FLIR Camera Adjustments
102-PS242-100-01
Rev110
June 2014
Page 17 of 28
ACE Threshold. The Active Contrast Enhancement (ACE) feature provides a contrast adjustment
dependent on the relative scene temperature. ACE thresholds greater than 0 impart more contrast to hotter
scene content and decrease contrast for colder scene content (e.g. sky or ocean). ACE threshold less than
0 do the opposite by decreasing contrast for hotter scene content and leaving more of the gray-scale
shades to represent the colder scene content. Figure 19 illustrates the effects of ACE. FLIR recommends a
conservative setting of 3 for generic use-case scenarios.
(a) ACE threshold =
-4
(b)
ACE threshold =
0 (neutral)
(c) ACE threshold =
8
Figure 19:
Illustration of Active Contrast Enhancement (ACE)
SSO Value. The Smart Scene Optimization (SSO) value defines the percentage of the histogram that will
be allotted a linear mapping. Enabling this feature facilitates the avoidance of irradiance level
compression, which is specifically important for bi-modal scenes. With SSO enabled, the radiometric
aspects of an image are better preserved (i.e. the difference in gray shades between two objects is more
representative of the difference in temperature). While radiometry is better preserved with this feature, the
compromise is the optimization in local contrast. Figure 20 illustrates the effects of SSO. In the left
image, SSO is disabled and the hot object and person get mapped to two shades of gray next to one
another causing a “washed out” effect and making it appear as though the person and fire are similar in
temperature. In the right image, SSO is enabled, and the hot object and person are decompressed with
gray shades separating them.
