A fusion denoising method based on homomorphic transform and 3D transform-domain collaborative filtering for laser speckle imaging of blood flow

Laser speckle contrast imaging (LSCI) is a real-time, full-field, non-contact optical imaging technique that has been widely used in blood flow imaging. However, its practical applications are limited due to its low signal-to-noise ratio (SNR) and low image contrast. In this study, a fusion denoisin...

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Bibliographic Details
Published inJournal of modern optics Vol. 69; no. 19; pp. 1103 - 1114
Main Authors Fu, Xuenian, Wu, Sijin, Si, Juanning, Li, Weixian
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 11.11.2022
Taylor & Francis Ltd
Subjects
Algorithms
block-matching and 3D transform-domain collaborative filtering
Blood flow
Filtration
homomorphic transform
Image contrast
Image enhancement
Imaging techniques
In vivo methods and tests
Laser speckle contrast imaging
Noise reduction
Reliability analysis
Signal to noise ratio
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Summary:Laser speckle contrast imaging (LSCI) is a real-time, full-field, non-contact optical imaging technique that has been widely used in blood flow imaging. However, its practical applications are limited due to its low signal-to-noise ratio (SNR) and low image contrast. In this study, a fusion denoising algorithm based on homomorphic transform and block-matching and 3D transform-domain collaborative filtering algorithm is proposed to reduce noise and improve image contrast. The reliability and applicability of the proposed method were evaluated by a phantom experiment and two in vivo experiments. The results show that the proposed algorithm can effectively remove the noise and enhance the image contrast. Consequently, the SNR is increased, the dynamic range of LSCI is expanded, and the estimation accuracy of blood flow is improved.
ISSN:0950-0340
1362-3044
DOI:10.1080/09500340.2022.2146224