User Guide

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Operation

427-0200-00-12 - Revision 110 - May 2021

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, the sky is generally very cold. Defining the ROI to exclude the sky might improve contrast in the

rest of the image.

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.

Tip

When Show AGC ROI is selected, the mouse pointer is used to define the AGC ROI and it is not

possible to pan or tilt the camera. To use the mouse pointer to pan and tilt the camera, clear Show

AGC ROI or close the thermal settings panel.

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.