Accession Number : ADA189553

Title :   Computer Generated Hologram and Magneto-Optic Spatial Light Modulator for Optical Pattern Recognition.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Mayo, Michael W

PDF Url : ADA189553

Report Date : Dec 1987

Pagination or Media Count : 99

Abstract : This thesis investigates the integration of an optical system for real-time position, scale, and rotation invariant pattern recognition. Specifically a Litton Magneto-Optic Spatial Light Modulator is interfaced to a Zenith 248 microcomputer and AT&T frame grabber. A user interfaces written in C allowed arbitrary patterns to be written to the SLM by a user. Patterns can be generated in computer code, transferred form a CCD camera (via the frame grabber), taken from an image file on computer disk, or taken from a VAX image file. The ability to locally generate a computer generated hologram using the computer generated interferogram method on the Sun workstations and Imagen laser printer was developed. The CGH developed was used in an optical coordinate transformation to create a position, scale, and rotation invariant feature space. CCD cameras were used throughout the optical processor for display/analysis. The entire system was developed and tested using various templates and real scenes.

Descriptors :   *HOLOGRAMS, *LIGHT MODULATORS, *MAGNETOOPTICS, *OPTICAL PROCESSING, *PATTERN RECOGNITION, CAMERAS, COMPUTER PROGRAMS, COORDINATES, DISKS, INTERFACES, INTERFEROGRAMS, INVARIANCE, OPTICAL EQUIPMENT, POSITION(LOCATION), PRINTING EQUIPMENT, REAL TIME, ROTATION, SPATIAL DISTRIBUTION, TEMPLATES, TRANSFORMATIONS, USER NEEDS, THESES, CHARGE COUPLED DEVICES, MATCHED FILTERS, MICROCOMPUTERS, COMPUTER PROGRAMS

Subject Categories : Cybernetics
      Computer Programming and Software
      Holography

Distribution Statement : APPROVED FOR PUBLIC RELEASE