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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 2 — Jan. 19, 2009
  • pp: 733–746

Interval type-II fuzzy anisotropic diffusion algorithm for speckle noise reduction in optical coherence tomography images

Prabakar Puvanathasan and Kostadinka Bizheva  »View Author Affiliations

Optics Express, Vol. 17, Issue 2, pp. 733-746 (2009)

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A novel, speckle noise reduction algorithm based on the combination of Anisotropic Diffusion (AD) filtering and Interval Type-II fuzzy sets was developed for reducing speckle noise in Optical Coherence Tomography (OCT) images. Unlike regular AD, the new Type-II fuzzy AD algorithm considers the uncertainty in the calculated diffusion coefficient and appropriate adjustments to the coefficient are made. The new algorithm offers flexibility in optimizing the trade-off between two of the image metrics: signal-to-noise (SNR) and Edginess, which are directly related to the structure of the imaged object. Application of the Type-II fuzzy AD algorithm to OCT tomograms acquired in-vivo from a human finger tip and human retina show reduction in the speckle noise with very little edge blurring and about 13 dB and 7 dB image SNR improvement respectively. Comparison with Wiener, Adaptive Lee and regular AD filters, applied to the same images, demonstrates the superior performance of the Type-II fuzzy AD algorithm in terms image SNR and edge preservation metrics improvement.

© 2009 Optical Society of America

OCIS Codes
(030.6140) Coherence and statistical optics : Speckle
(100.0100) Image processing : Image processing
(100.2980) Image processing : Image enhancement
(170.4500) Medical optics and biotechnology : Optical coherence tomography
(100.3008) Image processing : Image recognition, algorithms and filters

ToC Category:
Image Processing

Original Manuscript: October 29, 2008
Revised Manuscript: December 23, 2008
Manuscript Accepted: January 6, 2009
Published: January 8, 2009

Virtual Issues
Vol. 4, Iss. 3 Virtual Journal for Biomedical Optics

Prabakar Puvanathasan and Kostadinka Bizheva, "Interval type-II fuzzy anisotropic diffusion algorithm for speckle noise reduction in optical coherence tomography images," Opt. Express 17, 733-746 (2009)

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