6
Fixed Color Cameras
Installation Manual
BACKLIGHT COMPENSATION (BLC)
When BLC dip switches are adjusted, an overlay window is displayed on-screen showing the
currently selected window. The overlay window will automatically disappear 5 seconds after
the last dip switch setting is made. Any parts of the scene that are not covered by the BLC
window will be ignored when determining the overall scene exposure.
Back Light Compensation feature - Example
People entering a building through a brightly lit doorway are to be monitored. Without backlight
compensation, a person entering the building would be seen in silhouette because the relatively
bright background would cause the camera to reduce its exposure.
By using the backlight compensation feature, it is possible to select a window around the area
of interest, i.e. the doorway. Choosing window
B
will ensure that the camera exposure system
only uses the central area of the scene to calculate the scene exposure. Therefore a person
entering the building will be clearly displayed.
AUTOMATIC GAIN CONTROL (AGC)
When switched on, the Automatic Gain Control feature will improve camera sensitivity when
the level of scene illumination is low. As scene illumination level decreases, color information is
reduced. For most applications the AGC feature should be switched on and is therefore the
default setting. Select
ON
or
OFF
using the
AGC
dip switch.
= area used to calculate the scene exposure
BLC OFF
BLC ON
