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Titolo:
OPTIMAL IMAGE-RESTORATION WITH THE FRACTIONAL FOURIER-TRANSFORM
Autore:
KUTAY MA; OZAKTAS HM;
Indirizzi:
BILKENT UNIV,DEPT ELECT ENGN TR-06533 ANKARA TURKEY
Titolo Testata:
Journal of the Optical Society of America. A, Optics, image science,and vision.
fascicolo: 4, volume: 15, anno: 1998,
pagine: 825 - 833
SICI:
1084-7529(1998)15:4<825:OIWTFF>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
TIME-FREQUENCY DISTRIBUTIONS; OPTICAL IMPLEMENTATION; ORDER; PROPAGATION; WIGNER; DIFFRACTION; DOMAINS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
M.A. Kutay e H.M. Ozaktas, "OPTIMAL IMAGE-RESTORATION WITH THE FRACTIONAL FOURIER-TRANSFORM", Journal of the Optical Society of America. A, Optics, image science,and vision., 15(4), 1998, pp. 825-833

Abstract

The classical Wiener filter, which can be implemented in O(N log N) time, is suited best for space-invariant degradation models and space-invariant signal and noise characteristics. For space-varying degradations and nonstationary processes, however, the optimal linear estimate requires O(N-2) time for implementation. Optimal filtering in fractional Fourier domains permits reduction of the error compared with ordinary Fourier domain Wiener filtering for certain types of degradation and noise while requiring only O(N log N) implementation time. The amount of reduction in error depends on the signal and noise statistics as well as on the degradation model. The largest improvements are typically obtained for chirplike degradations and noise, but other types of degradation and noise may also benefit substantially from the method (e.g., nonconstant velocity motion blur and degradation by inhomogeneousatmospheric turbulence). In any event, these reductions are achieved at no additional cost. (C) 1998 Optical Society of America.

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Documento generato il 08/04/20 alle ore 07:07:51