Improved DCT-Based Nonlocal Means Filter for MR Images Denoising
Joint Authors
Zhou, Jiliu
Zhang, Yi
Pu, Yi-Fei
Wu, Xi
Hu, Jin-Rong
Source
Computational and Mathematical Methods in Medicine
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-03-07
Country of Publication
Egypt
No. of Pages
14
Main Subjects
Abstract EN
The nonlocal means (NLM) filter has been proven to be an efficient feature-preserved denoising method and can be applied to remove noise in the magnetic resonance (MR) images.
To suppress noise more efficiently, we present a novel NLM filter based on the discrete cosine transform (DCT).
Instead of computing similarity weights using the gray level information directly, the proposed method calculates similarity weights in the DCT subspace of neighborhood.
Due to promising characteristics of DCT, such as low data correlation and high energy compaction, the proposed filter is naturally endowed with more accurate estimation of weights thus enhances denoising effectively.
The performance of the proposed filter is evaluated qualitatively and quantitatively together with two other NLM filters, namely, the original NLM filter and the unbiased NLM (UNLM) filter.
Experimental results demonstrate that the proposed filter achieves better denoising performance in MRI compared to the others.
American Psychological Association (APA)
Hu, Jin-Rong& Pu, Yi-Fei& Wu, Xi& Zhang, Yi& Zhou, Jiliu. 2012. Improved DCT-Based Nonlocal Means Filter for MR Images Denoising. Computational and Mathematical Methods in Medicine،Vol. 2012, no. 2012, pp.1-14.
https://search.emarefa.net/detail/BIM-455918
Modern Language Association (MLA)
Hu, Jin-Rong…[et al.]. Improved DCT-Based Nonlocal Means Filter for MR Images Denoising. Computational and Mathematical Methods in Medicine No. 2012 (2012), pp.1-14.
https://search.emarefa.net/detail/BIM-455918
American Medical Association (AMA)
Hu, Jin-Rong& Pu, Yi-Fei& Wu, Xi& Zhang, Yi& Zhou, Jiliu. Improved DCT-Based Nonlocal Means Filter for MR Images Denoising. Computational and Mathematical Methods in Medicine. 2012. Vol. 2012, no. 2012, pp.1-14.
https://search.emarefa.net/detail/BIM-455918
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-455918