Performance verification of a photogrammetric scanning system for micro-parts using a three-dimensional artifact: adjustment and calibration

Performance verification is a fundamental issue to assure the traceability of a measurement instrument. This issue is very important for non-contact 3D scanning systems, also for the limited number of existing standards. There are many factors affecting the process in a photogrammetric scanning system, and they have to be considered during a performance verification. In this context, it is crucial to completely define the camera model and its spatial locations and orientations during the scan, estimating the intrinsic and extrinsic parameters. There are two main proposals in this paper. Firstly, authors investigated on how the reliability of the adjustment procedure could be improved, adopting a more complex geometry of the reference object, using a three-dimensional one instead of a bi-dimensional pattern of targets. Secondly, an approach to a calibration procedure for photogrammetric scanning system has been drawn up and applied, using the same artifact used for the adjustment. The ISO 15530-3 2011 standard was adopted for the uncertainty assessment of the results.