Astrophysical image separation by blind time-frequency source separation methods

ÖZGEN M. T., Kuruoglu E. E., Herranz D.

DIGITAL SIGNAL PROCESSING, vol.19, no.2, pp.360-369, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 19 Issue: 2
  • Publication Date: 2009
  • Doi Number: 10.1016/j.dsp.2007.12.003
  • Journal Name: DIGITAL SIGNAL PROCESSING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.360-369
  • Keywords: Cosmic microwave background radiation, Astrophysical image separation, Source separation, Blind time-frequency source separation methods, Joint diagonalization, NONORTHOGONAL JOINT DIAGONALIZATION
  • Anadolu University Affiliated: Yes

Abstract

In this paper, two prevalent blind time-frequency (TF) source separation methods in the literature are adapted to astrophysical image mixtures and four algorithms are developed to separate them into their astrophysical components. The components considered in this work are cosmic microwave background (CMB) radiation, galactic dust and synchrotron, among which the CMB component is emphasized. These simulated components mixed via realistic coefficients are subjected to simulated additive, nonstationary Gaussian noise components of realistic power levels, to yield image mixtures on which our orthogonal and nonorthogonal TF algorithms are applied. The developed algorithms are compared with the FastICA algorithm and CMB component is found to be recovered with an improvement reaching to 3.25 decibels from CMB-synchrotron mixtures. The proposed techniques are believed to be generically applicable in separating other types of astrophysical components as well. (C) 2008 Elsevier Inc. All rights reserved.