Optical: systems and elements – Diffraction – Using fourier transform spatial filtering
Patent
1989-07-21
1992-07-21
Bovernick, Rodney B.
Optical: systems and elements
Diffraction
Using fourier transform spatial filtering
359107, 364822, 382 42, 382 45, 382 46, 382 47, G02B 2742, G06E 300, G06K 932
Patent
active
051328429
ABSTRACT:
An optical system is provided for the transformation of input images to be correlated by a pattern recognition system. A pulse of light from a laser carries an input image to a beam splitter. The beam splitter divides the input pulse into an output pulse and a thoughput pulse that is directed through an optical ring resonator. The ring resonator is an optical reimaging system that transforms the input image in scale or orientation. The transformed version of the input image is then directed to the beam splitter where it is split into a modified output pulse and a modified throughput pulse that reenters the ring resonator. The transformation process is self-repeating to generate a series of successively modified output images that are equally spaced in time. The series of output images can be provided to an optical pattern recognition system for correlation with a stored reference. The generation of successive transformations of the input image precludes the necessity of storing a large library of reference images to be matched with the input image.
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Bovernick Rodney B.
McFarren John C.
Nguyen Thong
Rockwell International Corporation
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