Structure parameters field calibration of fly point scanning shape measurement system

The calibration of structure parameters of a triangulation-based fly point scanning shape measurement system is usually a non-linear problem. A practical and easy-to-use calibration procedure of such system was proposed and implemented. The proposed calibration procedure was based on the coordinate transformation between the feature points and their images taken by the measurement system. Several pictures of a special designed planar calibration board were taken from arbitrary orientations. There was no need to precisely measure the position and altitude of the calibration board. A planar board surface and a cylinder surface with known diameter were measured by using the obtained structure parameters. The average error of the distances between measuring points and the fitted plane or cylinder was used to evaluate the calibration accuracy. The proposed calibration procedure can meet the needs of the calibration such as validity and stabilization. It can also be used for the calibration of other triangulation based shape measurement systems.