Black Level - DAGE-MTI CCD-100 User Manual

Note: When using the camera in the AUTO EE mode
under certain types of lighting such as fluorescent, the
camera's output signal may seem as though it is
changing in level. This is due to the cyclical nature of the
fluorescent light. While the human eye is not capable of
viewing the light difference cycle of fluorescent lighting,
the shuttered CCD is able to see it.

BLACK LEVEL

The black level determines the output level of the darkest
portions of the image. The
manual or automatic mode to set the output video's blacks.
MANUAL
In the
determined by the
switch. This control allows the user to set the black level
to the desired position. Note that the detail below the
black set point will be lost, so the black level should be
set such that all of the useful information is visible.
AUTO
In the
the video signal are determined by the camera. This
position is useful in applications where the contrast level
of the incoming light is low and it is necessary for the
camera to expand that contrast. The camera will take the
darkest portion of the signal, which may not be close to
black in reality, and pull it down to black. This has the
effect of actually "stretching" the contrast of the signal.
Care should be taken to realize that the output signal may
not truly represent the input light level when the camera
is in this position.
BLK
black position, the video black level is
MAN
BLACK
black position, the darkest portions of
AUTO
switch allows either a
pot located above the
BLACK