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Basic Operation and Configuration
IR > AGC ROI
The IR camera adjustments to the region of interest (ROI) determine what portion of the image is used
by the Automatic Gain Control (AGC) algorithm. By default all of the pixels in the image are
considered; in some cases it may provide an improved image if a portion of the image is excluded. For
example, the sky is generally very cold, so if the ROI excludes the sky it may add more contrast to the
rest of the image. A pull-down list offers some convenient options.
IR > AGC
The AGC parameters affect how the overall IR video image appears. Using the AGC button on the Live
Video page (refer to
The default algorithms are suitable for most installations, but each selection allows a combination of
further adjustments that 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.
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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
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temperature variation (it may also increase noise due to increased gain). Range is 12 to 24.
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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.
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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.
427-0075-01-12 Version 110
Toggle Automatic Gain Control (AGC), pg.
November 2017
24), toggle through five AGC algorithms.
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