Analysis and comparison of projector calibration methods to reduce the uncertainty propagation of camera calibration on a camera-projector measuring system

摘要

The accuracy of 3D measurement systems formed by a camera-projector pair depends directly on the calibration procedure used. The projector is usually modelled as the inverse projection of a pin-hole camera, which presents the option to calibrate the system by two different approaches: as a whole system or separately. The most common approach is the use of a camera previously calibrated, followed by the calibration of the projector. Studies show that the uncertainty of the camera parameters from its calibration propagates to the projector parameters. The objective of this study is to have a clear comprehension of the relationships between the camera and projector parameters and of how uncertainty is propagated. This will be done by using a camera previously calibrated by Zhang's method, followed by the calibration of the projector, using Tsai, Zhang and Direct Linear Calibration (DLC) method.