Optical correlator simulation and experimental evaluation for three-dimensional parts

Robert W. Brandstetter; Nils J. Fonneland; Dara B. Blitz-Taskale

doi:10.1117/12.138312

Abstract

The performance of an optical correlator is analyzed as a vision system for a manufacturing robot. The correlator architecture is mathematically modeled and a simulation of the system is undertaken using representative airplane parts. Of particular interest in this study is the effect of three-dimensional part data on a two-dimensional correlation process. The model accounts for the apparent changes in part dimensions as a function of z-axis components, position in a parts tray, and the angular field of view of the vision system camera. The impact of these changes on the level of the correlation function and background discrimination is then assumed. Complementing the analytical model simulation, an actual optical correlator system is arranged to operate with parts placed at various locations in the physical tray area in order to obtain their corresponding levels. It was found that, by the introduction of multiple filters, the representative 3-D parts can be detected and tracked within the area of the tray, even when apparent part dimensions changed over the field of view of the imaging camera. The results of this research indicate that the correlator vision system concept shows promise for future 3-D manufacturing robotics applications.

Citation Download Citation

Robert W. Brandstetter, Nils J. Fonneland, and Dara B. Blitz-Taskale "Optical correlator simulation and experimental evaluation for three-dimensional parts", Proc. SPIE 1701, Optical Pattern Recognition III, (1 July 1992); doi: 10.1117/12.138312; https://doi.org/10.1117/12.138312

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