Bias frame

In digital photography, a bias frame is an image obtained from an opto-electronic image sensor, with no actual exposure time. The image so obtained only contains noise due to the electronics that elaborate the sensor data, and not noise from charge accumulation (e.g. from dark current) within the sensor itself. A bias frame is complementary to a dark frame, which has a charge integration time but in darkness. Since a dark frame contains noise inc... more

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