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EV3000-D manual
Equipment described herein may require US Government authorization for export purposes. Diversion contrary to US law
is prohibited. ©2008 United Vision solutions, Co., Specifications are subject to change. Check website:
www.unitedvisionsolutions.com
1. The EV3000-D Thermal Camera Image Control & Optimization
1.1 Thermal Imaging Basics
The thermal detector used in the EV3000-D thermal camera is an InSb FPA. This integrated circuit has an
array of 640 x 480 individual elements that absorb incident IR energy and convert it to electrical charge,
which can be read out to form an image. The FPA will detect IR energy over a broad range of
temperatures, and with very high resolution. The object of adjusting the FPA controls is to adjust the
sensitivity of the FPA to the temperature scene and map the result into the gray scale of the display.
The Level setting adjusts the center temperature of the display range. The Gain setting adjusts how wide
a range of temperature will be mapped into the gray scale of the video display. Auto level mode uses
internal circuitry to set the level to a point that keeps most of the display within the video gray scale.
Auto Gain mode will adjust the gain to accommodate all of the temperatures in the scene.
Histogram equalization is a computing function that will adjust the dynamic range of the display to
provide the best display of the scene. This function is applied to each frame to allocate the display
dynamic range for differing scene conditions.
A series of pictures of the same scene with different level and gain settings is presented in Figure 1.1-1 to
show how the settings affect the display.