Behaviour and accuracy specification - study on an LED-CMOS camera 3D measuring sys tem

D photogrammetry measuring systems using LED targets and CCDiCMOS Cameras are gaining wider application in metrology fields. They are often used as portable CMMs in different industry sectors. Because of the similarities between these camera systems and conventional CMMs in dimensional measurements, the accuracies of these optical systems are normally specified using the well-established methods for conventional CMMs. However, the analytical and experimental results introduced in ths paper show that the current accuracy specification methods are not well representing the accuracy of these camera systems. They show quite different field performance than conventional CMMs, due to the systems' specific characteristics. As a possible solution, in the latter part of this paper, a more comprehensive accuracy depicting method for these camera systems is suggested in order to give closer-to-fact specification.