Segmentation of Blood Vessel Structures in Retinal Fundus Images with Logarithmic Gab or Filters

摘要

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 infoimation 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 m 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 pubhcly available un-age 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.