Calibration Techniques
Calibration of the sensors provides real world coordinates from the sensor data. 3DM Devices provides calibration as an integral part of all products with results traceable to our Mitutoyo 3 axis coordinate measuring machine. A number of different techniques are available using either known objects, flat target arrays, or direct measurement on the Coordinate Measuring Machine. In all cases, the resulting calibration is available for real time conversion of sensor data. Calibration is provided as a factory service option or on site for qualified users. Examples of each calibration technique are shown below, the detailed implementation of these is proprietary.
	Known Object Inclined planes employed for YETI foot scanner 8 cameras calibrated simultaneously as scan head traverses target Object is placed in two different orientations for X and Y calibrations Precise kinematic mount provides repeatibility and ensures orthogonality of axes
Target Array Flat array of rear illuminated dots Centre of dots is determiend to sub-pixel accuracy in camera image Proprietary data reduction, smoothing and inversion algorithms produce calibration Look Up Tables for real time use Technique is used for factory and on-site calibration. Quick and accurate results
	Direct Measurement Coordinate Measuring Machine provides accurate positioning of calibration target Data acquired for multiple X and Y planes Proprietary data reduction, smoothing and inversion algorithms produce calibration Look Up Tables for real time use