Optical pattern recognition apparatus

Details Optical pattern recognition apparatus Optical pattern recognition apparatus

1992-08-18

1994-05-03

Razavi, Michael T.

Image analysis

Histogram processing

For setting a threshold

382 43, 382 31, 382 32, 364822, 359561, G06F 15336, G06K 964

Patent

active

053095235

ABSTRACT:
In a joint transform correlator utilizing a spatial optic modulator, depending on the light intensity of each correlation peak obtained from optical correlation processing between at least one reference image and at least one input image, the light intensity passing through each reference image corresponding to each correlation peak is substantially adjusted so as to constitute a feedback system. By such construction, when processing a relatively large number of input or reference images, the correlator can avoid failure of recognition due to the reduction of light intensity of the correlation peaks and can avoid erroneous recognition to enable fast pattern recognition.

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T. Iwaki et al., "Optical pattern recognition with LAPS-SLM (II)/feedback joint transform correlator using LAPS-SLM", Proceedings of the SPIE Conference:Computer and Optically Formed Holographic Optics, vol. 1211, Jan. 15, 1990, pp. 284-295.

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