Camera Calibration Using Fiducial Markers: A Novel Tool for Automated PIV Systems

Abstract

Large-scale PIV system setup requires precise manipulation of every component, which is made possible using industrial robots. The precise positioning of the individual PIV components in accordance with the measurement requirements is made possible by the cameras’ known internal calibration matrix, the real pose of the industrial robots, and the computed transformation from the fiducial markers to camera coordinates. Furthermore, the degree of automation can be maximized since the entire calibration process for creating the external camera matrix and the mapping functions, such as de-warping the stereo images, can be automatically determined without additional user intervention. Particularly for measurement tasks with strict time constraints, the increased level of automation broadens the range of applications for PIV systems.