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Optimization Tab
The Optimization tab, shown in Figure 25Error! Reference source not found. below, provides the ability
to control the Automatic Gain Control (AGC) features and the enhancement algorithms. Parameters for a
given mode are contextually made available depending on which mode is selected. If configuration options
are changed in the camera the Save Settings button should be used before resetting the camera. Factory
Defaults helps the customer return the camera to the options originally configured by the factory when
shipped.
Figure 25. FLIR Camera Controller GUI -- Optimization Tab
AGC Modes: There are four Histogram Equalization Modes included in the Tau SWIR camera. There are
also four Legacy Modes for customers wishing to stay with existing AGC modes from previous revisions
of FLIR cameras.
Histogram Equalization Modes:
The Plateau Histogram Equalization algorithm seeks to maximize
the dynamic range available for the content of the scene. It does this using a transfer function that is based
on the number of pixels that are in each bin and allocating more 8-bit range for that bin. The Plateau value
is the pixels/bin limit when the transfer function is maximized. When this number is small, the Automatic
AGC will approach a linear algorithm that preserves a linear mapping between the 14-bit and 8-bit data.
The goal of the Automatic algorithm is to try and make each of the 255 bins have the same number of
pixels in it, which should give the best contrast for the given scene. When the plateau value is higher, the
algorithm is more able to redistribute the data to achieve this goal. This prevents wasted levels of grey on
regions that have no scene content and can visually be seen in the histograms by noticing that peaks are
much smoother and the data is spread much more evenly.
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The information contained in this document pertains to a dual use product controlled for export by the Export Administration
Regulations (EAR). Diversion contrary to US law is prohibited. US Department of Commerce authorization is not required prior to
export or transfer to foreign persons or parties unless otherwise prohibited.
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