Trace of blood vessels in eye fundus image

Abstract

We are developing an health screening system for color eye fundus photography. The system is designed to detect the first signs of adult deseases. In this case, it is important to detect and trace blood vessels. This paper describes on a method of finding papillary disk by Hough transform and tracing from there blood vessels by a second order derivative Gaussian filter. The width of the blood vessel is obtained as the zero-crossing interval of the filter output. The filter is adjustable to the current width of the blood vessel being traced.