Toward Synthetic Physical Fingerprint Targets

Area of Science:

• Biometrics
• Sensor Technology
• Materials Science

Background:

• Biometric fingerprint identification relies heavily on sensor reliability.
• Challenges exist in calibrating and standardizing fingerprint sensors, affecting repeatability and data diversity.

Purpose of the Study:

• To propose and evaluate methodologies for fabricating synthetic 3D fingerprint targets (phantoms).
• To enable precise evaluation and validation of fingerprint sensors under controlled conditions.

Main Methods:

• Utilized laser engraving, 3D printing, and CNC machining with various materials.
• Assessed phantom fidelity, intra-class variability, and interoperability across manufacturing methods.

Main Results:

• Silicone-cast phantoms from laser engraving or CNC machining showed high accuracy for rolled fingerprints.
• Direct laser engraving on flat silicone targets is optimal for slap recordings.
• 3D printing with silicone filling is best for contactless fingerprint sensors.

Conclusions:

• Developed a method-independent comparison of phantom fabrication techniques.
• Identified optimal fabrication methods for different fingerprint sensor types (rolled, slap, contactless).
• Enhanced understanding of fingerprint recognition system validation and performance assessment.