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Optical hit–miss morphological transform

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Abstract

We present an optical correlator implementation of the morphological hit–miss transform. This provides improved recognition of objects in clutter compared with standard optical pattern-recognition correlator techniques. The hit–miss transform is modified to use rank-order filtering since this gives better performance in noise and clutter. By varying the correlation plane threshold, we can perform dilations, rank-order filters, and erosions on the same multifunctional coherent optical correlator system. We quantify the thresholds required for generic object part recognition and provide simulated and optical laboratory data.

© 1992 Optical Society of America

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