Conference Proceeding

A Polar Map Based Approach Using Retinal Fundus Images for Glaucoma Detection

  • Akshaya Ramaswamy (Indian Institute of Technology Madras)
  • Keerthi Ram (Indian Institute of Technology Madras)
  • Niranjan Joshi (Indian Institute of Technology Madras)
  • Mohanasankar Sivaprakasam (Indian Institute of Technology Madras)


Cup-to-disc ratio is commonly used as an important parameter for glaucoma screening, involving segmentation of the optic cup on fundus images. We propose a novel polar map representation of the optic disc, using a combination of supervised and unsupervised cup segmentation techniques, for detection of glaucoma. Instead of performing hard thresholding on the segmentation output to extract the cup, we consider the cup confidence scores inside the disc to construct a polar map, and extract sector-wise features for learning a glaucoma risk probability (GRP) for the image. We compare the performance of GRP vis-à-vis the cup-to-disc ratio (CDR). On an evaluation dataset of 100 images from the publicly available RIM-ONE database, our method achieves 82% sensitivity at 84% specificity, and 96% sensitivity at 60% specificity (AUC of 0.8964). Experiments indicate that the polar map based method can provide a more discriminatory glaucoma risk probability score compared to CDR.

How to Cite:

Ramaswamy, A. & Ram, K. & Joshi, N. & Sivaprakasam, M., (2015) “A Polar Map Based Approach Using Retinal Fundus Images for Glaucoma Detection”, Proceedings of the Ophthalmic Medical Image Analysis International Workshop 2(2015), 145-152. doi:

Rights: Copyright © 2015 Akshaya Ramaswamy, Keerthi Ram, Niranjan Joshi, Mohanasankar Sivaprakasam

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Published on
09 Oct 2015
Peer Reviewed