US 8,570,149 B2 · Biometric imaging using an optical adaptive interface

Abstract

Embodiments of the invention provide for a biometric system with an optically adaptive interface. In some embodiments, an optically adaptive interface changes optical characteristics in response to the placement of a finger on the optically adaptive interface. In some embodiments, the optically adaptive interface can include an active layer and a surface layer. The active layer and the surface layer can have different optical properties. For example, one layer may be opaque and the other transparent, the two layers may have complementary colors, the two layers may have orthogonal polarization reflectors, one layer may be reflective and the other absorptive, etc. Moreover, the active layer can be a fluid with either high or low viscosity. For example, the viscosity can be such that the active layer fluid is either completely displaced or not displaced in locations corresponding to finger valleys.

Claims21

Dependent claims

A biometric sensor comprising:

a platen;
an optically adaptive interface disposed on the platen comprising a contact state and a non-contact state, wherein in the non-contact state the optically adaptive interface is opaque and in the contact state a portion of the optically adaptive interface is substantially transparent;
an illumination subsystem configured to illuminate a skin site of a purported individual when placed on the optically adaptive interface when the optically adaptive interface is in the contact state;
and
an imaging subsystem configured to image the skin site when the optically adaptive interface is in the contact state.

2 more elements

Dependencies are inferred from the claim text.

Biometric imaging using an optical adaptive interface

Life of this patent

Biometric imaging using an optical adaptive interface

Life of this patent

Abstract

Claims21