A high dynamic range acousto-optic image correlator for real-time pattern recognition

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5178592

Molley, P A; Stalker, K T

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 (LED's). Thus, the required two-dimensional correltaion 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 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. 8 refs., 8 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5178592
• Report Number(s): SAND-88-0860C; CONF-880462-5; ON: DE88007933
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420800 -- Engineering-- Electronic Circuits & Devices-- (-1989)
440300* -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
DESIGN
EQUIPMENT
FOURIER TRANSFORMATION
INTEGRAL TRANSFORMATIONS
LIGHT EMITTING DIODES
OPTICAL EQUIPMENT
PATTERN RECOGNITION
REAL TIME SYSTEMS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
TRANSFORMATIONS