Optical: systems and elements – Holographic system or element – Having particular recording medium
Patent
1989-09-07
1992-09-22
Bovernick, Rodney B.
Optical: systems and elements
Holographic system or element
Having particular recording medium
359 29, 359559, 359561, 364822, 382 31, G03H 116, G06G 900
Patent
active
051502291
ABSTRACT:
An optical correlator according to the present invention generates a cross-correlation peak of two patterns of pictorial information to be compared. It generates pictorial patterns of a sum of the two patterns of pictorial information and of a difference between the two patterns of pictorial information by a phase conjugate waveform, transforms the pictorial patterns into first Fourier transform images, generates a pictorial pattern of a difference between an intensity distribution of the first Fourier transform images by the phase conjugate waveform, and transforms the pictorial pattern of a difference between an intensity distribution of the first Fourier transform images into second Fourier transform images. The optical correlator detects a cross-correlation peak of the two patterns of pictorial information for comparison at a high S/N ratio.
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Yeh et al, "Real-Time Optical Image Subtraction Using Dynamic Holographic Interference In Photorefractive Media," Optics Letters, vol. 13, No. 7, Jul. 1988, pp. 586-588.
Optical Engineering, May 1988, vol. 27, No. 5, "Nonlinear optical image subtraction for potential industrial applications", Chiou et al., pp. 385-392.
Mitsuoka Yasuyuki
Takesue Toshiharu
Adams Bruce L.
Bovernick Rodney B.
Lerner Martin
Seiko Instruments Inc.
Wilks Van C.
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