Figure 29: Contrast Enhancement Maximum Gain - Teledyne FLIR A68 Series User Manual

Maximum Gain
The maximum gain feature is used when the Contrast Mode (contrastMode) feature is
set to Dynamic Adaptive (AdaptiveDynamic). This feature only applies when the 16-bit
image has low contrast (image range is less than 255 DN). The maximum gain setting
determines the smallest range of 16-bit values (around the average value) that can be
stretched to fit 8-bits (0-255). For example, if a maximum gain of 10 is applied, a
range of at least 25 pixel values are mapped to 8-bit values. A maximum gain of 1
limits the window of 16-bit values around the average to 256, while a gain of 0.5 limits
the range to 512 values.
The maximum gain setting is useful for very low contrast scenes where the range of
values in the 16-bit image is very small and the dynamic adaptive contrast
enhancement would otherwise introduce noise and other image artifacts due to the
small amount of data present.
To enable the maximum gain feature, use the contrastMaxGainEnable feature, and set
the maximum gain value (contrastMaxGainValue feature).
16-bit image range = 25 DN
16-bit
Histogram
16-bit image range = 256 DN
16-bit
Histogram
Maximum Gain = 1X Maximum Gain = 10X
0 255
0 255
Maximum Gain Value Determines Range of Pixels to Map
Larger Maximum Gain = Smaller Range of Pixels in 16-bit Image to Map

Figure 29: Contrast Enhancement Maximum Gain

70 • Features and Configuration Options FLIR A68/A38 Series IR Camera User's Manual