A High Dynamic Range Acousto-Optic Image Correlator For Real-Time Pattern Recognition

Perry A. Money; K. Terry Stalker

doi:10.1117/12.976577

22 August 1988 A High Dynamic Range Acousto-Optic Image Correlator For Real-Time Pattern Recognition

Perry A. Money, K. Terry Stalker

Proceedings Volume 0938, Digital and Optical Shape Representation and Pattern Recognition; (1988) https://doi.org/10.1117/12.976577
Event: 1988 Technical Symposium on Optics, Electro-Optics, and Sensors, 1988, Orlando, FL, United States

Abstract

The architecture and experimental results for an incoherent acousto-optic image correlator suitable for real-time applications are presented. In the basic architecture, each time a line of the raster-scanned input image is fed into the acousto-optic device (AOD), all rows of a digitally stored reference image are read into the system using an array of light emitting diodes (LEDs). Thus, the required two-dimensional correlation is performed as a series of multi-channel 1-D time-integrations in x (performed in the AOD) combined with a multi-channel correlation in y (perpendicular to the AOD axis) using a modified CCD. The LED array and detector modifications which markedly increase the dynamic range are discussed as well as the correlator design. Further, a novel memory for storing the reference object is described for rapidly changing templates. Experimental results indicate the architecture is useful for applications in the areas of character recognition and target identification.

Citation Download Citation

Perry A. Money and K. Terry Stalker "A High Dynamic Range Acousto-Optic Image Correlator For Real-Time Pattern Recognition", Proc. SPIE 0938, Digital and Optical Shape Representation and Pattern Recognition, (22 August 1988); https://doi.org/10.1117/12.976577

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