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To measure the angular velocity, a simulation is created to demonstrate through images that the propeller rotates at different speeds. In this paper, an ERS camera works as a sensor to measure the angular velocity of the propeller which rotates faster than the speed of the camera. The previous researches did not attempt to measure the high-speed rotation by an ERS camera. Those objects are very common in machines and easy to be analyzed to extract angular velocities. This special property would help measure the high-speed rotation of some objects, such as wheels or propellers which have symmetrical structures. The row speed of an ERS camera is much higher than the speed of the camera. There are few studies on measuring the high-speed rotation with a low-speed camera.
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But when the angular velocity is much higher than the camera’s speed, it is difficult to find out the angle for the ambiguity or the distortion in the image. In other words, it is measuring a high-speed rotation with a low-speed camera. The other way is to reduce the speed of the camera. One way is to reduce the resolution of the camera, but this way is not consistent with the development trend of cameras. There are two ways to improve the processing speed. Measuring angular velocity with computer vision also has some defects, such as the environmental air quality and time-consuming process. Zhu and Yu measured angular velocities of the object by Hough transform. He and Wei measured a shaft’s velocity by using the ERS camera. measured the object pose and motion from a single ERS image with automatic 2D-3D matching. His method was based on the assumption that all the lines in the real world were straight and those lines warped in the image captured by the ERS camera. obtained the object pose and velocity by an electronic rolling shutter (ERS) camera. Angular velocities could be extracted in those motion-blur images in polar coordinates. measured motor angular velocities with blur images which had motion information. Over the past decade, some researchers have focused on angular measurements based on computer vision. The advanced sensors can overcome the defects of contact-type sensors, and computer vision could be more widely used compared with the other noncontact sensors. In the past twenty years, noncontact methods have been developed like tomography, ultrasound, laser, and computer vision. These methods are usually based on mechanical contact, and as a result, they are easily affected by the rotation of the target or the small target inertia. To measure angular velocities, contact-type sensors are widely used, such as mechanical tachometers, optical tachometers, photoelectric encoders, and optical encoders. So it is important to measure the angular velocity. The rotation should be under control to keep machines in good operation, and a lot of mechanical failures are caused by the rotary movement. Rotation is one of basic motions, which is common in machines like motors, gears, and other wheels. The experimental results showed that this method could detect the angular velocities which were higher than the camera speed, and the accuracy was acceptable. The proposed method was applied to measure the angular velocities of the two-blade propeller and the multiblade propeller. In order to reveal the relationship between the angular velocity and the image distortion, a rotation model has been established. The effect of rolling shutter can induce geometric distortion in the image, when the propeller rotates during capturing an image. In order to reduce the collected data from the camera, a camera using ERS (electronic rolling shutter) is applied to measure angular velocities which are higher than the speed of the camera. A defect of the measurement with cameras is to process the massive data generated by cameras. Cameras can be employed as remote monitoring or inspecting sensors to measure the angular velocity of a propeller because of their commonplace availability, simplicity, and potentially low cost. Noncontact measurement for rotational motion has advantages over the traditional method which measures rotational motion by means of installing some devices on the object, such as a rotary encoder.