Optical associative identifier with real time joint transform correlator
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United States of America Patent
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Jun 1, 1993
Grant Date -
N/A
app pub date -
May 8, 1990
filing date -
May 9, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical associative identifier is disclosed which is used to determine the closest match between an image to be identified and a plurality of reference images. The identifier includes a display area for displaying the various images, the display area additionally functioning as a spatial light modulator. First and second optical Fourier transform devices are included which are used to compare the reference images to the image to be identified. The output light intensity of each of the reference images is modulated in accordance with a two-dimensional intensity distribution corresponding to the correlation between the image to be identified in each of the reference images. Based upon a comparison of these output light intensities, a match between the image to be identified and one of the reference images can be made.
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