23 March 1998 Fourier plane detectors for optical image processing
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Two specialized silicon photo-diode detector arrays and supporting electronics have been developed for use in the Fourier plane of a coherent optical image processor. Each detector array has geometrical characteristics tailored for extraction of specific image features. The first detector performs angular measurement of in-plane rotation of simple objects to an accuracy of better than one degree. This detector is being integrated into a system to measure the attitude of missiles in flight. The second detector uses the well-known ring-wedge geometry to measure edge angles and power spectra in the Fourier plane. This detector and supporting neural network software forms a powerful automatic target recognition system. Both detectors are capable of processing images at rates exceeding one thousand frames per second. We describe systems that process NTSC or VGA video images at 60 frames per second.
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Keith B. Farr, Richard L. Hartman, "Fourier plane detectors for optical image processing", Proc. SPIE 3386, Optical Pattern Recognition IX, (23 March 1998); doi: 10.1117/12.304752; https://doi.org/10.1117/12.304752

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