LENS INCLINATION DUE TO INSTABLE FIXINGS DETECTED AND VERIFIED WITH VDI / VDE 2634 PART 1

The automotive industry increasingly uses close ran ge photogrammetry systems with bundle adjustment fo r acquiring 3D information to check for example the quality of she et metal parts. Because of its flexibility, at time s a photogrammetric system is used in climate chambers and hence is exposed to ex treme strain. The interior orientation of the camer a whilst capturing in the difficult environment can not be assumed to be stab le nd an appearance of wear may occur over time. T his paper presents the effect of unstable lens fixings. A practical adaptation fo r reducing the lens movement, whereby the commonly used ring flash is dissociated from the lens, is introduced and successfully teste d. Also, a mathematical model to compensate the eff ct of lens inclination is presented and verified by the German guideline VDI/ E 2634 Part 1. First results show significant imp rovement in maximum length variation, which is the desired parameter in the guideline VDI/VDE 2634 part 1.