Definition of dark frame

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Photonics Dictionary

dark frame: A frame taken to identify electronic noise in a CCD imaging device. A dark frame is recorded without exposing the CCD to any external light by, for example, leaving the shutter of a CCD camera closed. The dark frame is given the same exposure time as the desired light frame. After the light frame is taken, the dark frame is subtracted from it, removing some of the noise from the image.

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