This book showcases the technologies and algorithms being used for human authentication and recognition. Examining the full range of biometrics solutions, including unimodal and multimodal biometrics, the book covers conventional biometric techniques as well as novel systems developed over the past few years. It includes coverage of new biometric algorithms with novel feature extraction techniques, new computer vision approaches, soft computing approaches, and machine learning techniques under a unified framework used in biometrics systems. The text includes model question papers, mathematical notations, and exercises to reinforce understanding.