An Unsupervised Approach for Eye Sclera Segmentation

  • Daniel Riccio
  • Nadia Brancati
  • Maria Frucci
  • Diego Gragnaniello
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 10657)


We present an unsupervised sclera segmentation method for eye color images. The proposed approach operates on a visible spectrum RGB eye image and does not require any prior knowledge such as eyelid or iris center coordinate detection. The eye color input image is enhanced by an adaptive histogram normalization to produce a gray level image in which the sclera is highlighted. A feature extraction process is involved both in the image binarization and in the computation of scores to assign to each connected components of the foreground. The binarization process is based on clustering and adaptive thresholding. Finally, the selection of foreground components identifying the sclera is performed on the analysis of the computed scores and of the positions between the foreground components. The proposed method was ranked \(2^{nd}\) in the Sclera Segmentation and Eye Recognition Benchmarking Competition (SSRBC 2017), providing satisfactory performance in terms of precision.


Sclera segmentation Gray level clustering Feature extraction 



We would like to thank Dr. Abhijit Das of the University of Sydney for his authorization to publish sample images from the dataset of SSRBC 2017.


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© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.University of Naples “Federico II”NaplesItaly
  2. 2.Institute for High Performance Computing and NetworkingNational Research Council of Italy (ICAR-CNR)NaplesItaly

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