| 摘要 |
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. |
| 主权项 |
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. |
