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Chapter 15 Menus and Dialog Boxes 229
Control Box Focus Window
Selecting
Video Focus
on the Acquisition Setup menu with V/ICCD as the selected
controller opens the Control Box window. This window contains two tab pages, Camera
and Box (Figure 203). The Camera tab page is identical to the V/ICCD Focus Camera
tab page. The Box tab page gives software control over the Control Box parameters as
described in the following paragraphs.
Parameters
Offset:
The Offset parameter allows the video to be shifted negatively. The range is in
arbitrary units from 0 to 99 and the default setting is 10.0. The higher the setting,
the larger the offset that will be subtracted from every pixel in the image, in
effect shifting the entire image towards black. Used in conjunction with the
intensifier gain setting, this is particularly useful in applications where images
have very low contrast. You can offset the gray level down to black and then
increase the intensifier gain to bring up the residual contrast for the best possible
image. Note, however, that CCD well capacity limitations constrain the amount
of contrast enhancement that can be achieved.
The Automatic Gain and Automatic Black function should be OFF for the Offset
function to have any significant effect.
Edge Enhance:
This function increases the video high-frequency response, causing
edges in the image to become crisper. The range is 0 to 99 and the default setting
is 50. Note that the Edge Enhance box must be checked as well to activate the
Edge Enhance function.
Figure 203.
Control Box
Focus tab
pages.