Patent ID: 7508965
Filing Date: 2009-03-24
Classification: G06K

Abstract:
1. A combined multispectral and total-internal-reflectance biometric system, wherein the combined multispectral and total-internal-reflectance biometric system comprises: a platen having a plurality of facets, wherein at least one facet comprises a surface target facet; a first illumination source disposed to illuminate the surface target facet along a first illumination path that encounters the surface target facet at a first angle measured from a normal to the surface facet that is less than a critical angle, the critical angle defining a smallest angle measured from the normal at which light incident on the surface target facet substantially undergoes total-internal-reflectance; a second illumination source disposed to illuminate the surface target facet along a second illumination path that encounters the surface target facet at a second angle measured from the normal that is greater than the critical angle; and an imaging system comprising a first imaging location and a second imaging location; wherein: