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Wavelet-based compression of medical images: Filter-bank selection and evaluation

Wavelet-based image coding algorithms (lossy and lossless) use a fixed perfect reconstruction filter-bank built into the algorithm for coding and decoding of images. However, no systematic study has been performed to evaluate the coding performance of wavelet filters on medical images. We evaluated...

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Main Authors: Saffor, A., Bin Ramli, A.R., Ng, K.H.
Format: Article
Published: Australasian Coll. of Phys. Scientists and Engineers 2003
Online Access:http://psasir.upm.edu.my/id/eprint/114985/
https://link.springer.com/article/10.1007/BF03178456?error=cookies_not_supported&code=bd8a29ea-159d-4ee3-8e7e-9c7cb3db6297
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spelling my.upm.eprints.1149852025-02-13T06:51:26Z http://psasir.upm.edu.my/id/eprint/114985/ Wavelet-based compression of medical images: Filter-bank selection and evaluation Saffor, A. Bin Ramli, A.R. Ng, K.H. Wavelet-based image coding algorithms (lossy and lossless) use a fixed perfect reconstruction filter-bank built into the algorithm for coding and decoding of images. However, no systematic study has been performed to evaluate the coding performance of wavelet filters on medical images. We evaluated the best types of filters suitable for medical images in providing low bit rate and low computational complexity. In this study a variety of wavelet filters are used to compress and decompress computed tomography (CT) brain and abdomen images. We applied two-dimensional wavelet decomposition, quantization and reconstruction using several families of filter banks to a set of CT images. Discreet Wavelet Transform (DWT), which provides efficient framework of multi-resolution frequency was used. Compression was accomplished by applying threshold values to the wavelet coefficients. The statistical indices such as mean square error (MSB), maximum absolute error (MAE) and peak signal-to-noise ratio (PSNR) were used to quantify the effect of wavelet compression of selected images. The code was written using the wavelet and image processing toolbox of the MATLAB (version 6.1). This results show that no specific wavelet filter performs uniformly better than others except for the case of Daubechies and bi-orthogonal filters which are the best among all. MAE values achieved by these filters were 5×1O14 to 12×1O14 for both CT brain and abdomen images at different decomposition levels. This indicated that using these filters a very small error (∼7 × 1014) can be achieved between original and the filtered image. The PSNR values obtained were higher for the brain than the abdomen images. For both the lossy and lossless compression, the 'most appropriate' wavelet filter should be chosen adaptively depending on the statistical properties of the image being coded to achieve higher compression ratio. Australasian Coll. of Phys. Scientists and Engineers 2003-06 Article PeerReviewed Saffor, A. and Bin Ramli, A.R. and Ng, K.H. (2003) Wavelet-based compression of medical images: Filter-bank selection and evaluation. Australasian Physical and Engineering Sciences in Medicine, 26 (2). pp. 39-44. ISSN 0158-9938; eISSN: 0158-9938 https://link.springer.com/article/10.1007/BF03178456?error=cookies_not_supported&code=bd8a29ea-159d-4ee3-8e7e-9c7cb3db6297 10.1007/bf03178456
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
description Wavelet-based image coding algorithms (lossy and lossless) use a fixed perfect reconstruction filter-bank built into the algorithm for coding and decoding of images. However, no systematic study has been performed to evaluate the coding performance of wavelet filters on medical images. We evaluated the best types of filters suitable for medical images in providing low bit rate and low computational complexity. In this study a variety of wavelet filters are used to compress and decompress computed tomography (CT) brain and abdomen images. We applied two-dimensional wavelet decomposition, quantization and reconstruction using several families of filter banks to a set of CT images. Discreet Wavelet Transform (DWT), which provides efficient framework of multi-resolution frequency was used. Compression was accomplished by applying threshold values to the wavelet coefficients. The statistical indices such as mean square error (MSB), maximum absolute error (MAE) and peak signal-to-noise ratio (PSNR) were used to quantify the effect of wavelet compression of selected images. The code was written using the wavelet and image processing toolbox of the MATLAB (version 6.1). This results show that no specific wavelet filter performs uniformly better than others except for the case of Daubechies and bi-orthogonal filters which are the best among all. MAE values achieved by these filters were 5×1O14 to 12×1O14 for both CT brain and abdomen images at different decomposition levels. This indicated that using these filters a very small error (∼7 × 1014) can be achieved between original and the filtered image. The PSNR values obtained were higher for the brain than the abdomen images. For both the lossy and lossless compression, the 'most appropriate' wavelet filter should be chosen adaptively depending on the statistical properties of the image being coded to achieve higher compression ratio.
format Article
author Saffor, A.
Bin Ramli, A.R.
Ng, K.H.
spellingShingle Saffor, A.
Bin Ramli, A.R.
Ng, K.H.
Wavelet-based compression of medical images: Filter-bank selection and evaluation
author_facet Saffor, A.
Bin Ramli, A.R.
Ng, K.H.
author_sort Saffor, A.
title Wavelet-based compression of medical images: Filter-bank selection and evaluation
title_short Wavelet-based compression of medical images: Filter-bank selection and evaluation
title_full Wavelet-based compression of medical images: Filter-bank selection and evaluation
title_fullStr Wavelet-based compression of medical images: Filter-bank selection and evaluation
title_full_unstemmed Wavelet-based compression of medical images: Filter-bank selection and evaluation
title_sort wavelet-based compression of medical images: filter-bank selection and evaluation
publisher Australasian Coll. of Phys. Scientists and Engineers
publishDate 2003
url http://psasir.upm.edu.my/id/eprint/114985/
https://link.springer.com/article/10.1007/BF03178456?error=cookies_not_supported&code=bd8a29ea-159d-4ee3-8e7e-9c7cb3db6297
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score 13.244413

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