Measuring Relative High-Speed Rotation of Wheel with Low-Speed Camera

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 dualistie 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%.