detection point pixel at 40 m reaches 1.9 pixels. The average spatial distance accuracy of the corresponding three-dimensional point reaches 2.1 mm.
机译：当对焦于远距离拍摄时，很难高精度地校准相机。我们提出一种获取校准板近景，从校准板散焦图像中提取角点并构造三维控制点以校准相机的方法。我们构造一个散焦角模板，并使用归一化互相关算法从校准板的散焦图像中提取角点。实验结果表明，通过该方法对摄像机进行标定后，在40 m处重新投影的检测点像素的平均像素距离精度达到1.9像素。相应三维点的平均空间距离精度达到2.1 mm。

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