7.5 Settings behaviour during startup
Settings contain all the parameters that are needed to prepare and program the device for the
image capture. Every image can be captured with completely different set of parameters. In almost
every case, these parameters are accessible via a property offered by the device driver. A setting
e.g. might contain
The gain to be applied to the analog to digital conversion process for analog video sources
or
•
The AOI to be captured from the incoming image data.•
So for the user a setting is the one an only place where all the necessary modifications can be
applied to achieve the desired form of data acquisition. For GenICam interface layouts all device
properties modified during a continuous acquisition will have immediate impact on the next frame
transmitted by the device thus here when a precise moment to change settings is needed,
continuous acquisition must be stopped and then restarted after modifying the features.
Now, whenever a device is opened, the driver will execute following procedure:
Figure 11 : wxPropView - Device setting start procedure
Please note that each setting location step in the figure from above internally contains two
search steps. First the framework will try to locate a setting with user scope and if this can't
be located, the same setting will be searched with global (system-wide) scope. Under
Windows® this e.g. will access either the HKEY_CURRENT_USER or (in the second step)
the HKEY_LOCAL_MACHINE branch in the Registry.
•
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