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How do I use the reference System of the "IVA Coordinate System Manager.vi"?

I do not understand how the vi "IVA Coordinate System Mmanager" is used. When I do create the LV-code from the NI Vision Assistant it gives me following fragment:

 

SC.png

 

Here the "reference System" input is set (the x-/y axis) automatically to the value 562.95 and 558.641 (see picture above). What indicates those values if I do pattern matching? And to which values I need to set it for any image where I do pattern matching? The output of this vi gives me a cluster with the origin and the measurement system. Even I set those two values to 0/0 it gives me the corect and new coordinate system of the found pattern but I'll get an NaN if I use the same function (pattern matching) twice in a row for a different image. In both cases NI Vision Assistant sets those two default values automatically.

 

 

thanks..!

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