Pixelation effect removal from fiber bundle probe based optical coherence tomography imaging

Jae Ho Han, Junghoon Lee, Jin U. Kang

Research output: Contribution to journalArticle

Abstract

A method of eliminating pixelization effect from en face optical coherence tomography (OCT) image when a fiber bundle is used as an OCT imaging probe is presented. We have demonstrated that applying a histogram equalization process before performing a weighted-averaged Gaussian smoothing filter to the original lower gray level intensity based image not only removes the structural artifact of the bundle but also enhances the image quality with minimum blurring of object's image features. The measured contrast-to-noise ratio (CNR) for an image of the US Air Force test target was 14.7dB (4.9dB), after (before) image processing. In addition, by performing the spatial frequency analysis based on two-dimensional discrete Fourier transform (2-D DFT), we were able to observe that the periodic intensity peaks induced by the regularly arrayed structure of the fiber bundle can be efficiently suppressed by 41.0dB for the first nearby side lobe as well as to obtain the precise physical spacing information of the fiber grid. The proposed combined method can also be used as a straight forward image processing tool for any imaging system utilizing fiber bundle as a high-resolution imager.

Original languageEnglish (US)
Pages (from-to)7427-7439
Number of pages13
JournalOptics Express
Volume18
Issue number7
StatePublished - Mar 29 2010

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bundles
tomography
fibers
probes
image processing
blurring
histograms
smoothing
lobes
artifacts
grids
spacing
filters
high resolution
air

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Pixelation effect removal from fiber bundle probe based optical coherence tomography imaging. / Han, Jae Ho; Lee, Junghoon; Kang, Jin U.

In: Optics Express, Vol. 18, No. 7, 29.03.2010, p. 7427-7439.

Research output: Contribution to journalArticle

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