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12
About I/O, synchronization, and measurement
ln(x) is the base-e logarithm of the x parameter, and S corresponds to the 14-bit pixel
value.
Register name
Type
R
Integer
B
Float
F
Float
O
Float (handles only positive vales)
OInt
Integer (same as O but handles negative values)
Please note that these registers will be automatically updated when switching between
the high gain mode and the low gain mode.
The FLIR GEV Demo sample illustrates how to use this conversion formula.
You also have the option to do your own one-point calibration by adjusting the offset val-
ue (register OInt) by pointing the camera at an accurately known temperature. Knowing
the temperature, you can then calculate the offset value and update the OInt register.
The FLIR GEV Demo sample illustrates how to perform this kind of calibration. Please
note that you will need to save the current settings if you want the new offset value to be
persistent. Use the command register SensorSetDefaults to set all current settings as
power on defaults.
There are additional registers that also affect the temperature linear output. These regis-
ters are grouped together as Object Parameter registers. These registers only affect the
transformation of detector signal values to temperature values when the camera is in
temperature linear mode.
ReflectedTemperature: The estimated reflected background temperature for the target
scene.
ObjectEmissivity: The target scene emissivity factor. The default value is 1.0.
WindowTransmission: The estimated transmission factor for the protective window.
The default value is 1.0.
WindowTemperature: The external window temperature T
AtmosphericTransmission: The estimated transmission factor for the atmosphere be-
tween the camera and the scene.
AtmosphericTemperature: The estimated temperature T
tween the camera and the scene.
The correction for scene parameters is extended to include the following parameters:
Figure 12.2 1: Scene, T
; 2: Reflected background temperature; 3: Atmosphere, T
scene
dow, T
; 5: Infrared camera.
win
#T559770; r. AL/81723/81723; en-US
(in kelvin).
win
for the atmosphere be-
atm
; 4: External win-
Atm
19
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