Accession Number : ADA202527


Title :   Superresolved Imaging Using the Hartley Transform and a Hemispherical Object Space


Descriptive Note : Master's thesis


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


Personal Author(s) : Kelly, Shawn L.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA202527


Report Date : DEC 1988


Pagination or Media Count : 46


Abstract : Resolution in an image can be increased by an iterative technique (introduced by Gerchberg) which effectively continues the known, partial spectrum beyond the limits imposed by an optical system. This increased resolution is called superresolution. Historically, an important constraint assumed for this technique was the knowledge of the finite dimensions of the object such that the object such that the object energy outside these dimensions must be zero. It is shown in this thesis that by a change of object space geometry, the semicircular field of view of an optical system provides a natural dimensional constraint which can be used instead of the object dimensions to achieve superresolution. A further modification of the iterative technique involves using the Fast Hartley Transform (FHT) instead of the Fast Fourier Transform (FFT). The FHT is inherently faster and requires less computer memory than the FFT. Theses.


Descriptors :   *FAST FOURIER TRANSFORMS , *COMPUTERS , *ENERGY , *ITERATIONS , *OPTICAL EQUIPMENT , *SPECTRA , MEMORY DEVICES , THESES


Subject Categories : COMPUTER PROGRAMMING AND SOFTWARE


Distribution Statement : APPROVED FOR PUBLIC RELEASE