Accession Number : ADA136223

Title :   A Comparison of Optical versus Hardware Fourier Transforms.

Descriptive Note : Final rept. 1 Jul-31 Oct 83,

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF PHYSICS

Personal Author(s) : Almeida,S P

PDF Url : ADA136223

Report Date : 31 Oct 1983

Pagination or Media Count : 29

Abstract : A comparison of the optical transform versus the hardware Fourier transform was made for two input functions: a rectangular aperture and a six-pointed star design. The optical transforms were modified using sharp and smooth lowpass as well as highpass filters. The results were compared against those obtained using the array processor hardware at the Brooks Air Force Base, School of Aerospace Medicine. The ringing observed in the lowpass filtered results of the array processor was simulated by the optical methods. However, certain asymmetric in the hardware ringing data were not observed optically. A discussion of the ringing and how to eliminate it is also presented. (Author)

Descriptors :   *Fourier transformation, *Optical processing, *Comparison, Input, Low pass filters, High pass filters, Apertures, Mathematical filters, Experimental data, Spatial filtering

Subject Categories : Numerical Mathematics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE