Accession Number : AD0724626

Title :   Sampling Functions and Their Effect in Optical Systems Evaluation,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF ENGINEERING SCIENCE OPERATIONS

Personal Author(s) : Parsons,John R.

Report Date : 18 DEC 1970

Pagination or Media Count : 95

Abstract : Sampling functions and their effects in computing quantities used to evaluate optical system performance are presented. Errors generated while one is digitally computing the point spread function (PS) and the transfer function (OTF) using Fourier Transforms, as well as methods for reducing these errors, are outlined. Sufficient pupil sample points must be provided to insure against inadequate pupil description or intolerable PS aliasing. The sampling function spectrum is used to indicate why the PS sample points must be close enough together and of sufficient number to satisfy the sampling theorem and eliminate truncation errors in the OTF. (Author)

Descriptors :   (*OPTICAL IMAGES, NUMERICAL ANALYSIS), DATA PROCESSING, FOURIER ANALYSIS, INTEGRAL TRANSFORMS, SAMPLING, OPTICAL PROPERTIES

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE