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In recent years identification of persons has gained major importance within the world from its applications, like border security, access control and forensic. Iris recognition is one amongst the foremost booming biometric modalities because of its unique character as a biometric feature, iris identification and verification systems became one among the most accurate biometric modality. During this paper, the different steps to acknowledge an iris image which incorporates acquisition, segmentation, normalization, feature extraction and matching are discussed. The performance of the iris recognition system depends on segmentation and normalization techniques adopted before extracting the iris features. It also provides an in depth review of the numerous methods of iris recognition systems. Additionally to the current, the challenges and achievements of the iris are presented.
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