Differential Fourier analysis of speckle correlation fringes

Rajagopalan Umamaheswari, N. Takai, T. Asakura

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A method consisting of the median filtering and the differential Fourier analysis is proposed to analyze the speckle correlation fringes. In the method, these two operations act effectively as a band-pass filter since the speckle noise with high frequencies is suppressed by the median filtering and the pedestal variation with low frequency is removed through the differentiation of fringe signals. In computer simulations, the performance of the method is compared with that based on the ordinary Fourier analysis and examined with respect to the window size of median filters used. It is revealed that speckled fringes with the low visibility can be successfully analyzed with high accuracy. The validity of the method is also experimentally shown by applying it to the analysis of speckle correlation fringes obtained in speckle photography.

Original languageEnglish
Article number001
Pages (from-to)193-200
Number of pages8
JournalJournal of Optics
Volume19
Issue number5-6
DOIs
Publication statusPublished - 1988 Dec 1
Externally publishedYes

Fingerprint

Fourier analysis
Speckle
low visibility
photography
bandpass filters
Median filters
Photography
computerized simulation
Bandpass filters
Visibility
low frequencies
filters
Computer simulation

Keywords

  • Differential fourier analysis
  • Median filter
  • Speckle correlation fringes
  • Specle photography

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Differential Fourier analysis of speckle correlation fringes. / Umamaheswari, Rajagopalan; Takai, N.; Asakura, T.

In: Journal of Optics, Vol. 19, No. 5-6, 001, 01.12.1988, p. 193-200.

Research output: Contribution to journalArticle

Umamaheswari, Rajagopalan ; Takai, N. ; Asakura, T. / Differential Fourier analysis of speckle correlation fringes. In: Journal of Optics. 1988 ; Vol. 19, No. 5-6. pp. 193-200.
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