LIVENESS AND SPOOF DETECTION FOR ULTRASONIC FINGERPRINT SENSORS
First Claim
1. A method of detecting a spoof finger by an ultrasonic fingerprint sensor, comprising:
- transmitting, by an ultrasonic transmitter of the ultrasonic fingerprint sensor, an ultrasonic wave to a finger;
receiving, by an ultrasonic sensor array of the ultrasonic fingerprint sensor, a reflected ultrasonic wave from the finger;
determining, by a controller of the ultrasonic fingerprint sensor, a reflected acoustic energy of the finger based on a difference between average amplitudes of the reflected ultrasonic wave from ridges and valleys of the finger; and
determining, by the controller of the ultrasonic fingerprint sensor, whether the finger is a spoof based at least in part on the reflected acoustic energy of the finger.
1 Assignment
0 Petitions
Accused Products
Abstract
Embodiments of apparatuses and methods for detecting a spoof finger are disclosed. In one embodiment, an ultrasonic fingerprint sensor comprises an ultrasonic transmitter configured to transmit an ultrasonic wave to a finger, an ultrasonic sensor array configured to receive a reflected ultrasonic wave from the finger, and a controller configured to determine a reflected acoustic energy of the finger based on a difference between average amplitudes of the reflected ultrasonic wave from ridges and valleys of the finger; and determine whether the finger is a spoof based at least in part on the reflected acoustic energy of the finger.
105 Citations
30 Claims
-
1. A method of detecting a spoof finger by an ultrasonic fingerprint sensor, comprising:
-
transmitting, by an ultrasonic transmitter of the ultrasonic fingerprint sensor, an ultrasonic wave to a finger; receiving, by an ultrasonic sensor array of the ultrasonic fingerprint sensor, a reflected ultrasonic wave from the finger; determining, by a controller of the ultrasonic fingerprint sensor, a reflected acoustic energy of the finger based on a difference between average amplitudes of the reflected ultrasonic wave from ridges and valleys of the finger; and determining, by the controller of the ultrasonic fingerprint sensor, whether the finger is a spoof based at least in part on the reflected acoustic energy of the finger. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. An ultrasonic fingerprint sensor, comprising:
-
an ultrasonic transmitter configured to transmit an ultrasonic wave to a finger; an ultrasonic sensor array configured to receive a reflected ultrasonic wave from the finger; and a controller configured to determine a reflected acoustic energy of the finger based on a difference between average amplitudes of the reflected ultrasonic wave from ridges and valleys of the finger; and
determine whether the finger is a spoof based at least in part on the reflected acoustic energy of the finger. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. An ultrasonic fingerprint sensor, comprising:
-
transmitter means for transmitting an ultrasonic wave to a finger; receiver means for receiving a reflected ultrasonic wave from the finger; and controller means for determining a reflected acoustic energy of the finger based on a difference between average amplitudes of the reflected ultrasonic wave from ridges and valleys of the finger, and determining whether the finger is a spoof based at least in part on the reflected acoustic energy of the finger. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
-
-
30. A non-transitory medium storing instructions for execution by one or more processors, the instructions comprising:
-
instructions for transmitting, by an ultrasonic transmitter of the ultrasonic fingerprint sensor, an ultrasonic wave to a finger; instructions for receiving, by an ultrasonic sensor array of the ultrasonic fingerprint sensor, a reflected ultrasonic wave from the finger; instructions for determining, by a controller of the ultrasonic fingerprint sensor, a reflected acoustic energy of the finger based on a difference between average amplitudes of the reflected ultrasonic wave from ridges and valleys of the finger; and instructions for determining, by the controller of the ultrasonic fingerprint sensor, whether the finger is a spoof based at least in part on the reflected acoustic energy of the finger.
-
Specification