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This authoritative collection introduces the reader to the state of the art in iris recognition technology. Topics and features: presents work from an international selection of preeminent researchers, reflecting the uses of iris recognition in many different social contexts; surveys previous developments in the field, and covers topics ranging from the low-level (e.g., physics of iris image acquisition) to the high level (e.g., alternative non-Daugman approaches to iris matching); introduces many active and open areas of research in iris recognition, including cross-wavelength matching and iris template aging. This book is an essential resource for anyone wishing to improve their understanding of iris recognition technology. This updated and enhanced new edition now contains material on pupil dynamics and liveness testing, the effects of medical conditions, template protection, and detecting textured contact lenses.