Dual-imager biometric sensor

摘要

Embodiments disclose a two imager biometric sensor. In some embodiments, the two imagers can include a direct imager and a TIR imager. In some embodiments, multispectral light sources can be used to illuminate target tissue imaged by two imagers. In some embodiments, composite images can be created from images detected using both imagers.

主权项

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.