Method and apparatus for pattern recognition and display with op

Details Method and apparatus for pattern recognition and display with op Method and apparatus for pattern recognition and display with op

1992-01-29

1993-10-26

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 11, 382 42, 359561, G06K 976

Patent

active

052573222

ABSTRACT:
A pattern recognition method and apparatus wherein an optical correlator and a feedback light path are provided. In the optical correlator, an input pattern whose image is formed on a first spatial light modulator (valve) is read by the irradiation of coherent light, and an image of a correlation peak image of this reading light is formed by the use of a correlation filter on which a plurality of reference patterns are recorded in the form of modified patterns. In the feedback light path, the correlation peak image is formed on a second spatial light modulator (valve), the correlation peak image is read out by the irradiation of coherent light, and the light having read the correlation image is made to pass a display filter on which display reference patterns are recorded. Further, an optical system is provided for feeding back the coherent light to the optical correlator after the coherent light having passed the display filter is once formed, thereby reading the correlation peak image by a light intensity measuring device. Moreover, there is disclosed a pattern displaying method and apparatus wherein the feedback light from the feedback light path is formed on a displaying member.

REFERENCES:
patent: 4961615 (1990-10-01), Owechko et al.
Projection synthetic discriminant function performance; Optical Engineering; Nov./Dec. 1984, vol. 23 No. 6.
Optical associative memory using Fourier transform holograms; Optical Engineering; May 1987, vol. 26 No. 5.

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