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          迪奧科技標語
          Correct understanding of industrial camera shutter
          Author:Administrator   Published in:2019-11-14 10:56

          Shutter is an important part of industrial camera. Its structure, form and function are important factors to measure the quality of camera. Electronic shutter has the advantages of low vibration and high speed, but it can't completely replace mechanical shutter in professional photography, because mechanical shutter can't synchronize well with high-speed flash, and mechanical electronic hybrid shutter is better in all professional fields, each taking its advantages. There are two common ways of electronic shutter: global shutter and rolling shutter.

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          Global shutter is achieved by exposing the whole picture at the same time. All pixels of the sensor collect light and expose at the same time. When the preset exposure time is up, the sensor stops collecting light and converts the exposure image into an electronic image. In this process, there is no actual shutter. At the beginning of exposure, the sensor begins to collect light; at the end of exposure, the light collection circuit is cut off, and the readout value of the sensor is a picture.

          Different from the global shutter, the roller shutter is realized by controlling the exposure of the chip line by line. Roller shutter does not have a real sense of the shutter, but through the on-off control of sensors, so that different parts of its sensitivity to light at different times is different. Expose line by line until all pixels are exposed. Of course, all actions are completed in a very short time, usually 1 / 48 to 1 / 60 second. It should be noted that the rolling shutter adopts the method of line by line exposure. If the object or camera is in a fast motion state during shooting, the shooting result may appear any situation such as "tilt", "swing indefinitely" or "partial exposure". Rolling shutter is a line by line sequential exposure, so it is not suitable for shooting moving objects. When the global shutter mode is used for exposure, all pixels are exposed at the same time, which is similar to freezing the moving object, so it is suitable for shooting fast moving objects. But the global shutter may appear as paste phenomenon. The appearance of image paste depends on the exposure time. If the exposure time is too long, and the object moves too fast, the image paste will appear; if the exposure time is very short, similar to the moving object frozen in an instant, there is little image paste.

          In the industrial field, flash is not needed, and the industry prefers the low vibration and high life of electronic shutter. If we want to detect dynamically, we use the camera with global shutter, which can avoid the jelly effect and slope phenomenon. If we are shooting statically, the shutter with rolling shutter is very suitable. The first reason is that the dark current of the global shutter is higher. (dark current: refers to the tiny current generated in the pixel even when the pixel is in a completely dark state. The typical dark current generation region includes the depletion region of PN junction and the surface of silicon wafer. Dark current is one of the main sources of pixel noise) will affect the image quality; the second reason is that it can save cost, also can effectively use the incident light energy, reduce the exposure time and improve the shooting efficiency.

          The above is the knowledge about "industrial camera shutter" shared by Teo technology editor, hoping to help you better understand industrial camera. In addition, if you have this need, you can call us at any time to get in touch with us, will provide you with quality products and sincere services, looking forward to cooperating with you!


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          亚洲国产剧情中文视频在线
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