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Home > News > Common sense of industrial cameras - What are roll shutters and global shutters? - Dushen Technology
Common sense of industrial cameras - What are roll shutters and global shutters? - Dushen Technology
Release time:2019-12-16
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 Common sense of industrial cameras - What is a curtain shutter?
     First of all, to understand the shutter is an important part of industrial camera, its composition, form and function is an important factor to measure the camera grade. Common electronic shutters are global shutters and rollingshutters, which are exposed at the same time by the entire picture. All pixels of the sensor collect light at the same time and exposure. When the preset exposure time is up, the sensor stops collecting light and turns the exposure image into an electronic image. In this process, there is no actual sense of the shutter existence. At the beginning of the exposure, the sensor begins to collect light, and at the end of the exposure, the light collection circuit is cut off and the sensor reads a picture.

Unlike the global shutter, the curtain shutter is achieved by controlling the chip's line-by-line exposure. The shutter shutter does not have a shutter in the actual sense, but instead controls the sensor through a power-down, making it differently sensitive to light at different times. Exposure line by line until all pixels are exposed. Of course, all the actions are completed in a very short time, typically 1/48 to 1/60 seconds. It is important to note that the roll shutter is exposed line by line. If an object or camera is in rapid motion during shooting, the result may be "tilt," "swing," or "partial exposure."

The roll shutter is a line-by-line sequence of exposure, so it is not suitable for shooting moving objects. When exposed in a global shutter mode, all pixels are exposed at the same time, similar to freezing a moving object, making it ideal for shooting fast-moving objects. But the global shutter may appear like a paste. The appearance or failure of a paste depends on the length of exposure. If the exposure time is too long, and the object moves too fast, it will appear like paste, if the exposure time is very short, similar to the moving object frozen in an instant, then there is less like paste.
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