Spoof and liveness detection via pyroelectric indications

An apparatus, comprising:

• an ultrasonic sensor system that includes piezoelectric material and a platen;
• and
• a control system, at least part of the control system being configured for electrical communication with the ultrasonic sensor system, the control system being further configured for:
• determining that a target object is proximate the platen of the ultrasonic sensor system;
• controlling the ultrasonic sensor system to obtain N frames of ultrasonic image data, wherein N is an integer;
• determining at least one target object pyroelectric indication based, at least in part, on the N frames of ultrasonic image data;
• retrieving at least one stored pyroelectric indication from a memory;
• performing a pyroelectric indication comparison between the target object pyroelectric indication and at least one stored pyroelectric indication;
• and
• determining whether the target object is a digit of a living person or a spoof based, at least in part, on the pyroelectric indication comparison.

One or more non-transitory media having software stored thereon, the software including instructions for controlling one or more devices to perform a method of liveness detection, the method comprising:

• determining that a target object is proximate a platen of an ultrasonic sensor system that includes piezoelectric material;
• controlling the ultrasonic sensor system to obtain N frames of ultrasonic image data, wherein N is an integer;
• determining at least one target object pyroelectric indication based, at least in part, on the N frames of ultrasonic image data;
• retrieving at least one stored pyroelectric indication from a memory;
• performing a pyroelectric indication comparison between the target object pyroelectric indication and at least one stored pyroelectric indication;
• and
• determining whether the target object is a digit of a living person or a spoof based, at least in part, on the pyroelectric indication comparison.

An apparatus, comprising:

• an ultrasonic sensor system that includes piezoelectric material and a platen;
• and
• control means for electrical communication with the ultrasonic sensor system, the control system further comprising means for:
• determining that a target object is proximate a platen of an ultrasonic sensor system that includes piezoelectric material;
• controlling the ultrasonic sensor system to obtain N frames of ultrasonic image data, wherein N is an integer;
• determining at least one target object pyroelectric indication based, at least in part, on the N frames of ultrasonic image data;
• retrieving at least one stored pyroelectric indication from a memory;
• performing a pyroelectric indication comparison between the target object pyroelectric indication and at least one stored pyroelectric indication;
• and
• determining whether the target object is a digit of a living person or a spoof based, at least in part, on the pyroelectric indication comparison.