Spoof detection by ultrasonic subdermal probe
First Claim
1. A method of determining whether an object is alive, comprising:
- providing an ultrasonic sensor having a substantially planar piezoelectric transmit-layer, an ultrasonic receiver array having a plurality of receivers, and a platen;
causing the transmit layer to produce an ultrasound plane-wave traveling toward an object residing on the platen, the object having an outer surface and internal parts;
using the ultrasonic receiver, detecting ultrasonic energy that has been reflected from the object;
analyzing the detected ultrasonic energy to provide an analysis result;
comparing the analysis result to a template;
determining whether the analysis result and the template are similar; and
declaring that the object is alive if the analysis result is determined to be similar to the template.
2 Assignments
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.
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Citations
30 Claims
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1. A method of determining whether an object is alive, comprising:
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providing an ultrasonic sensor having a substantially planar piezoelectric transmit-layer, an ultrasonic receiver array having a plurality of receivers, and a platen; causing the transmit layer to produce an ultrasound plane-wave traveling toward an object residing on the platen, the object having an outer surface and internal parts; using the ultrasonic receiver, detecting ultrasonic energy that has been reflected from the object; analyzing the detected ultrasonic energy to provide an analysis result; comparing the analysis result to a template; determining whether the analysis result and the template are similar; and declaring that the object is alive if the analysis result is determined to be similar to the template. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for determining whether an object is alive, comprising:
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an ultrasonic sensor having a substantially planar piezoelectric transmit-layer, an ultrasonic receiver array having a plurality of receivers, and a platen; and a computer in communication with the ultrasonic sensor and programmed to; cause the transmit layer to produce a plane-wave traveling toward an object residing on the platen, the object having an outer surface and internal parts; analyze reflected ultrasonic energy that has been detected by the ultrasonic receiver to provide an analysis result; compare the analysis result to a template; determine whether the analysis result and the template are similar; and declare that the object is alive if the analysis result is determined to be similar to the template. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A system for determining whether an object is alive, comprising:
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a means for producing an ultrasound plane-wave traveling toward an object residing on a platen, the object having an outer surface and internal parts; a means for detecting ultrasonic energy that has been reflected from the object; a means for analyzing the detected ultrasonic energy to provide an analysis result; a means for comparing the analysis result to a template; a means for determining whether the analysis result and the template are similar; and a means for declaring that the object is alive if the analysis result is determined to be similar to the template. - View Dependent Claims (24, 25, 26)
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27. A non-transitory, computer-readable storage medium comprising one or more computer programs of computer readable instructions for execution by one or more processors in communication with an ultrasonic sensor having a substantially planar piezoelectric transmit-layer, an ultrasonic receiver array having a plurality of receivers, and a platen, the computer program(s) comprising instructions for:
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causing the transmit layer to produce an ultrasound plane-wave traveling toward an object residing on the platen, the object having an outer surface and internal parts; using the ultrasonic receiver, detecting ultrasonic energy that has been reflected from the object; analyzing the detected ultrasonic energy to provide an analysis result; comparing the analysis result to a template; determining whether the analysis result and the template are similar; and declaring that the object is alive if the analysis result is determined to be similar to the template. - View Dependent Claims (28, 29, 30)
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Specification