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International Journal of Biomedical Imaging
Volume 2015 (2015), Article ID 519024, 16 pages
Research Article

Automatic Extraction of Blood Vessels in the Retinal Vascular Tree Using Multiscale Medialness

1Faculty of Sciences, Electronics and Microelectronics Laboratory, Monastir University, 5019 Monastir, Tunisia
2Faculty of Computers and Information, Benha University, Benha 13511, Egypt
3Institute of Mines and Ales, Laboratory of Computer and Production Engineering, 30319 Alès, France
4Imaging Technology Center (CTIM), Las Palmas-Gran Canaria University, 35017 Las Palmas de Gran Canaria, Spain

Received 11 April 2014; Accepted 12 November 2014

Academic Editor: Karen Panetta

Copyright © 2015 Mariem Ben Abdallah et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We propose an algorithm for vessel extraction in retinal images. The first step consists of applying anisotropic diffusion filtering in the initial vessel network in order to restore disconnected vessel lines and eliminate noisy lines. In the second step, a multiscale line-tracking procedure allows detecting all vessels having similar dimensions at a chosen scale. Computing the individual image maps requires different steps. First, a number of points are preselected using the eigenvalues of the Hessian matrix. These points are expected to be near to a vessel axis. Then, for each preselected point, the response map is computed from gradient information of the image at the current scale. Finally, the multiscale image map is derived after combining the individual image maps at different scales (sizes). Two publicly available datasets have been used to test the performance of the suggested method. The main dataset is the STARE project’s dataset and the second one is the DRIVE dataset. The experimental results, applied on the STARE dataset, show a maximum accuracy average of around 94.02%. Also, when performed on the DRIVE database, the maximum accuracy average reaches 91.55%.