Spoof detection by ultrasonic subdermal probe
First Claim
1. A method of indicating whether an object is part of a living being, the method comprising:
- with an ultrasonic sensor comprising a substantially planar piezoelectric transmit layer, an ultrasonic receiver array having a plurality of receivers, and a platen;
producing, via the transmit layer, an ultrasound plane wave traveling toward an object proximate the platen, the object having an outer surface and internal structures;
detecting, via the ultrasonic receiver, ultrasonic energy that has been reflected from the object;
analyzing the detected ultrasonic energy to provide an analysis result indicative of the outer surface and at least one of the internal structures;
indicating whether the object is part of a living being based, at least in part, on the analysis result.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods and systems of determining whether an object is alive, and therefore part of a live individual, are described. An object having an outer surface (e.g. a friction-ridge surface of a finger) and internal parts (e.g. tissue layer, papillae, blood vessels, fat, muscle, nail and bone) is scanned by a system having a transmitter, receiver and computer. One such system has a substantially planar piezoelectric transmit-layer, an ultrasonic receiver array having a plurality of receivers, and a platen. The transmit layer is caused to produce an ultrasound plane-wave traveling toward the object residing on the platen. Using the ultrasonic receiver, ultrasonic energy that has been reflected from the object is detected. The detected ultrasonic energy is analyzed to provide an analysis result, and the analysis result is compared to a template. A determination is made as to whether the analysis result and the template are similar, and the object is declared to be alive if the analysis result is determined to be similar to the template.
24 Citations
27 Claims
-
1. A method of indicating whether an object is part of a living being, the method comprising:
-
with an ultrasonic sensor comprising a substantially planar piezoelectric transmit layer, an ultrasonic receiver array having a plurality of receivers, and a platen; producing, via the transmit layer, an ultrasound plane wave traveling toward an object proximate the platen, the object having an outer surface and internal structures; detecting, via the ultrasonic receiver, ultrasonic energy that has been reflected from the object; analyzing the detected ultrasonic energy to provide an analysis result indicative of the outer surface and at least one of the internal structures; indicating whether the object is part of a living being based, at least in part, on the analysis result. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. An ultrasonic sensor system, comprising:
-
a substantially planar piezoelectric transmit layer; an ultrasonic receiver array having a plurality of receivers; a platen; and control electronics configured to; produce, via the transmit layer, an ultrasound plane wave traveling toward an object proximate the platen, the object having an outer surface and internal structures; detect, via the ultrasonic receiver, ultrasonic energy that has been reflected from the object; analyze the detected ultrasonic energy to provide an analysis result indicative of the outer surface and at least one of the internal structures; and indicate whether the object is part of a living being based, at least in part, on the analysis result. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
-
17. One or more non-transitory, computer-readable storage media having instructions stored thereon for performing a method of indicating whether an object is part of a living being, the method comprising:
with an ultrasonic sensor comprising a substantially planar piezoelectric transmit layer, an ultrasonic receiver array having a plurality of receivers, and a platen; producing, via the transmit layer, an ultrasound plane wave traveling toward an object proximate the platen, the object having an outer surface and internal structures; detecting, via the ultrasonic receiver, ultrasonic energy that has been reflected from the object; analyzing the detected ultrasonic energy to provide an analysis result indicative of the outer surface and at least one of the internal structures; indicating whether the object is part of a living being based, at least in part, on the analysis result. - View Dependent Claims (18, 19, 20)
-
21. An ultrasonic sensor system, comprising:
-
means for producing, via a transmit layer, an ultrasound plane wave traveling toward an object proximate a platen, the object having an outer surface and internal structures; means for detecting, via an ultrasonic receiver, ultrasonic energy that has been reflected from the object; means for analyzing the detected ultrasonic energy to provide an analysis result indicative of the outer surface and at least one of the internal structures; and means for indicating whether the object is part of a living being based, at least in part, on the analysis result. - View Dependent Claims (22, 23, 24, 25, 26, 27)
-
Specification