Biometrics technology continues to stride forward with its wider acceptance and its perceived need in various new security facets of modern society. Biometrics is being required to meet the growing challenges of identity management. While biometrics finds use in all diverse applications, the research challenges continue to grow as the user community expects a fully automatic system to cover the whole universal population with almost no errors. Recent advances in biometrics include new developments in sensors, modalities and algorithms. As new sensors are designed, newer challenges emerge in the algorithms for accurate recognition. New modalities have been discovered in addition to the fusion of existing modalities to improve accuracy and wider coverage. Written for researchers, advanced students and practitioners to use as a handbook, this volume captures the very latest state-of-the-art research contributions from leading international researchers in the field.