Image analysis – Pattern recognition – Template matching
Patent
1997-10-31
2000-02-01
Kelley, Christopher S.
Image analysis
Pattern recognition
Template matching
359237, G06K 974
Patent
active
060212233
ABSTRACT:
An image H(x, y) for displaying a target image G(x, y) is displayed on a liquid-crystal display panel and illumination light from an illumination light source is made to pass therethrough to form an image on a PALSLM. Read light h.nu. is radiated to the PALSLM and a phase-modulated light image .alpha.(x, y) read out of the PALSLM is subjected to Fourier transform by a lens. A phase contrast filter gives a predetermined phase shift to only the zero-order light component of Fourier light image .alpha..sub.f (x, y). The phase-shifted light image is subjected to inverse Fourier transform by a lens to project an output image O(x, y) to an output plane. A light image O'(x, y) branched by a beam sampler is picked up by a pickup device and an evaluation value calculating unit evaluates conformity between the image O(x, y) and the image G(x, y). A control unit performs feedback control of optical characteristics of the illumination light source, PALSLM, and phase contrast filter, based on the evaluation result.
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J. Gluckstad, "Phase Contrast Image Synthesis", Optics Communications, vol. 130, No. 4, Oct. 1, 1996, pp. 225-230.
J. Gluckstad, "Adaptive Array Illumination and Structured Light Generated by Spatial Zero-Order Self-Phase Modulation in a Kerr Medium" Optics Communications 120 (1995) pp. 194-203.
J. Gluckstad, "Phase Contrast Image Synthesis" Optics Communications 130 (1996) pp. 225-230.
"Spatial Light Modulator and Optical Analog Arithmetics", OplusE, Mar. 1995, No. 184, Published by Shin Gijyutsu Communications Kabushiki Kaisha.
Imai et al, "Phase Modulation Characteristics of Twisted Nematic Liquid Crystal Panel with Circularly Polarized Light" Imaging Science and Engineering Laboratory, Tokyo Institute of Technology, Received Mar. 30, 1992.
Proceedings, SPIE--The International Society for Optical Engineering, Nov. 4-5 1996, pp. 109-114 vol. 2885.
Gluckstad Jesper
Toyoda Haruyoshi
Hamamatsu Photonics K.K.
Kelley Christopher S.
Riso National Laboratory
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