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Operation
23
427-0108-00-10 - Revision 100 - December 2020
AGC ROI
The camera's Automatic Gain Control (AGC) algorithm adjusts the thermal video according to the region
of interest (ROI). By default, the ROI is Full screen; the camera's AGC algorithm considers the entire
image. In some cases, defining an ROI that excludes a portion of the screen can improve the image. For
example, if there is an air conditioning vent in the image. Defining the ROI to exclude the vent might
improve contrast in the rest of the image.
Caution
The camera's video analytics rely on accurate and useful AGC settings. Radical changes to the ROI
can affect the camera's video analytics features; for example, canthus detection.
In addition to Full screen, you can select from a number of preset options or manually define the ROI by
selecting Custom.
By default,
Show AGC ROI
is selected and the AGC ROI appears as an overlay in the live video on the
camera web page. The AGC ROI overlay does not appear in the video stream itself.
Defining a custom AGC ROI
To change the size of the ROI: Hover over the
handle in the bottom-right corner of the ROI,
and then click and drag it.
To move the entire ROI: Hover over the ROI, and
then click and drag it.
As soon as you manually change the size of the ROI or move it, the AGC ROI setting automatically
changes to Custom.
AGC Image Settings
In some cases, changing the AGC image settings can provide a better image, depending on personal
preferences, display devices, and so on.
·
Brightness
(Gamma)—Determines the allocation of the 256 “shades of gray” produced by the AGC.
Values above 50 allocate more shades of gray to hotter objects, while values below 50 allocate more
shades of gray to lower temperature objects. Range 0 to 100.
·
Contrast
(Max Gain)—Increasing contrast can provide a better image, especially for scenes with little
temperature variation. (It might also increase noise due to the increased gain.) Range 0 to 100.
Tip
Changes to the default contrast setting affect scenes with little temperature variation more than they
affect scenes with greater temperature variation.
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