System for and method of securing fingerprint biometric systems against fake-finger spoofing

A spoof detection module comprising a computer readable medium having computer readable program logic recorded thereon for controlling a processor, the logic comprising:

• a metric calculator programmed to receive fingerprint image data and calculate a combination of multiple metrics;
• and
• classifier logic programmed to receive the multiple metrics and determine a spoof probability based on the combination of the multiple metrics, wherein the multiple metrics comprise any two or more of pixel gray level average and variance of pixels corresponding to a fingerprint ridge, pixel gray level average and variance of pixels corresponding to a fingerprint valley, density of sweat pores. density of streaks, and raw signal level.

A method of determining the similarity of a finger to human skin, comprising:

• capturing fingerprint image data;
• and
• determining a spoof probability that the finger is real based on a combination of metrics derived from the fingerprint image data, wherein the combination of metrics comprise any two or more of pixel gray level average and variance of pixels corresponding to a fingerprint ridge, pixel gray level average and variance of pixels corresponding to a fingerprint valley, density of sweat pores, density of streaks, and raw signal level.