2.2 Image source

There are several databases of available retinal images. Most popular databases used for blood vessel segmentation approach and containing low-resolution images are the Digital Retinal Images for Optic Nerve Segmentation (DRIONS) Database [19], Structured Analysis of the Retina (STARE) [20], and Digital Retinal Images for Vessel Extraction (DRIVE) [21]. On the other hand, there are other databases such as MESSIDOR Digital Retinal Images (MESSIDOR) [22], Retinal Identification Database (RIDB) [23], Glaucoma Database (DB) [24], and high-resolution fundus (HRF) with higher resolutions [25]. In this chapter, we used images illustrated from the databases STARE and HRF.
