Page 7
Installation Instructions
X Series DSP Cameras
FUNCTION SWITCHES
EI (Electronic Iris)
The EI (Electronic Iris) feature compensates for excessive light level by automatically adjusting
shutter speed. Selecting Electronic Iris disables manual shutter speed selection. The Electronic
Iris setting must not be used when the camera is set to Flickerless mode. The default setting is
Electronic Iris
ON
.
BLC (Back Light Compensation)
The backlight compensation feature can be used to eliminate the effect of an area of strong
background lighting in a scene. If a strong background light such as a window exists in a
scene, the camera will try to compensate for it by reducing the overall exposure. This would
mean that the areas surrounding the window would become too dark.
By using the backlight compensation feature, it is possible to select areas of the scene which
may be used to control the exposure. Typically, the object of interest lies in the centre of the
scene and this is the area normally used to calculate the exposure. The edges, where strong
backlighting is likely to be, are ignored.
The BLC feature is switched
ON
or
OFF
using switch SW2-1 and SW2-3. Switch SW2-1 must
be up. Default is
OFF
. BLC will only function with a manual iris lens when the Electronic Iris
feature is switched on. For direct drive and auto iris lenses, BLC will still function even though
the Electronic Iris feature is switched off.
To facilitate backlight compensation, eight pre-defined windows are provided. To select a
window, first, press the BLC window activation switch (see figure 1). This will superimpose
the currently selected window over the video output on the monitor. Use the three dip switches
SW1-4, SW1-5 and SW1-6 to select one of the pre-defined windows according to the diagram
below.
.
SW1
SW2
SW3
1
1
1
2
2
2
3
3
3
4
4
4
5
6
EI ON
EI OFF
1 2
SW1
SW2
SW3
1
1
1
2
2
2
3
3
3
4
4
4
5
6
BLC ON
BLC OFF
1 3
4
4
4
4
4
4
4
4
6
6
6
6
6
6
6
6
5
5
5
5
5
5
5
5
A
F
G
H
B
C
D
E
= area used to calculate camera exposure
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