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BLACK CALIBRATION
Image sensors often exhibit small non-uniformities across pixels due to variances in temperature and
electrical signal characteristics. To compensate for these non-uniformities, commonly referred to as Fixed
Pattern Noise, a Black Calibration is performed.
During a Black Calibration, the camera automatically collects a black reference image, and then subtracts
that reference image from all frames captured subsequently, correcting for pixel variations that occur on
the image sensor. Pressing the Black Calibration button updates the reference image.
Black Calibration is unique to both resolution and gain. The Chronos will attempt to perform an automatic
“quick” black calibration when changing to a resolution that contains no prior black calibration reference
frame. For the best image quality when recording, perform a Black Calibration as close to the start of
filming as possible.
IMPORTANT: The image sensor must not be exposed to light when a Black Calibration is in
progress. Many lens apertures do not close the iris completely, so installing the lens cover prior to a
Black Calibration is recommended.
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