H04N 25/63

Definition

(Für diese Definition ist die deutsche Übersetzung noch nicht abgeschlossen)

Definition

• Circuits for detection and reduction of dark current.
• Circuits performing dark frame subtraction that remove an estimate of the mean fixed pattern, but there still remains a temporal noise, because the dark current itself has a shot noise.
• Circuits using optical black pixels for dark current compensation.
• Circuits using optical black pixels provided for each pixel or group of pixels.

Beziehungen zu anderen Klassifikationsstellen

The pattern of different dark currents can result in a fixed-pattern noise which is classified in H04N 25/67. Dark current is caused by charges generated in the detector when no radiation is entering the detector. Accordingly, only the fixed pattern noise caused by the dark current can be corrected or compensated. Dark current is temperature, exposure and pixel size dependent.