Security and the authentication of individuals is necessary for many different areas of our lives, with most people having to authenticate their identity on a daily basis; examples include ATMs, secure access to buildings, and international travel. A biometric system provides automatic identification of an individual based on a unique feature or characteristic possessed by the individual. Iris recognition is regarded as the most reliable and accurate biometric identification system available. This book contains detailed information in developing an iris recognition system in order to verify both the uniqueness of the human iris and also its performance as a biometric. A typical iris recognition system includes iris imaging, iris detection, feature extraction and matching. The overall performance of an iris recognition system relies on the performance of its sub-systems. The qualities of all the sub-systems, altogether, define the performance of the system.