Third, the finite time
delay in adjusting gains sometimes resulted in a positive feedback
loop where the user would move the camera head in responses to
the effects of the changing gain, which would then initiate a new
round of gain change. Fourth, the time delay associated with waiting
for automated gains to stabilize increased effective scanning
times and times for acquiring hyperspectral data cubes. A single,
selectable, gain setting proved to be impractical because of variationsvariations
in ambient lighting intensity due to location within a facility
and wavelength dependent differences associated with the type of
ambient lighting used in the facility.