Automatic optic disc segmentation based on image brightness and contrast

Shijian Lu, Jiang Liu, Joo Hwee Lim, Zhuo Zhang, Ngan Meng Tan, Wing Kee Wong, Huiqi Li, Tien Yin Wong

Research output: Chapter in Book/Conference proceedingConference contributionpeer-review

3 Citations (Scopus)


Untreated glaucoma leads to permanent damage of the optic nerve and resultant visual field loss, which can progress to blindness. As glaucoma often produces additional pathological cupping of the optic disc (OD), cupdisc- ratio is one measure that is widely used for glaucoma diagnosis. This paper presents an OD localization method that automatically segments the OD and so can be applied for the cup-disc-ratio based glaucoma diagnosis. The proposed OD segmentation method is based on the observations that the OD is normally much brighter and at the same time have a smoother texture characteristics compared with other regions within retinal images. Given a retinal image we first capture the ODs smooth texture characteristic by a contrast image that is constructed based on the local maximum and minimum pixel lightness within a small neighborhood window. The centre of the OD can then be determined according to the density of the candidate OD pixels that are detected by retinal image pixels of the lowest contrast. After that, an OD region is approximately determined by a pair of morphological operations and the OD boundary is finally determined by an ellipse that is fitted by the convex hull of the detected OD region. Experiments over 71 retinal images of different qualities show that the OD region overlapping reaches up to 90.37% according to the OD boundary ellipses determined by our proposed method and the one manually plotted by an ophthalmologist.

Original languageEnglish
Title of host publicationMedical Imaging 2010
Subtitle of host publicationImage Processing
EditionPART 1
Publication statusPublished - 2010
Externally publishedYes
EventMedical Imaging 2010: Image Processing - San Diego, CA, United States
Duration: 14 Feb 201016 Feb 2010

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
NumberPART 1
ISSN (Print)1605-7422


ConferenceMedical Imaging 2010: Image Processing
Country/TerritoryUnited States
CitySan Diego, CA


  • computer-aided diagnosis
  • image brightness
  • image contrast
  • optic disc detection
  • optic disc segmentation
  • Retinal image analysis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging


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