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Filtering of high noise breast thermal images using fast non-local means
Published in ISA - Instrumentation, Systems, and Automation Society
2014
Pages: 328 - 335
Abstract
Analyses of breast thermograms are still a challenging task primarily due to the limitations such as low contrast, low signal to noise ratio and absence of clear edges. Therefore, always there is a requirement for preprocessing techniques before performing any quantitative analysis. In this work, a noise removal framework using fast non-local means algorithm, method noise and median filter was used to denoise breast thermograms. The images considered were subjected to Anscombe transformation to convert the distribution from Poisson to Gaussian. The pre-denoised image was obtained by subjecting the transformed image to fast non-local means filtering. The method noise which is the difference between the original and predenoised image was observed with the noise component merged in few structures and fine detail of the image. The image details presented in the method noise was extracted by smoothing the noise part using the median filter. The retrieved image part was added to the pre-denoised image to obtain the final denoised image. The performance of this technique was compared with that of Wiener and SUSAN filters. The results show that all the filters considered are able to remove the noise component. The performance of the proposed denoising framework is found to be good in preserving detail and removing noise. Further, the method noise is observed with negligible image details. Similarly, denoised image with no noise and smoothed edges are observed using Wiener filter and its method noise is contained with few structures and image details. The performance results of SUSAN filter is found to be blurred denoised image with little noise and also method noise with extensive structure and image details. Hence, it appears that the proposed denoising framework is able to preserve the edge information and generate clear image that could help in enhancing the diagnostic relevance of breast thermograms. In this paper, the introduction, objectives, materials and methods, results and discussion and conclusions are presented in detail. Copyright 2014, ISA All Rights Reserved.
About the journal
Journal51st Annual Rocky Mountain Bioengineering Symposium, RMBS 2014 and 51st International ISA Biomedical Sciences Instrumentation Symposium 2014
PublisherISA - Instrumentation, Systems, and Automation Society
Open AccessNo
Concepts (14)
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    MEDIAN FILTERS
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    Medical imaging
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    Poisson distribution
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    Temperature measuring instruments
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    Thermography (temperature measurement)
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    BREAST THERMOGRAMS
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    De-noising
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    LOW SIGNAL-TO-NOISE RATIO
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    METHOD NOISE
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    NOISE COMPONENTS
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    Non-local means
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    NON-LOCAL MEANS FILTERING
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    PREPROCESSING TECHNIQUES
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    Image denoising