Camera
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Max AGC gain
Use the Max AGC gain slider to optimise the signal level and brighten video images to
compensate for low-contrast conditions. Note that a high AGC gain level can introduce noise into
the picture.
AGC region
The AGC region defines the part of the scene to be used as a basis for calculating AGC
adjustment.
6.3.4
Radiometry
This tab is available on models with radiometric functionality.
Temperature compensation
The camera can compensate the temperature reading for scene emissivity and window
transmission and reflection (if applicable).
The correction for emissivity and window factors has been extended to include corrections for
atmospheric transmission. The model is based on the fact that the radiation from the scene is
attenuated by the absorption along the path and the absorbing elements are emitting radiation
related to the temperature of the element.
The following model is used for the temperature compensation:
The incident radiation onto the camera is given by:
Notation
Description
S
Video input data
ε
Target emissivity (emissivity of the scene)
τ
win
Window transmission (transmission coefficient of the window)
T
win
Window temperature
r
win
Window reflection
T
refl
Temperature reflected in the window
