FLIR Tau Camera TAU-0035-00-10 User Manual page 35

Tau User's Manual
Polarity/LUT:
The Tau camera detects and
images the temperatures in a given scene. Within the
camera, these temperatures 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 grey with, for
example, 0 being totally black and 255 being totally
white. The 0 to 255 grayshades range sensed is
referenced to a Look-Up Table (LUT) permanently
stored in the camera to convert the scene to a video
image. Different LUTs are available to change the
appearance of the displayed image. The most common
selection is either White Hot (hotter objects appear
brighter than cooler objects in the video display) or
Black Hot (hotter objects appear darker than cooler objects). Since the difference between
these two modes simply reverses the choice of darker or lighter for temperature extremes, this
is sometimes referred to as Polarity. Other color LUTs are available as shown below.
Figure 3-7 shows each of the LUTs as displayed in Test Pattern Ramp Mode starting with the
upper left: White Hot, Black Hot, Fusion, Rainbow, Globow, Ironbow1, Ironbow2, Sepia, Color1,
Color2, Ice Fire and Rain. Select one of these LUTs from the pull-down menu to view your image
displayed using the LUT you choose.
Cold Cold
Hot Hot
White Hot
Cold
Hot
Globow
Cold
Hot
Color1
Simple experimentation with this feature while viewing the video image will give you familiarity.
Remember that you must click the Save Settings button on the Setup tab to save the LUT
settings as default at power-up.
Note
The setting of the Polarity/LUT mode will not affect the digital data output.
TAU-0035-00-10, version 150
Cold Cold
Hot
Black Hot
Cold Cold
Hot
Ironbow1
Cold Cold
Hot
Color2
Figure 3-7: Look-Up Table Options
June 2011
3—Basic Operation of the Tau and GUI
Cold
Hot
Fusion Rainbow
Cold
Hot
Ironbow2 Sepia
Cold
Hot
Ice Fire Rain
Hot
Hot
Hot
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