线激光辅助单目视觉测量铁路侵限异物尺寸

发布时间：2018-02-14 05:26

本文关键词： 异物入侵单目视觉光平面标定尺寸测量铁路限界　出处：《铁道科学与工程学报》2017年02期 　论文类型：期刊论文

【摘要】：异物入侵铁路线路严重危害行车安全,为及时发现异物并测量其尺寸,提出一种利用相机、异物和线激光空间几何关系计算图像中目标点世界坐标实现异物尺寸检测的方法。相机标定能够得到相机光心与目标点连线的直线方程,线激光投影中的点同时存在于线激光扫描平面和相机光心与该点的连线上。由于钢轨的约束,利用相机标定可以计算钢轨上线激光投影目标点的世界坐标,结合线激光光源坐标标定光平面方程。光平面方程和相机光心与该点连线方程的公共解为目标点的世界坐标。旋转线激光光源,求解异物多个断面关键目标点世界坐标,从而计算异物的三维尺寸。建立测量方法的数学模型并进行现场试验验证,结果表明,该测量方法能够较为准确地测量异物尺寸。
[Abstract]:The foreign body invades the railway line seriously endangers the driving safety. In order to find the foreign body in time and measure its size, a kind of using camera is put forward. The method of measuring the size of foreign body by the world coordinate of the target point in the calculation of the geometric relationship between the foreign body and the linear laser space. The calibration of the camera can obtain the linear equation of the connection between the camera's center of light and the point of the target. The points in the line laser projection exist simultaneously on the line laser scanning plane and the line between the camera center and the point. Due to the restraint of the rail, the world coordinates of the target point of the line laser projection on the rail can be calculated by using the camera calibration. The optical plane equation is calibrated with the coordinate of the linear laser source. The common solution of the optical plane equation and the line equation between the camera center and the line equation of the camera is the world coordinate of the target point. The rotation line laser light source is used to solve the world coordinates of the key target points of many cross-sections of foreign bodies. The mathematical model of the measurement method is established and the field test is carried out. The results show that the measurement method can measure the foreign body size more accurately.
【作者单位】：中南大学交通运输工程学院轨道交通安全教育部重点试验室;
【基金】：国家自然科学基金重点资助项目(U1334205)
【分类号】：U298;TP391.41

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