Patent ID: 8872908
Filing Date: 2014-10-28
Classification: G06K

Abstract:
1. A biometric system comprising: first illumination means for illuminating an object through an image region of a first facet of a multifaceted prism, wherein light from the first illumination means undergoes total internal reflectance at a second facet of the multifaceted prism prior to illuminating the object, and the image region is smaller than the first facet; second illumination means for illuminating the object through the second facet of the multifaceted prism; and first imaging means for imaging light scattered from the object and passing though the image region of the first facet at an angle less than the critical angle and undergoing total internal reflectance at the second facet, wherein the scattered light originates from both the first and second illumination means, and the critical angle is defined by an interface of the first facet with an external environment and is measured relative to the normal of the first facet.