The analysis of blood vessel structures in the retinal fundus images is important for the diagnosis of many diseases.
Vessel segmentation can assist in the detection of pathological changes which are possible indicators for arteriosclerosis,
retinopathy, micro aneurysms and macular degeneration.
In this article, two approaches to blood vessel segmentation are presented. Both of them are based on the evaluation of
phase symmetry information using complex logarithmic Gabor wavelets. In the first approach, a phase symmetry filter is
combined with the front propagation algorithm fast marching, the second method uses a hysteresis thresholding step.
The approaches have shown excellent results for the vessel segmentation on colon polyps. Although they were adapted to
structures in retinal fundus imaging, neither eye specific knowledge nor supervised classification methods are used. For
high comparability with previous publications in the field, the algorithms are evaluated on the two publicly available image
databases DRIVE and STARE. The hysteresis thresholding approach which performs slightly superior achieves an
average accuracy of 94.92% (sensitivity: 71.22%, specificity: 98.41%) for the DRIVE and 95, 65% (sensitivity: 71.87%,
specificity: 98.34%) for the STARE database.