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IPU 40285 Version E Jan 2013
10
6.6.1.1.
Linear(Mean)
In the Linear Mean mode the gain and offset are defined by the mean value of all the
temperatures in the selected region.(see section 7) Therefore when a hot or cold object
enters the scene there is little change in the brightness and contrast of the image.
(Figure 10 & 11)
6.6.1.2.
Linear(Median)
In the Linear Median mode the maximum and minimum temperatures in the scene are
used to define the gain and offset of the displayed image. Therefore when a hot or cold
object enters the scene the brightness and contrast change rapidly to highlight the
object. (Figure 12 & 13) This setting can be altered further. – See section 7.
6.6.1.3.
Histogram
In histogram mode the colours displayed are based on the temperature histogram of the
scene. As the display is dominated by the background, when a hot or cold object enters the
scene there is very little change in the brightness and contrast, making this mode more
suitable for video content analysis requiring a stable background scene. (Figure 14 & 15). For
more setting details see section 7.
Mean
Figure 10. No object in Scene.
Figure 11. Hot Objects in Scene.
Median
Figure 12. Small object in Scene.
Figure 13. Hot Objects in Scene.
Histogram
