
427-0116-00-10 Revision 130 Copyright © 2010 FLIR Systems, Inc. 15
Infrared Panel The Infrared panel contains the Video and AGC tab and a General tab, shown in
Figure 10 and Figure 11. These tabs provide the ability to control the infrared camera from the PC. The
Video and AGC tab provides for basic image optimization along with camera control. The General tab
allows for further camera control to set power-on defaults and get further camera data. The infrared
camera commands for the PTZ-35 MS / PTZ-50 MS software interface are listed in section 10.0
Software Control Functions.
Video and AGC: provides infrared camera video and AGC settings
1. Polarity. Imagery can be displayed in either white-hot (hotter objects appear brighter than
cooler objects) or black-hot (hotter objects appear darker than cooler objects.
2. FFC. The infrared camera includes an internal shutter for periodically improving image quality
via a process called “flat-field correction” (FFC). During an FFC, a small calibration flag rotates
in front of the detector array, presenting a uniform temperature (i.e. a “flat field”) to every
detector element. Auto mode performs the FFC based on a change in ambient temperature
and Manual mode only performs the FFC when input by the user. Both modes allows for an
instantaneous FCC by depressing the “Do FFC” button.
3. Electronic Zoom. The camera will perform a 2X zoom controlled by the user.
4. AGC Type. The image can be optimized using an Automatic Gain Control or AGC type
algorithm. The three AGC types available are Plateau Equalization, Linear Histogram and
Logarithmic. Definitions for each are described below.
a. Plateau Equalization: The plateau equalization uses a histogram equalization algorithm
(HEQ) to analyze the scene content in real time and redistributes the dynamic range of
the scene.
b. AutoBright: The auto bright algorithm allows for the contrast and brightness bias to be
set while maintaining the offset automatically.
c. Linear Histogram: The linear histogram algorithm uses scene statistics to set a global
linear gain and offset (contrast and brightness) for the image.
d. Manual: The manual setting allows for user control for contrast (gain) and brightness
(offset) for the image.
5. AGC Parameters. The image can be further optimized using the AGC Parameters to control
the Plateau Value, Mid ITT Offset and Max Gain. All of these terms allow the user to optimize
the image based on the scene content.
6. Region Of Interest. The Region Of Interest or ROI determines what portion of the screen will
be used for the AGC calculations. The Full Screen option applies the AGC algorithm based on
scene content on the full screen. The Horizon Optimized applies horizontally across the screen
but uses only the middle third in the vertical direction. The Sky Optimized applies horizontally
across the screen but only the top half in the vertical direction. The Ground Optimized applies
horizontally across the screen but on the lower half in the vertical direction. The other modes
are applied using the center of the screen as 0, 0.
7. Detail Enhancement. This option applies a Bi-Lateral filter to enhance the image. The default
values are 16, 24, 32, 64, 96 and 128.