Optical correlator using electronic image preprocessing

Details Optical correlator using electronic image preprocessing Optical correlator using electronic image preprocessing

1983-10-13

1987-01-13

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

35016213, 364822, 382 42, G06H 976

Patent

active

046370560

ABSTRACT:
An optical processing system uses spatial filtering to recognize two-dimensional functions and images. Images of real objects are captured with a television camera. The electronic signals representing the two-dimensional function or image are electronically preprocessed, such as by edge enhancement techniques or by applying a curvature function, and displayed on a narrow-band-phosphor cathode ray tube or television monitor. The monitor image is used directly as the input to an incoherent holographic correlator. Alternatively, the monitor image is used to modulate a source of coherent radiation such as a laser via a spatial light modulator to generate a modulated optical signal which is the input to a coherent holographic correlator. Analyzer circuitry with an optical detector at the correlation plane analyzes the shape of the correlation function to determine the intensity and position of its peak. The input to the CRT or monitor may also be in the form of non-optically generated electronic signals representative of a two-dimensional function for display in graphic form by the CRT or monitor.

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