Contrast enhancement mammograms using denoising in wavelet coefficients

Conference proceedings article

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Publication Details

Author list: Kidsumran V., Chiracharit W.

Publisher: Hindawi

Publication year: 2013

Start page: 82

End page: 86

Number of pages: 5

ISBN: 9781479908066

ISSN: 0146-9428

eISSN: 1745-4557

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883340573&doi=10.1109%2fJCSSE.2013.6567324&partnerID=40&md5=a17f3daa4e0b5e2e0cc708fb1fd21c85

Languages: English-Great Britain (EN-GB)

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Abstract

Contrast enhancement in x-ray mammograms is important in improvement of radiologists' reading and interpretation. In many cases, it is difficult to discern signs of breast cancer because mammograms are low contrast and very noisy. This paper proposes improved contrast enhancement method in mammograms using denoising in wavelet coefficients. First, mammograms are decomposed by wavelet transform. Second, the ratio between approximate subband and detail subband as signal-to-noise ratio is computed. Finally, detail subbands which have the ratio lower than the criteria are boosted to improve mammograms contrast while detail subbands having the ratio higher than the criteria are set to zero for noise suppression in the same time. Contrast measure and peak-signal-to-noise ratio are used to evaluate the performance of the proposed method. The experimental results show higher contrast 17.05% than the conventional method while a bit different in peak-signal-to-noise ratio. ฉ 2013 IEEE.

Keywords

Contrast Improvement, Denoising, Mammograms, Wavelet Transform