Methods, systems and computer program products (“software”) enable a virtual three-dimensional visual experience (referred to herein as “V3D”) in videoconferencing and other applications; the capturing, processing and displaying of images and image streams; and generation of a facial signature based on images of a given human user's or subject's face, or lace and head, for accurate, reliable identification or authentication of a human user or subject, in a secure, difficult to forge manner.