Pressure-based activation of fingerprint spoof detection

A non-transitory computer readable storage medium having computer readable program code stored thereon for causing a computer system to perform method for operating a fingerprint sensor, the method comprising:

• capturing a first image of a fingerprint of a finger at a fingerprint sensor;
• capturing a second image of the fingerprint of the finger at the fingerprint sensor;
• determining whether a first force applied by the finger during capture of the second image is greater than a second force applied by the finger during capture of the first image;
• provided the second force is not greater than the first force, performing fingerprint authentication using at least one of the first image and the second image;
• and
• provided the second force is greater than the first force, performing a spoof detection operation to determine whether the finger is a real finger.

An electronic device comprising:

• a fingerprint sensor;
• a memory;
• and
• a processor configured to:
• capture an image of a fingerprint of a finger at a fingerprint sensor;
• determine a force applied by the finger at the fingerprint sensor, wherein the force is a measure of pressure applied by the finger on the fingerprint sensor during capture of the image;
• compare the force to a pressure threshold;
• provided the force satisfies the pressure threshold, perform a spoof detection operation to determine whether the finger is a real finger;
• and
• provided the force does not satisfy the pressure threshold, perform fingerprint authentication using the image of the fingerprint without performing the spoof detection operation.