MULTISPECTRAL EYE ANALYSIS FOR IDENTITY AUTHENTICATION

摘要

Certain aspects relate to systems and techniques for generating high resolution iris templates and for detecting spoofs, enabling more reliable and secure iris authentication. Pairs of RGB and NIR images can be captured by the iris authentication system for use in iris authentication, for example using an NIR LED flash and a four-channel image sensor. Multiple images of the user's iris can be captured by the system in a relatively short period of time and can be fused together to generate a high resolution iris image that can contain more detail of the iris structure and unique pattern than each individual images. The “liveness” of the iris, referring to whether the iris is a real human iris or an iris imitation, can be assessed via a liveness ratio based on comparison of known iris and sclera reflectance properties at various wavelengths to determined sensor responses at those same wavelengths.

主权项

1. A system for multispectral fake iris detection, the system comprising:
at least one image sensor configured for capture of image data of an eye of a user, the eye including an iris region and a sclera region, the image data including at least a near-infrared (NIR) channel and a red channel, the red channel representing visible red light; and a processor configured to:
determine image sensor responses corresponding to each of:
the iris region at the NIR channel,the sclera region at the NIR channel,the iris region at the red channel, andthe sclera region at the red channel;calculating an NIR intensity ratio based at least partly on the image sensor responses corresponding to the iris region at the NIR channel and the sclera region at the NIR channel,calculating a red intensity ratio based at least partly on the image sensor responses corresponding to the iris region at the red channel and the sclera region at the red channel, anddetermining whether the eye is human or fake based at least partly on the NIR intensity ratio and the red channel intensity ratio.