Optimum signal and image recovery by the method of alternating projections in fractional Fourier domains

SERBES A., Durak L.

COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION, cilt.15, sa.3, ss.675-689, 2010 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 15 Sayı: 3
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1016/j.cnsns.2009.05.013
  • Dergi Adı: COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.675-689
  • Anahtar Kelimeler: Method of alternating projections, Fractional Fourier transform, Signal recovery, Image recovery, Fractional Fourier transform order estimation, GENETIC ALGORITHMS, TRANSFORM, CONVOLUTION, SET
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

This paper presents a signal and image recovery scheme by the method of alternating projections onto convex sets in optimum fractional Fourier domains. It is shown that the fractional Fourier domain order with minimum bandwidth is the optimum fractional Fourier domain for the method employing alternating projections in signal recovery problems. Following the estimation of optimum fractional Fourier transform orders, incomplete signal is projected onto different convex sets consecutively to restore the missing part. Using a priori information in optimum fractional Fourier domains, superior results are obtained compared to the conventional Fourier domain restoration. The algorithm is tested on 1-D linear frequency modulated signals. real biological data and 2-D signals presenting chirp-type characteristics Better results are obtained in the matched fractional Fourier domain, compared to not only the conventional Fourier domain restoration, but also other fractional Fourier domains. (C) 2009 Elsevier B.V. All rights reserved.