Shaft diameter measurement using digital image composition at two different object distances

摘要

A new machine vision measuring scheme was presented to improve the measurement accuracies of machine vision systems with an ordinary industrial lens and thus to address the extensive requirements for accurately measuring the diameter of shafts.First,method for measuring diameters based on two images was derived on the basis of a pinhole imaging principle,similar triangles and tangent property theorems.Then,a machine vision measuring system was introduced.Finally,experiments were performed on a transmission screw,and the results indicate that the method has achieved a higher measurement accuracy,with systematic errors of approximately 2 urn and uncertainties of 4.9 urn.