Miniaturized optical biometric sensing
First Claim
1. A biometric access system comprising:
- a biometric sensor comprising;
an interface subsystem comprising an interface surface disposed to contact purported tissue of a subject;
an illumination subsystem disposed to pass source illumination into the purported tissue of a subject via a set of first surface regions of the purported tissue;
a detector subsystem disposed to acquire an image stack comprising a plurality of images, each image acquired from response illumination exiting a set of second surface regions of the purported tissue, the set of second surface regions being different from the set of first surface regions, the response illumination produced by interactions between the source illumination and subsurface characteristics of the purported tissue,such that the plurality of images comprises a first set of images acquired under a first optical imaging condition at each of a plurality of exposure times, and a second set of images acquired under a second optical imaging condition at each of the plurality of exposure times; and
a processor disposed to generate combined image data from a combination of the first and second sets of images, and to output a biometric determination relating to the purported tissue as a function of the combined image data.
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Accused Products
Abstract
Systems and methods are described for providing reliable biometric access control using an optical biometric sensor in a miniaturized form factor. Some implementations include multiple light sources that can illuminate skin or other tissue at multiple locations during a single measurement session. An imaging array can be arranged to form images of the light exiting the tissue only after undergoing diffuse reflectance in the tissue. Some implementations use the images to perform biometric functions. For example, the images can be used to identify an individual, verify identity of an individual, estimate demographic characteristics of an individual, etc. Such biometric functions can further be used to determine and affect access to secured assets.
32 Citations
20 Claims
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1. A biometric access system comprising:
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a biometric sensor comprising; an interface subsystem comprising an interface surface disposed to contact purported tissue of a subject; an illumination subsystem disposed to pass source illumination into the purported tissue of a subject via a set of first surface regions of the purported tissue; a detector subsystem disposed to acquire an image stack comprising a plurality of images, each image acquired from response illumination exiting a set of second surface regions of the purported tissue, the set of second surface regions being different from the set of first surface regions, the response illumination produced by interactions between the source illumination and subsurface characteristics of the purported tissue, such that the plurality of images comprises a first set of images acquired under a first optical imaging condition at each of a plurality of exposure times, and a second set of images acquired under a second optical imaging condition at each of the plurality of exposure times; and a processor disposed to generate combined image data from a combination of the first and second sets of images, and to output a biometric determination relating to the purported tissue as a function of the combined image data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification