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8.2 – On-screen menus
NOTE: The action to be performed is the one that is displayed in the menu. For example, if the feature
Narrow FOV is listed, the system is currently using the WFOV and the selection will zoom in on the target.
If the system is already using NFOV, the feature would be listed as Wide FOV. Selecting this would return
the system to normal display.
8.2.2
Autofocus
The A button performs an image calibration to correct for image non-uniformities that
arise due to the slightly different gain characteristics that occur from detector to de-
tector within the array.
In IR mode, pressing the A button < 1 second will perform an image calibration. In
both IR and TV mode, pressing the A button > 1 second will perform an auto-focus
sequence. This is the default behavior. The behavior can be inverted by changing
the setting for Nuc button (Setup → Image).
To make it possible for the imager unit to autofocus properly, there are a few things
that the user should think about.
To think about when autofocusing
The area that the imager uses when autofocusing is a 64 × 64 pixel box, centered vertically and hori-
zontally on the screen.
The imager will have difficulties autofocusing when the image has low contrasts between different areas.
To make it possible for the imager to autofocus properly, it is important that there are no moving objects
inside the 64 × 64 pixel box during the autofocus adjustment.
Horizontal or vertical lines in the image should not be parallel to the pixel lines on the screen.
The imager will experience difficulties autofocusing if it is completely out of focus when beginning the
autofocus sequence.
When auto-focusing in NFOV (narrow field-of-view) the distance to target must be more than 15 m
/ 49.2 ft.
When auto-focusing in WFOV (wide field-of-view) the distance to target must be more than 2 m / 6.6 ft.
16
Publ. No. 1 557 544 Rev. a121 – ENGLISH (EN) – October 6, 2005
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