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How to calibrate pixel coordination to world coordination?

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Camera is fixed on an XY table drived by servo motors.Camera takes pictures of object ,then calculates the offset.LabVIEW gives the offsets to servo motors.9 points calibiration method is usually recommended.Some vision softwares such as Visonpro,Halcon etc have special operators.All you have to do is to give these 9 points with pixels

coordination and world coordination to these operators.Their relations are calculated automatically. So how can I calculate the relation in LabVIEW?Any idea?

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