Knowledge of appearance inspection: Global or rolling camera.
We also have rental cameras available at Cairo Logic, so please feel free to contact us.
The types of camera light sensors can be broadly divided into two categories: "global shutter" and "rolling shutter." The difference between these two lies in whether all the pixels of the sensor are exposed simultaneously (global shutter) or if they are exposed one line at a time from the top down (rolling shutter). How does this difference in mechanism affect the image? A typical example is the distortion shown below. When capturing a moving object, with a global shutter, a spherical object will be photographed as a sphere, but with a rolling shutter, because exposure occurs line by line from the top, the object may have moved during the exposure time, resulting in distortion. Thus, the differences between the two become apparent when photographing moving subjects. One might wonder, "Wouldn't it be better to use only global shutters?" However, in terms of manufacturing costs, rolling shutters are more advantageous (lower cost). (Figure 1: Left: Global Shutter, Right: Rolling Shutter)
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Therefore, industrial cameras with more than 5 million pixels generally use a rolling shutter lineup. Many of the camera sensors in your smartphones also use rolling shutters. Finally, it is important to note that it is not necessarily the case that "if you are photographing moving objects, you must choose a global shutter." When capturing moving objects, distortion will naturally occur with a rolling shutter; however, in cases where you want to detect foreign objects on a moving sheet, the distortion of the foreign objects may not affect detection performance. The choice between a global shutter and a rolling shutter will depend on the application and cost, but if you can use a rental camera, I think it is a good idea to first test with a rolling shutter, and if it meets your needs, then continue using the rolling shutter. Skylogic also provides rental cameras, so please feel free to contact us.
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