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60
Accessing Your Image Acquisition Device
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Before we show how to modify parameters, some words of warning: Please keep in mind that
parameters should be modified with care, after reading the online documentation! Otherwise, you might cause your ActivVisionTools application to hang or crash.
Another warning regards the so-called volatile grabbing which is offered by some image acquisition devices. If you select this mode, images are not stored in memory but overwritten
continuously, using two buffers. This speeds up image grabbing significantly. However, volatile
grabbing must not be used when working with ActivGeoCalib!
We continue with the example of the last double page. The following steps are visualized in
figure A.2.
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If the box √ Update Image is checked, an image is grabbed when a parameter is
changed. Therefore, the result can be judged immediately. You can uncheck this option
if you want to make a series of changes or if parameters must be set together, and turn it
on again to check the result.
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Individual parameters can be reset to their default values by clicking the corresponding reset button. The default values set by the HALCON image acquisition interface or the SDK of the image acquisition device are used, which can
be found in the HTML documentation of HALCON image acquisition interfaces
(http://www.halcon.com/image-acquisition).
To reset all parameters at once, click the button Reset All .
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ActivView / 2008-04-23
You can update the parameter list (and value ranges) by clicking the button Refresh .
This is useful when a parameter change causes different value ranges for other parameters, e.g., when changing the camera type.