This authoritative text/reference presents acomprehensive review of algorithms and techniques for face recognition (FR),with an emphasis on systems that can be reliably used in operationalenvironments. Insights are provided by an international team of pre-eminentexperts into the processing of multispectral and hyperspectral face imagescaptured under uncontrolled environments. These discussions cover a variety ofimaging sensors ranging from state-of-the-art visible and infrared imagingsensors, to RGB-D and mobile phone image sensors. A range of differentbiometric modalities are also examined, including face, periocular and iris. Thistimely volume is a mine of useful information for researchers, practitionersand students involved in image processing, computer vision, biometrics andsecurity.