Zero-crossing interval correction in tracing eye-fundus blood vessels

This paper describes a method of finding the papilla by Hough transform, and from there tracing blood vessels by a second-order derivative Gaussian filter

Shinichi Tamura

2003

Key concepts

Scholarcy highlights

  • We are developing a health screening system for color eye-fundus photography
  • The system is designed to detect the first signs of adult diseases, for which purpose it is important to detect and trace eye blood vessels
  • This paper describes a method of finding the papilla by Hough transform, and from there tracing 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
  • Since the obtained zero-crossing interval is larger than the true width of an ideal step-wise blood vessel, it is corrected at each step

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