Directional wavelet based features for colonic polyp classification
•We test several wavelet based approaches for the classification of colon polyps.•A total of 11 differernt endoscopic polyp databases is used for our experiments.•The best results are achieved by extracting Weibull features from the subbands.•We propose three wavelet based feature extraction approac...
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| Veröffentlicht in: | Medical image analysis Jg. 31; S. 16 - 36 |
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Elsevier B.V
01.07.2016
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| ISSN: | 1361-8415, 1361-8423, 1361-8423 |
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| Abstract | •We test several wavelet based approaches for the classification of colon polyps.•A total of 11 differernt endoscopic polyp databases is used for our experiments.•The best results are achieved by extracting Weibull features from the subbands.•We propose three wavelet based feature extraction approaches using Weibull features.•Some of the methods improve the state of the art in classifying colonic polyps.
[Display omitted]
In this work, various wavelet based methods like the discrete wavelet transform, the dual-tree complex wavelet transform, the Gabor wavelet transform, curvelets, contourlets and shearlets are applied for the automated classification of colonic polyps. The methods are tested on 8 HD-endoscopic image databases, where each database is acquired using different imaging modalities (Pentax’s i-Scan technology combined with or without staining the mucosa), 2 NBI high-magnification databases and one database with chromoscopy high-magnification images.
To evaluate the suitability of the wavelet based methods with respect to the classification of colonic polyps, the classification performances of 3 wavelet transforms and the more recent curvelets, contourlets and shearlets are compared using a common framework. Wavelet transforms were already often and successfully applied to the classification of colonic polyps, whereas curvelets, contourlets and shearlets have not been used for this purpose so far.
We apply different feature extraction techniques to extract the information of the subbands of the wavelet based methods. Most of the in total 25 approaches were already published in different texture classification contexts. Thus, the aim is also to assess and compare their classification performance using a common framework. Three of the 25 approaches are novel. These three approaches extract Weibull features from the subbands of curvelets, contourlets and shearlets. Additionally, 5 state-of-the-art non wavelet based methods are applied to our databases so that we can compare their results with those of the wavelet based methods.
It turned out that extracting Weibull distribution parameters from the subband coefficients generally leads to high classification results, especially for the dual-tree complex wavelet transform, the Gabor wavelet transform and the Shearlet transform. These three wavelet based transforms in combination with Weibull features even outperform the state-of-the-art methods on most of the databases. We will also show that the Weibull distribution is better suited to model the subband coefficient distribution than other commonly used probability distributions like the Gaussian distribution and the generalized Gaussian distribution.
So this work gives a reasonable summary of wavelet based methods for colonic polyp classification and the huge amount of endoscopic polyp databases used for our experiments assures a high significance of the achieved results. |
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| AbstractList | In this work, various wavelet based methods like the discrete wavelet transform, the dual-tree complex wavelet transform, the Gabor wavelet transform, curvelets, contourlets and shearlets are applied for the automated classification of colonic polyps. The methods are tested on 8 HD-endoscopic image databases, where each database is acquired using different imaging modalities (Pentax's i-Scan technology combined with or without staining the mucosa), 2 NBI high-magnification databases and one database with chromoscopy high-magnification images. To evaluate the suitability of the wavelet based methods with respect to the classification of colonic polyps, the classification performances of 3 wavelet transforms and the more recent curvelets, contourlets and shearlets are compared using a common framework. Wavelet transforms were already often and successfully applied to the classification of colonic polyps, whereas curvelets, contourlets and shearlets have not been used for this purpose so far. We apply different feature extraction techniques to extract the information of the subbands of the wavelet based methods. Most of the in total 25 approaches were already published in different texture classification contexts. Thus, the aim is also to assess and compare their classification performance using a common framework. Three of the 25 approaches are novel. These three approaches extract Weibull features from the subbands of curvelets, contourlets and shearlets. Additionally, 5 state-of-the-art non wavelet based methods are applied to our databases so that we can compare their results with those of the wavelet based methods. It turned out that extracting Weibull distribution parameters from the subband coefficients generally leads to high classification results, especially for the dual-tree complex wavelet transform, the Gabor wavelet transform and the Shearlet transform. These three wavelet