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27 August 1999 Characterizing the illumination in an automated visual inspection work cell
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It is common practice to begin the design of an illumination-viewing sub-system for Machine Vision by experimentation: simply maneuvering the lamps and camera around until a high-contrast image has been obtained. There then follows the process of duplicating that lighting pattern in a rugged, well-engineered rig that will with- stand the rigours of the factory floor. This requires careful measurement, to obtain the same illumination angles. Two alternative approaches are suggested in this paper. In the first, an image is created in a hemispherical mirror, so that the lights appear as bright spots. By measuring the positions of these spots, the geometry of a lighting rig can be determined very quickly and easily. In the second approach, a video camera fitted with a fish-eye lens can be used to obtain a map that is then analyzed in a similar way. A third technique is described for characterizing the lighting when a large, diffusely reflecting object is to be examined. This is also able to provide sufficient data to enable a lighting pattern to be duplicated.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Bruce G. Batchelor "Characterizing the illumination in an automated visual inspection work cell", Proc. SPIE 3836, Machine Vision Systems for Inspection and Metrology VIII, (27 August 1999);


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