Page 744 - Introduction to Information Optics

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Optical character recognition (cant.} with photorefractive optics, 115
pattern classification, 394-395 angular and wavelength selectivities,
nearest neighbor classifiers, 395-398 122-125
optical implementation, 398-401 basic information, 115-118
with photorefractive optics, 401 Bragg diffraction limitation, 121 122
detection by phase conjugation, 401 404 shift-invariant limited correlators. 125
wavelength-multiplexed matched 132
filtering, 404-407 wave mixing and multiplexing, 118 121
wavelet matched filtering, 407-411 Optical signal-to-noise ratio (OSNR), 702
polychromatic pattern recognition, 375 704
with spatial-domain filters, 377-380 Optical spectrum analyzer (OSA), 695
with temporal Fourier-domain filters, Optical storage, 435-436
376 377 bit-pattern optical storage, 446 454
target tracking, 380 holographic, 454-461
autonomous tracking, 380-382 media, 438-446
data association tracking, 382-387 near field, 461-464
Optical processors, 476 upper limit of storage density, 436 438
Optical receivers, for fiber-optic Optical storage media
communication, 188-192 bacteriorhodopsin, 444
Optical scanning holography (OSH), 638- dichromated gelatin, 438
639 electron-trapping materials, 442-443
Optical shadow casting, for parallel optical magneto-optic materials, 445-446
logic, 479-480, 485 phase-change materials, 446
Optical signal processing photochemical hole burning, 444-445
algorithms for, 103 photochromic materials, 442
circular harmonic processing, 105-107 photographic film, 438
homomorphic processing, 107-108 photopolymers, 439-440
Mellin-transforrn processing, 104-105, photorefractive materials, 441 442
256 photoresists, 440
simulation annealing algorithm, 112-115 thermoplastic film, 440 441
synthetic discriminant algorithm, 108- two-photon-absorption materials, 443
111 444, 450
with coherent illumination, 75 Optical switches, 201-202, 247-248
Fourier transformation, 77-79 all-optical switches, 203-204
Fourier domain filter, 79-82, 83-84 etalon switching devices, 205-208
hybrid optical processor, 88-89 nonlinear directional coupler, 208-211
joint transform processor (JTP), 85-87 nonlinear interferometric switches, 211
spatial domain filter, 82-83 219
free space impulse response, 76-77 optical nonlinearity, 204-205
Fresnel-Kirchhoff theory, 76-77 fast electro-optic switches, 219-236
image processing figures of merit, 202-203
broadband signal processing, 98-103 microelectromechanical (MEMS), 236, 242
correlation detection, 89-92 deformable diffraction gratings, 242 244
image restoration, 93-97 electrostatic actuators, 238-242
image subtraction, 98, 137 MEMS fabrication, 237-238
with incoherent light, 74, 75 micromirror arrays, 244 245
color image presentation, 138-140 modulators, 219-220, 247-248
exploitation of coherence, 131-135 direct modulation of semiconductor
pseudocoloring, 140-141 lasers, 220-225
white light, 135-138 external electro-optic modulators, 225
with neural networks, 141-147 236