倾斜位置成像的轮对几何参数计算方法

Calculation method of wheel set geometrical parameters by imaging at inclined position

基于光截图像的轮对几何参数在线检测中,由于检测环境的特殊性,面阵CCD摄像机的安装位置受到很大限制。提出一种依据摄像机沿倾斜角度采集轮对光截曲线图像进而计算轮对几何参数的检测新方法。利用摄像机在空间三个方向上的倾斜角度,计算出轮对几何参数关键点在图像中的位置,进而计算出轮对几何参数,最终完成了轮对轮缘高度和轮缘厚度的计算。设计了验证实验,实验结果表明:该方法检测精度可达±0.2 mm。

On-line detection of wheel set geometric parameters based on optical cross section image, mounting position of planar array CCD camera are greatly restricted because of particularity of detecting environment, and there exist a large distortion of the collected image. A new method is proposed to calculate wheel set geometric parameters based on camera along tilt angle collecting optical curve image. According to tilt angles of camera in three direction in space, calculate position of the key points in the image, and calculating the object length. Finally calculation of wheel set flange height and flange thickness are completed. Verification experiment is designed according to site installation position, and the experimental result shows that, the detection precision of this method can reach ±0.2 mm.