Biometrics is the technical term for body measurements and calculations. It refers to metrics related to human characteristics. Biometrics authentication (or realistic authentication) is used in computer science as a form of identification and access control. It is also used to identify individuals in groups that are under surveillance.

In the present book, fifteen typical literatures about biometric recognition published on international authoritative journals were selected to introduce the worldwide newest progress, which contains reviews or original researches on biometric functionality, multimodal biometric system, adaptive biometric systems, cancelable biometrics, soft biometrics, biometric authentication, etc. We hope this book can demonstrate advances in biometric recognition as well as give references to the researchers, students and other related people.