Detecting Optic Disc on Asians by Multiscale Gaussian Filtering
The optic disc (OD) is an important anatomical feature in retinal images, and its detection is vital for developing automated screening programs. Currently, there is no algorithm designed to automatically detect the OD in fundus images captured from Asians which are larger and have thicker vessels c...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | International Journal of Biomedical Imaging |
| Online Access: | http://dx.doi.org/10.1155/2012/727154 |
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| author | Bob Zhang Jane You Fakhri Karray |
| author_facet | Bob Zhang Jane You Fakhri Karray |
| author_sort | Bob Zhang |
| collection | DOAJ |
| description | The optic disc (OD) is an important anatomical feature in retinal images, and its detection is vital for developing automated screening programs. Currently, there is no algorithm designed to automatically detect the OD in fundus images captured from Asians which are larger and have thicker vessels compared to Caucasians. In this paper, we propose such a method to complement current algorithms using two steps: OD vessel candidate detection and OD vessel candidate matching. The first step is achieved with multiscale Gaussian filtering, scale production, and double thresholding to initially extract the vessels' directional map of various thicknesses. The map is then thinned before another threshold is applied to remove pixels with low intensities. This result forms the OD vessel candidates. In the second step, a Vessels' Directional Matched Filter (VDMF) of various dimensions is applied to the candidates to be matched, and the pixel with the smallest difference designated the OD center. We tested the proposed method on a new database consisting of 402 images from a diabetic retinopathy (DR) screening programme consisting of Asians. The OD center was successfully detected with an accuracy of 99.25% (399/402). |
| format | Article |
| id | doaj-art-dfe6616354f54a66b77150e1a2801b8c |
| institution | Kabale University |
| issn | 1687-4188 1687-4196 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Biomedical Imaging |
| spelling | doaj-art-dfe6616354f54a66b77150e1a2801b8c2025-02-03T01:00:48ZengWileyInternational Journal of Biomedical Imaging1687-41881687-41962012-01-01201210.1155/2012/727154727154Detecting Optic Disc on Asians by Multiscale Gaussian FilteringBob Zhang0Jane You1Fakhri Karray2Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON, N2L 3G1, CanadaBiometric Research Center, and Department of Computing, Hong Kong Polytechnic University, Hong KongDepartment of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON, N2L 3G1, CanadaThe optic disc (OD) is an important anatomical feature in retinal images, and its detection is vital for developing automated screening programs. Currently, there is no algorithm designed to automatically detect the OD in fundus images captured from Asians which are larger and have thicker vessels compared to Caucasians. In this paper, we propose such a method to complement current algorithms using two steps: OD vessel candidate detection and OD vessel candidate matching. The first step is achieved with multiscale Gaussian filtering, scale production, and double thresholding to initially extract the vessels' directional map of various thicknesses. The map is then thinned before another threshold is applied to remove pixels with low intensities. This result forms the OD vessel candidates. In the second step, a Vessels' Directional Matched Filter (VDMF) of various dimensions is applied to the candidates to be matched, and the pixel with the smallest difference designated the OD center. We tested the proposed method on a new database consisting of 402 images from a diabetic retinopathy (DR) screening programme consisting of Asians. The OD center was successfully detected with an accuracy of 99.25% (399/402).http://dx.doi.org/10.1155/2012/727154 |
| spellingShingle | Bob Zhang Jane You Fakhri Karray Detecting Optic Disc on Asians by Multiscale Gaussian Filtering International Journal of Biomedical Imaging |
| title | Detecting Optic Disc on Asians by Multiscale Gaussian Filtering |
| title_full | Detecting Optic Disc on Asians by Multiscale Gaussian Filtering |
| title_fullStr | Detecting Optic Disc on Asians by Multiscale Gaussian Filtering |
| title_full_unstemmed | Detecting Optic Disc on Asians by Multiscale Gaussian Filtering |
| title_short | Detecting Optic Disc on Asians by Multiscale Gaussian Filtering |
| title_sort | detecting optic disc on asians by multiscale gaussian filtering |
| url | http://dx.doi.org/10.1155/2012/727154 |
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