based transforms in combination with Weibull features even outperform the state-of-the-art methods on most of the databases. We will also show that the Weibull distribution is better suited to model the subband coefficient distribution than other commonly used probability distributions like the Gaussian distribution and the generalized Gaussian distribution. So this work gives a reasonable summary of wavelet based methods for colonic polyp classification and the huge amount of endoscopic polyp databases used for our experiments assures a high significance of the achieved results. In this work, various wavelet based methods like the discrete wavelet transform, the dual-tree complex wavelet transform, the Gabor wavelet transform, curvelets, contourlets and shearlets are applied for the automated classification of colonic polyps. The methods are tested on 8 HD-endoscopic image databases, where each database is acquired using different imaging modalities (Pentax's i-Scan technology combined with or without staining the mucosa), 2 NBI high-magnification databases and one database with chromoscopy high-magnification images. To evaluate the suitability of the wavelet based methods with respect to the classification of colonic polyps, the classification performances of 3 wavelet transforms and the more recent curvelets, contourlets and shearlets are compared using a common framework. Wavelet transforms were already often and successfully applied to the classification of colonic polyps, whereas curvelets, contourlets and shearlets have not been used for this purpose so far. We apply different feature extraction techniques to extract the information of the subbands of the wavelet based methods. Most of the in total 25 approaches were already published in different texture classification contexts. Thus, the aim is also to assess and compare their classification performance using a common framework. Three of the 25 approaches are novel. These three approaches extract Weibull features from the subbands of curvelets, contourlets and shearlets. Additionally, 5 state-of-the-art non wavelet based methods are applied to our databases so that we can compare their results with those of the wavelet based methods. It turned out that extracting Weibull distribution parameters from the subband coefficients generally leads to high classification results, especially for the dual-tree complex wavelet transform, the Gabor wavelet transform and the Shearlet transform. These three wavelet based transforms in combination with Weibull features even outperform the state-of-the-art methods on most of the databases. We will also show that the Weibull distribution is better suited to model the subband coefficient distribution than other commonly used probability distributions like the Gaussian distribution and the generalized Gaussian distribution. So this work gives a reasonable summary of wavelet based methods for colonic polyp classification and the huge amount of endoscopic polyp databases used for our experiments assures a high significance of the achieved results.In this work, various wavelet based methods like the discrete wavelet transform, the dual-tree complex wavelet transform, the Gabor wavelet transform, curvelets, contourlets and shearlets are applied for the automated classification of colonic polyps. The methods are tested on 8 HD-endoscopic image databases, where each database is acquired using different imaging modalities (Pentax's i-Scan technology combined with or without staining the mucosa), 2 NBI high-magnification databases and one database with chromoscopy high-magnification images. To evaluate the suitability of the wavelet based methods with respect to the classification of colonic polyps, the classification performances of 3 wavelet transforms and the more recent curvelets, contourlets and shearlets are compared using a common framework. Wavelet transforms were already often and successfully applied to the classification of colonic polyps, whereas curvelets, contourlets and shearlets have not been used for this purpose so far. We apply different feature extraction techniques to extract the information of the subbands of the wavelet based methods. Most of the in total 25 approaches were already published in different texture classification contexts. Thus, the aim is also to assess and compare their classification performance using a common framework. Three of the 25 approaches are novel. These three approaches extract Weibull features from the subbands of curvelets, contourlets and shearlets. Additionally, 5 state-of-the-art non wavelet based methods are applied to our databases so that we can compare their results with those of the wavelet based methods. It turned out that extracting Weibull distribution parameters from the subband coefficients generally leads to high classification results, especially for the dual-tree complex wavelet transform, the Gabor wavelet transform and the Shearlet transform. These three wavelet based transforms in combination with Weibull features even outperform the state-of-the-art methods on most of the databases. We will also show that the Weibull distribution is better suited to model the subband coefficient distribution than other commonly used probability distributions like the Gaussian distribution and the generalized Gaussian distribution. So this work gives a reasonable summary of wavelet based methods for colonic polyp classification and the huge amount of endoscopic polyp databases used for our experiments assures a high significance of the achieved results. •We test several wavelet based approaches for the classification of colon polyps.