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check to see if the desired orientation has been achieved, but that may not give the best image over
scene temperature.
Polarity / Palette:
The camera detects and images the SWIR illumination in a given scene. Within the
camera, these illumination values are mapped (as determined by the AGC algorithm selected) to a range of
0 to 255 values. In a black and white display mode, this range is converted to shades of gray with 0 being
totally black and 255 being totally white.
The range of these 0 to 255 gray shades can also be referenced to a Look-Up Table (LUT) permanently
stored in the camera to convert the scene to a color video image. Different LUTs are available to change
the appearance of the displayed image. The most common selection is either White Hot (objects with higher
illumination appear brighter than objects with lower illumination in the video display) or Black Hot (direct
opposite of White Hot). Since the difference between these two modes simply reverses the choice of darker
or lighter for illumination extremes, this is sometimes referred to as Polarity. Other color LUTs are available
as shown below.
Figure 26 below shows each of the LUTs as displayed in Test Pattern Ramp Mode starting with the upper
left: White Hot, Black Hot, Fusion, Rainbow, Glowbow, Ironbow1, Ironbow2, Sepia, Color1, Color2, Ice
Fire, and Rain. Select one of these LUTs from the pull-down menu to view the image displayed using the
chosen LUT. Setting the Polarity/LUT mode will not affect the CMOS or LVDS digital data output
Cold
Cold
Cold
Cold
Hot
Hot
Hot
Hot
White Hot
Black Hot
Fusion
Rainbow
Cold
Cold
Cold
Cold
Hot
Hot
Hot
Hot
Glowbow
Ironbow1
Ironbow2
Sepia
Cold
Cold
Cold
Cold
Hot
Hot
Hot
Hot
Color1
Color2
Ice Fire
Rain
Figure 26. Look-Up Table Options (as seen with test pattern enabled)
Simple experimentation with this feature while viewing the video image will provide familiarity.
Remember to click the Save Settings button on the Setup Tab to save the LUT settings as the default at
power-up.