激光与光电子学进展, 2018, 55 (7): 071202, 网络出版: 2018-07-20  

采用低速相机测量轮的相对高速转动 下载: 767次

Measuring Relative High-Speed Rotation of Wheel with Low-Speed Camera
作者单位
河北工业大学机械工程学院, 天津 300130
摘要
采用机器视觉测量轮的转速具有高效、直观的特点。采用高帧速相机测量高转速会导致相机数据量激增。为了解决数据量过大的问题,提出了一种采用低速电子卷帘快门相机测量轮子转速的方法。低速电子卷帘快门相机采集相对高速转轮的图像时,卷帘快门会引起轮图像的几何畸变。利用这些畸变图像中的信息,可以求解出对应的转速,实现利用低速相机测量轮的相对高速转动的目的。为了揭示转动速度和图像畸变之间的关系,建立了旋转仿真模型,并在模型中验证了求解方法的有效性。为了解决空间中的轮被单目相机拍摄产生的二义性,提出结合轮的转速来消除二义性的方法。最后进行了验证实验,实验结果表明,采用低速电子卷帘快门相机能够测量高于相机帧速的转速,并且相对误差小于4%。
Abstract
Measuring the rotating velocity of the wheel with machine vision is efficient and straightforward. Measuring the high-speed rotation with a high-speed camera can generate massive data. In order to reduce the massive data, we propose a method to measure the relative high-speed rotation of the wheel by a low-speed electronic rolling shutter camera. This method bases on that the effect of rolling shutter can induce geometric distortion in the image when the wheel is rotating fast. The information in the distortion image can be used to get the rotating velocity of the wheel, and the purpose of measuring relative high-speed rotation with low-speed camera is realized at the same time. The proposed algorithm is validated in a simulation model which reveals the relationship between the rotation and the distortion image. In order to eliminate the dualistic caused by the spatial wheel photographed by a single camera, the rotation property of the wheel is researched. Finally, the verification experiment is carried out. The result of the experiment shows that this method can detect the rotating velocity which is higher than the speed of the camera, and the relative error is less than 4%.

赵义鹏, 李铁军, 王宁, 王旭之, 刘今越, 郭士杰. 采用低速相机测量轮的相对高速转动[J]. 激光与光电子学进展, 2018, 55(7): 071202. Zhao Yipeng, Li Tiejun, Wang Ning, Wang Xuzhi, Liu Jinyue, Guo Shijie. Measuring Relative High-Speed Rotation of Wheel with Low-Speed Camera[J]. Laser & Optoelectronics Progress, 2018, 55(7): 071202.

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