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Chapter 15 Menus and Dialog Boxes 375
Gamma Circuit:
When checked, turns on the gamma function, displaying the video
with a gamma of nominally 0.45. The effect is an overall brightening of the mid-
range values in the picture. In effect, the brightness scaling of the scene is
compressed to achieve greater dynamic range at the expense of linearity. For
quantitative work, it is generally better to leave the gamma unchecked, since the
0.45 value is nominal only. Cameras may need to be individually calibrated.
Note that the amount of post CCD gain also affects gamma.
Automatic Black:
When checked, together with AGC, provides an automatic contrast
stretch function. It attempts to darken the darkest portions of the image to black.
Although its range is limited by hardware constraints and its usefulness depends
on scene contrast, it can be quite helpful in viewing low contrast images.
Control Buttons:
Close:
Implements any setting changes and closes the window.
Help:
Displays context-sensitive help for the V/ICCD (Focus) tab page.
V/ICCD Control Box Focus Window
Selecting
Video Focus
on the Acquisition Setup menu with V/ICCD Control box as
the selected controller opens the Control Box window (Figure 337). This window
contains two tab pages, Camera and Box. The Camera tab page is identical to the
V/ICCD Focus Camera tab page previously described. The Box tab page gives software
control over the V/ICCD Control Box parameters as described in the following
paragraphs.
Figure 337.
V/ICCD
Control Box
Focus tab
pages.