Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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A New Ocular Torsion Measurement Method Using Iterative Optical Flow

  • Lee InBum (Interdisciplinary Program of Medical and Biological Engineering Major, Seoul Nat'l Univ.) ;
  • Choi ByungHun (Interdisciplinary Program of Medical and Biological Engineering Major, Seoul Nat'l Univ.) ;
  • Kim SangSik (SLMed.) ;
  • Park Kwang Suk (Department of Biomedical Engineering, College of Medicine, Seoul Nat'l Univ.)
  • Published : 2005.06.01
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Abstract

This paper presents a new method for measuring ocular torsion using the optical flow. Images of the iris were cropped and transformed into rectangular images that were orientation invariant. Feature points of the iris region were selected from a reference and a target image, and the shift of each feature was calculated using the iterative Lucas-Kanade method. The feature points were selected according to the strength of the corners on the iris image. The accuracy of the algorithm was tested using printed eye images. In these images, torsion was measured with $0.15^{\circ}$ precision. The proposed method shows robustness even with the gaze directional changes and pupillary reflex environment of real-time processing.

Keywords

References

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