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Class Information
Number: 382/210
Name: Image analysis > Pattern recognition > Template matching (e.g., specific devices that determine the best match) > Spatial filtering (e.g., holography)
Description: Subject matter in which an optical image of each pattern* to be recognized is transformed into a light amplitude distribution that is proportional to the two-dimensional Fourier transform of the pattern* image, and a spatial filter located in the transform plane modifies selected Fourier components of the resulting Fourier spectrum.










Sub-classes under this class:

Class Number Class Name Patents
382/211 With electrically controlled light modulator or filter 77


Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
5974178 Wavesource image visualization method using a partial division fast fourier transform Oct. 26, 1999
5970168 Fourier filtering mechanism for inspecting wafers Oct. 19, 1999
5940537 Method and system for compensating for geometric distortion of images Aug. 17, 1999
5933546 Method and apparatus for multi-resolution image searching Aug. 3, 1999
5915034 Pattern collation apparatus based on spatial frequency characteristics Jun. 22, 1999
5903390 Two port nonlinear joint transform correlator May. 11, 1999
5896489 Electrophotographic printer Apr. 20, 1999
5878151 Moving object tracking Mar. 2, 1999
5862258 Method for distinguishing between objects using mace filters Jan. 19, 1999
5862247 Personal and property identification system Jan. 19, 1999
5841907 Spatial integrating optical correlator for verifying the authenticity of a person, product or thing Nov. 24, 1998
5822466 Method and means of spatial filtering Oct. 13, 1998
5770854 Pattern-recognition computing and method for producing same Jun. 23, 1998
5754691 Normalization of data from holographic correlators May. 19, 1998
5754693 Method of optical recognition and classification of patterns May. 19, 1998
5740276 Holographic method for encrypting and decrypting information using a fingerprint Apr. 14, 1998
5694488 Method and apparatus for processing of reconstructed holographic images of digital data patterns Dec. 2, 1997
5692072 Edge detecting device Nov. 25, 1997
5671090 Methods and systems for analyzing data Sep. 23, 1997
5648872 Single lens joint transform correlator utilizing a fresnel zone plate signal Jul. 15, 1997
5619596 Method and apparatus for optical pattern recognition Apr. 8, 1997
5606435 Fiber optic-based correlating and sensing system Feb. 25, 1997
5572595 Method of detecting the location of a human being in three dimensions Nov. 5, 1996
5521985 Apparatus for recognizing machine generated or handprinted text May. 28, 1996
5493444 Photorefractive two-beam coupling nonlinear joint transform correlator Feb. 20, 1996
5485312 Optical pattern recognition system and method for verifying the authenticity of a person, product or thing Jan. 16, 1996
5479257 Method of and apparatus for detecting object position using a fourier transform of the object image and processing system using the same Dec. 26, 1995
5452137 Extenders for reflective optical path segments Sep. 19, 1995
5438440 Holographic code division multiple access Aug. 1, 1995
5367579 Method of removing spurious responses from optical joint transform correlators Nov. 22, 1994
5347375 Computer-assisted holographic image formation technique which determines interference pattern data used to form the holographic Sep. 13, 1994
5343415 Logarithmic polar coordinate transforming method, vision recognizing method, and optical information processing apparatus Aug. 30, 1994
5339305 Disk-based optical correlator and method Aug. 16, 1994
5317651 Non-linear and adaptive signal-processing device May. 31, 1994
5309523 Optical pattern recognition apparatus May. 3, 1994
5289299 Holographic code division multiple access Feb. 22, 1994
5274716 Optical pattern recognition apparatus Dec. 28, 1993
5235439 Volume-holographic inner product processor Aug. 10, 1993
5220622 Data base searching Jun. 15, 1993
5216541 Optical associative identifier with real time joint transform correlator Jun. 1, 1993
5216529 Holographic code division multiple access Jun. 1, 1993
5204770 All optical image processing and pattern recognition apparatus using stimulated photon echoes Apr. 20, 1993
5189482 Optical apparatus for fingerprint recognition system Feb. 23, 1993
5172000 Spatial filter for optically based defect inspection system Dec. 15, 1992
5159474 Transform optical processing system Oct. 27, 1992
5155606 Glint suppression technique Oct. 13, 1992
5151822 Transform digital/optical processing system including wedge/ring accumulator Sep. 29, 1992
5150229 Optical correlator Sep. 22, 1992
5144460 High contrast-resolution camera Sep. 1, 1992
5138468 Keyless holographic lock Aug. 11, 1992

1 2 3 4 5










 
 
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