•A total of 11 differernt endoscopic polyp databases is used for our experiments.•The best results are achieved by extracting Weibull features from the subbands.•We propose three wavelet based feature extraction approaches using Weibull features.•Some of the methods improve the state of the art in classifying colonic polyps. [Display omitted] In this work, various wavelet based methods like the discrete wavelet transform, the dual-tree complex wavelet transform, the Gabor wavelet transform, curvelets, contourlets and shearlets are applied for the automated classification of colonic polyps. The methods are tested on 8 HD-endoscopic image databases, where each database is acquired using different imaging modalities (Pentax’s i-Scan technology combined with or without staining the mucosa), 2 NBI high-magnification databases and one database with chromoscopy high-magnification images. To evaluate the suitability of the wavelet based methods with respect to the classification of colonic polyps, the classification performances of 3 wavelet transforms and the more recent curvelets, contourlets and shearlets are compared using a common framework. Wavelet transforms were already often and successfully applied to the classification of colonic polyps, whereas curvelets, contourlets and shearlets have not been used for this purpose so far. We apply different feature extraction techniques to extract the information of the subbands of the wavelet based methods. Most of the in total 25 approaches were already published in different texture classification contexts. Thus, the aim is also to assess and compare their classification performance using a common framework. Three of the 25 approaches are novel. These three approaches extract Weibull features from the subbands of curvelets, contourlets and shearlets. Additionally, 5 state-of-the-art non wavelet based methods are applied to our databases so that we can compare their results with those of the wavelet based methods. It turned out that extracting Weibull distribution parameters from the subband coefficients generally leads to high classification results, especially for the dual-tree complex wavelet transform, the Gabor wavelet transform and the Shearlet transform. These three wavelet based transforms in combination with Weibull features even outperform the state-of-the-art methods on most of the databases. We will also show that the Weibull distribution is better suited to model the subband coefficient distribution than other commonly used probability distributions like the Gaussian distribution and the generalized Gaussian distribution. So this work gives a reasonable summary of wavelet based methods for colonic polyp classification and the huge amount of endoscopic polyp databases used for our experiments assures a high significance of the achieved results. |
| Author | Tamaki, Toru Tanaka, Shinji Tischendorf, J.J.W. Uhl, Andreas Wimmer, Georg Yoshida, Shigeto Häfner, Michael |
| Author_xml | – sequence: 1 givenname: Georg surname: Wimmer fullname: Wimmer, Georg email: gwimmer@cosy.sbg.ac.at organization: University of Salzburg, Department of Computer Sciences, Jakob Haringerstrasse 2, 5020 Salzburg, Austria – sequence: 2 givenname: Toru surname: Tamaki fullname: Tamaki, Toru organization: Hiroshima University, Department of Information Engineering, Graduate School of Engineering, 1-4-1 Kagamiyama, Higashi-hiroshima, Hiroshima 739-8527, Japan – sequence: 3 givenname: J.J.W. surname: Tischendorf fullname: Tischendorf, J.J.W. organization: Medical Department III (Gastroenterology, Hepatology and Metabolic Diseases), RWTH Aachen University Hospital, Paulwelsstr. 30, 52072 Aachen, Germany – sequence: 4 givenname: Michael surname: Häfner fullname: Häfner, Michael organization: St. Elisabeth Hospital, Landstraßer Hauptstraße 4a, A-1030 Vienna, Austria – sequence: 5 givenname: Shigeto surname: Yoshida fullname: Yoshida, Shigeto organization: Hiroshima University Hospital, Department of Endoscopy, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan – sequence: 6 givenname: Shinji surname: Tanaka fullname: Tanaka, Shinji organization: Hiroshima University Hospital, Department of Endoscopy, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan – sequence: 7 givenname: Andreas surname: Uhl fullname: Uhl, Andreas email: uhl@cosy.sbg.ac.at organization: University of Salzburg, Department of Computer Sciences, Jakob Haringerstrasse 2, 5020 Salzburg, Austria |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/26948110$$D View this record in MEDLINE/PubMed |
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| Keywords | Wavelet Contourlet Curvelet Polyp classification Shearlet |
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| Snippet | •We test several wavelet based approaches for the classification of colon polyps.•A total of 11 differernt endoscopic polyp databases is used for our... In this work, various wavelet based methods like the discrete wavelet transform, the dual-tree complex wavelet transform, the Gabor wavelet transform,... |
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| SubjectTerms | Algorithms Colonic Polyps - classification Colonic Polyps - diagnostic imaging Colonoscopy - methods Contourlet Curvelet Humans Image Enhancement Image Interpretation, Computer-Assisted Machine Learning Pattern Recognition, Automated - methods Polyp classification Reproducibility of Results Sensitivity and Specificity Shearlet Wavelet Wavelet Analysis |
| Title | Directional wavelet based features for colonic polyp classification |
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