Optimal Incoherent Filtering for Distortion-Invariant Image Recognition |
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| Authors: | Jianping Ding Masahide Itoh Toyohiko Yatagai |
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| Institution: | (1) Physics Department, Nanjing University, Nanjing, 210008, China;(2) Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305, Japan |
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| Abstract: | An optimal incoherent filter is proposed for distortion-invariant correlation. The optical transfer function (OTF) of the correlator is specified as a realizable phase-only term which is optimized by the simulated annealing algorithm. The phase-only OTF is used in image recognition to produce a sharp peak response and can be generated by dual-filter synthesis. Image recognition is achieved by subtracting two spatially incoherent correlation outputs produced from a positive and negative filters with an input image. Computer simulations show that the proposed correlator can yield a sharp correlation peak with excellent distortion tolerance.Presented at 1996 International Topical Meeting on Optical Computing (OC ‘96), April 21–25, Sendai, Japan |
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| Keywords: | image recognition optical transfer function incoherent optical correlator distortion-invariant correlation |
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