A calibration system in accordance with the invention, which is
implemented at least in part in digital hardware, can calibrate for at
least one of pixel offset and pixel gain. Calibration for pixel offset
can include a pixel range adjust process which sets up the range for
pixel offset calibration while also providing an offset level setpoint.
Video output from the pixel range adjust process can be input into a
pixel offset process which calibrates the video for offset. Calibration
for pixel gain can include an automatic gain control process which sets
up the range for pixel gain calibration while also providing for
continuing compensation for changes in video intensity. Video output from
the automatic gain control process can be input into a pixel gain process
which calibrates the video for gain.