27 December 1990 Rotation-invariant, time-integrating optical correlation recognition system
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Abstract
The speed at which one or more targets can be recognized in a time-sequencing rotation-invariant binary phase-only filter (BPOF) optical recognition system can be improved significantly by integrating sequential correlation responses and using the integrated peak responses as inputs to the same statistical correlation plane filter (CPF) used for individual sequential correlation responses. Since commercially available BPOFs can be written at very high frame rates (350 frames per second), more than 10 correlation responses can be integrated during the frame time of an output camera operating at video rates. Therefore, the use of of integrated rather than individual sequential correlation responses reduces the processing time by a factor of 10 or more if the same standard video rate camera is used at the correlation plane. This paper presents results obtained using a prototype time-integrating BPOF correlator to achieve near real-time rotation-invariant recognition of both single and multiple targets in a noisy and cluttered input scene.
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Thomas R. Walsh, Gary W. Carhart, Bret F. Draayer, Paul A. Billings, Michael K. Giles, "Rotation-invariant, time-integrating optical correlation recognition system", Proc. SPIE 1347, Optical Information Processing Systems and Architectures II, (27 December 1990); doi: 10.1117/12.23415; https://doi.org/10.1117/12.23415
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