Speckle noise reduction in OCT and projection images using hybrid wavelet thresholding

X. Sui, H. Ishikawa, I. W. Selesnick, G. Wollstein, J. S. Schuman

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Speckle noise in optical coherence tomography (OCT) images is a granular noise that inherently exists and degrades the image quality. The challenge of conventional denoising methods is to distinguish the informational pattern from the speckle noise. In this paper we present a novel method for speckle noise reduction in OCT volumes, where the corresponding en face representation, which produces frontal sections of retinal layers and is relatively free of speckle, is considered as a reference. The proposed method estimates the anatomical structures by solving a constrained optimization problem that combines wavelet-domain sparsity and total variation (wavelet-TV) regularization to preserve the edges of retinal layers and to alleviate artifacts introduced by pure wavelet thresholding. Denoising performance is evaluated through the signal to noise ratio (SNR) and the contrast to noise ratio (CNR). The volumes processed by the proposed method show notable reduction of speckle without losing details in both en face and cross-sectional images.

Original languageEnglish (US)
Title of host publication2018 IEEE Signal Processing in Medicine and Biology Symposium, SPMB 2018 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538659168
DOIs
StatePublished - Jan 16 2019
Event2018 IEEE Signal Processing in Medicine and Biology Symposium, SPMB 2018 - Philadelphia, United States
Duration: Dec 1 2018 → …

Publication series

Name2018 IEEE Signal Processing in Medicine and Biology Symposium, SPMB 2018 - Proceedings

Conference

Conference2018 IEEE Signal Processing in Medicine and Biology Symposium, SPMB 2018
CountryUnited States
CityPhiladelphia
Period12/1/18 → …

ASJC Scopus subject areas

  • Signal Processing
  • Health Informatics

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    Sui, X., Ishikawa, H., Selesnick, I. W., Wollstein, G., & Schuman, J. S. (2019). Speckle noise reduction in OCT and projection images using hybrid wavelet thresholding. In 2018 IEEE Signal Processing in Medicine and Biology Symposium, SPMB 2018 - Proceedings [8615623] (2018 IEEE Signal Processing in Medicine and Biology Symposium, SPMB 2018 - Proceedings). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/SPMB.2018.8615623