Robson, S; MacDonald, LW; Kyle, S; Shortis, M; (2015) Effect of illumination wavelength on optimizing multi-camera location systems in a factory environment. In: Proceedings of the Second International Conference on Sustainable Design and Manufacturing (SDM 2015). KES International: Seville, Spain.

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Abstract

As a model for a full-scale, factory-wide system, a system for dimensional measurement has been constructed using eight low-cost monochrome cameras with C-mount lenses on a rigid metal framework. The cameras were synchronised to capture simultaneous image sets, and photogrammetric software used to locate in each image the centroids of retroreflective targets on a 3D test object. The distortion parameters of the lens on each camera were estimated, and a target network constructed to a precision of better than 4.5 μm (at k=1), equivalent to a 1:220,000 discrimination range. Targets were illuminated by an annular LED ring attached to the front mounting ring of the lens of each camera, and the analysis was repeated for four different LED wavelengths.

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