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Mathematical Problems in Engineering
Volume 2016, Article ID 7906165, 15 pages
http://dx.doi.org/10.1155/2016/7906165
Research Article

An Automatic Cognitive Graph-Based Segmentation for Detection of Blood Vessels in Retinal Images

Masdar Institute of Science and Technology, Abu Dhabi, UAE

Received 28 February 2016; Revised 10 April 2016; Accepted 21 April 2016

Academic Editor: Daniel Zaldivar

Copyright © 2016 Rasha Al Shehhi 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.

Abstract

This paper presents a hierarchical graph-based segmentation for blood vessel detection in digital retinal images. This segmentation employs some of perceptual Gestalt principles: similarity, closure, continuity, and proximity to merge segments into coherent connected vessel-like patterns. The integration of Gestalt principles is based on object-based features (e.g., color and black top-hat (BTH) morphology and context) and graph-analysis algorithms (e.g., Dijkstra path). The segmentation framework consists of two main steps: preprocessing and multiscale graph-based segmentation. Preprocessing is to enhance lighting condition, due to low illumination contrast, and to construct necessary features to enhance vessel structure due to sensitivity of vessel patterns to multiscale/multiorientation structure. Graph-based segmentation is to decrease computational processing required for region of interest into most semantic objects. The segmentation was evaluated on three publicly available datasets. Experimental results show that preprocessing stage achieves better results compared to state-of-the-art enhancement methods. The performance of the proposed graph-based segmentation is found to be consistent and comparable to other existing methods, with improved capability of detecting small/thin vessels.