Iris surface deformation and normalization

Human iris recognition systems are an attractive form of non-intrusive bio-identification with many potential applications. However, the accuracy of these systems is still limited due to challenges presented by iris surface deformation. This paper provides an introduction to the physiology of the iris, describes the problem of iris deformation, and presents a review of past and current software approaches to iris recognition. The focus is on methods related to the physiology of the iris.