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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 7 — Mar. 29, 2010
  • pp: 7427–7439

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

Jae-Ho Han, Junghoon Lee, and Jin U. Kang  »View Author Affiliations

Optics Express, Vol. 18, Issue 7, pp. 7427-7439 (2010)

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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.

© 2010 OSA

OCIS Codes
(060.2350) Fiber optics and optical communications : Fiber optics imaging
(100.2980) Image processing : Image enhancement
(170.4500) Medical optics and biotechnology : Optical coherence tomography

ToC Category:
Image Processing

Original Manuscript: January 26, 2010
Revised Manuscript: March 16, 2010
Manuscript Accepted: March 19, 2010
Published: March 25, 2010

Virtual Issues
Vol. 5, Iss. 7 Virtual Journal for Biomedical Optics

Jae-Ho Han, Junghoon Lee, and Jin U. Kang, "Pixelation effect removal from fiber bundle probe based optical coherence tomography imaging," Opt. Express 18, 7427-7439 (2010)

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