FLIR FC Series Installation Manual page 48

Advanced Configuration
AGC ROI: The AGC Region Of Interest
(ROI) determines what portion of the image
is used in the calculation of the AGC. By
default all of the pixels in the image are
considered (Full Screen); in some cases it
may be possible to improve the contrast if a
portion of the image is excluded. For
example, if the field of view includes a
portion of the sky, typically quite cold, it may
be desirable to restrict the ROI to the portion
of the image below the horizon.
When Custom is selected, a handle is
shown in the center of the screen.
Drag the handle to set
the size of the ROI box.
Drag the ROI box over
the portion of the scene
that will control the AGC.
AGC: The AGC parameters affect how the
overall IR video image appears. The default AGC
algorithm is suitable for most installations, but
further adjustments may provide a more appealing
image, depending on personal preferences. Be
aware that the settings that are optimal at one time
may be less optimal a short time later, since conditions such as weather and time of day affect the
image and are constantly changing.
Experiment with different AGC parameters to find the settings that work best for the particular
installation. Select Save Settings button at the bottom of the page to keep the settings after a power
cycle or select the Factory Defaults button to return the settings to default values.
• Brightness (ITT Mean) setting determines the temperature that is at the middle of the 256
"shades of gray" produced by the AGC. Positive values allow more detail in hotter scenes, while
negative values allow more detail in lower temperature scenes. Range is -4 to 4.
• Contrast (Max Gain) can be used to increase contrast, especially for scenes with little
temperature variation (it may also increase noise due to increased gain). Range is 12 to 24.
• Sharpness (DDE Gain) is used to enhance image details and/or suppress fixed pattern noise.
Positive values increase Sharpness, while negative values soften the image and filter fixed
pattern noise. A setting of 0 is neutral and will not have any effect. Range is -10 to 40.
• AGC Filter determines how quickly a scene will adjust when a hot object appears (or
disappears) within the AGC ROI. If set to a low value, when a hot object enters the ROI, the
AGC will adjust more slowly to the hot object, resulting in a more gradual transition. Range is 1
to 32.
427-0089-00-12 Version 160 March 2019
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