427-0100-00-12 Version 100
December 2018
19
The information contained herein does not contain technology as defined by EAR,15 CFR772, is publicly available, and therefore not subject to EAR.
Operation
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Video Format
When mounted indoors, the visible camera shutter speed may be synchronized to the 50 Hz or
60 Hz power used for lighting the scene. If lighting is connected to 50 Hz power, the PAL setting
may provide better video and conversely, NTSC may provide better video under 60 Hz lighting.
2.2.3
Thermal Image Setup - Thermal Page
In most installations it is not necessary to change the default settings of the thermal sensor. However
in some situations, depending on weather, time of day, or scene, it may be useful to make changes
to the video image to enhance the image by modifying one or more parameters. Be aware that when
the conditions change the camera may need to be adjusted again; it is also a good idea to know how
to restore the factory default settings.
Note
The Video Analytics detection is performed on video frames directly from the thermal sensor before
any adjustments such as AGC are made. The AGC and other adjustments are made only to the
thermal video streams and do not have an effect on Video Analytics.
AGC ROI
The region of interest (ROI) determines what portion of the image is used by the Automatic Gain
Control (AGC) algorithm to make adjustments to the IR sensor parameters. 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.
A handle is shown in the corner of the ROI.
Drag the handle to change
the size of the ROI box.
Drag the ROI box over
the portion of the scene
that will control the AGC.
