NDLI: CT image denoising using NLM and correlation-based wavelet packet thresholding

Content Provider	IET Digital Library
Author	Diwakar, Manoj Kumar, Manoj
Abstract	The impact of radiation dose is directly related to the quality of computed tomography (CT) images. Low-dose CT images are degraded with the noise and other factors. Noise reduction methods are very helpful to enhance the noisy CT images with a possibility to increase the signal-to-noise ratio (SNR) and have a scope for further reduction of radiation dose. In this study, a denoising scheme is proposed which is applicable only for two identical images with uncorrelated noise. In the proposed scheme, a non-local means (NLM) filter is used to denoise the first input image and a wavelet packet thresholding to denoise the second input image. Results of NLM filter are analysed and found excellent for noise suppression but missing the small structures of the input image. To recover that, the proposed scheme is using correlation-based wavelet packet thresholding. The final outcomes of the proposed scheme are excellent in terms of noise suppression and structure preservation. The proposed scheme is compared with existing methods and it is observed that performance of the proposed method is superior to existing methods in terms of visual quality, image quality index, peak SNR and entropy difference.
Starting Page	708
Ending Page	715
Page Count	8
ISSN	17519659
Volume Number	12
e-ISSN	17519667
Issue Number	Issue 5, May (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-ipr/12/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-ipr.2017.0639
Journal	IET Image Processing
Publisher Date	2018-01-11
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Biology And Medical Computing Biomedical Imaging/measurement Computed Tomography Image Computer Vision And Image Processing Technique Computerised Tomography Correlation-based Wavelet Packet Thresholding CT Image Denoising Entropy Difference Filtering Method in Signal Processing Function Theory And Analysis Image Denoising Image Enhancement Image Filtering Image Quality Index Integral Transforms Low-dose CT Image Medical Image Processing NLM Filter Noise Reduction Method Noise Suppression Nonlocal Mean Filter Optical, Image And Video Signal Processing Patient Diagnostic Method And Instrumentation Peak SNR Radiation Dose Reduction Radiography And Computed Tomography Signal to Noise Ratio Uncorrelated Noise Visual Quality Wavelet Packet Thresholding Wavelet Transform X-Ray Technique X-Rays And Particle Beam
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering Computer Vision and Pattern Recognition Software

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