Occlusions of a local region of the face with objects such as sunglasses, scarf, hands, and hair are generally called partial occlusions. Partial occlusions can, in theory, correspond to any occluding object. Generally, the occlusion has to be of less than 50% of the face to be considered a partial occlusion.
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(2009). Partial Occlusion. In: Li, S.Z., Jain, A. (eds) Encyclopedia of Biometrics. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-73003-5_331
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DOI: https://doi.org/10.1007/978-0-387-73003-5_331
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