Accession Number : AD0835646

Title :   OPTICAL FILTERING BY DIGITAL COMPUTER.

Descriptive Note : Interim technical rept.,

Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Pratt, W. K. ; Andrews, H. C.

Report Date : JUN 1968

Pagination or Media Count : 58

Abstract : Coherent optical processing operations can be performed on a digital computer since the Kirchhoff diffraction integral, describing the imaging process of a lens, can be expressed as a discrete two dimensional Fourier transform. The advantages of optical processing on a computer are increased accuracy and operational flexibility. Applications of computer optical processing described herein include the calculation of aperture diffraction patterns, spatial filtering for image noise reduction, character recognition, and holography. (Author)

Descriptors :   (*INTEGRAL TRANSFORMS, COMPUTER PROGRAMS), (*LENSES, INTEGRAL TRANSFORMS), OPTICAL FILTERS, DIGITAL COMPUTERS, OPTICAL IMAGES, DIFFRACTION, ALGORITHMS, COHERENT RADIATION, PHOTOGRAPHY, PATTERN RECOGNITION.

Subject Categories : Computer Programming and Software
      Computer Hardware
      Holography
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE