PART I BIOMETRICS 1 Biometrics Principles and Important Concerns 3 (Khalid Saeed) 2 Face Recognition in Unconstrained Environment 21 (Przemyslaw Kocjan and Khalid Saeed) 3 Iris Pattern Recognition with a New Mathematical Model to Its Rotation Detection 43 (Krzysztof Misztal, Emil Saeed, Jacek Tabor, and Khalid Saeed) 4 Human Identification by Vascular Patterns 67…