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The elasticity of the iris subjects the shape and degree of circularity of the pupil to variations. For example, the pupil's border may slightly wobble and alter in shape within the iris during changes in pupil size and eye-movements, which can be problematic for
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The iris may also temporarily deform due to forces evoked during acceleration or deceleration of the eye ball. The iris deforms strongest in the pupillary region (near the pupil-iris border) where the iris is most elastic.
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border) is less elastic and thus more robust to movement forces. As such, eye-trackers may improve the accuracy of gaze tracking by relying on peripheral iris features rather than the pupillary border. An open-source
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2015 12th
International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)
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307:"Post-saccadic oscillations in eye movement data recorded with pupil-based eye trackers reflect motion of the pupil inside the iris"
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Proceedings of the
Biometric Consortium 2011 Conference: Gaithersburg, MD: National Institute of Standards and Technology; 2011
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which base their gaze estimation on the center mass of the pupil border. The outer, ciliary region (close to the iris-
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Clark, AD; Kulp, SA; Herron, IH; Ross, AA (2011). "Exploring the nonlinear dynamics of iris deformation".
113:"Irissometry: Effects of Pupil Size on Iris Elasticity Measured With Video-Based Feature Tracking"
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Wei, Z; Tan, T; Sun, Z (2007). "Nonlinear Iris
Deformation Correction Based on Gaussian Model".
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Songjang, T; Thainimit, S (2015). "Tracking and modeling human iris surface deformation".
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181:. Lecture Notes in Computer Science. Vol. 4642. pp. 780–789.
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Studying deformations of the iris as pupil size varies is relevant to
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214:"A 'minimum-wear-and-tear'meshwork for the iris"
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68:-based irissometry code is available on
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111:Strauch, C; Naber, M (2022).
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403:GitHub (December 18, 2021).
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179:Advances in Biometrics
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