Fingerprint Authentication Kevin Amendt David Friend April 26, 2006 - MIT Course 6.111 Project Presentations.

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Presentation transcript:

Fingerprint Authentication Kevin Amendt David Friend April 26, MIT Course Project Presentations

Authentication Nontransferable (possession based) Keycard Fingerprint Transferable (knowledge based) Password Certificate

Overview of System Two operation modes Add to database Validate a user

System Operation (Database Entry)

System Operation (Validation)

Validation The same fingerprint differs between images: Translation Rotation Scaling Noise

Validation How to match two fingerprint images? Two Methods: Feature Matching Pattern Matching

Feature Matching Locate specific characteristics of the fingerprint (minutiae), where ridges end or branch Match minutiae between images Considered the more accurate algorithm Usually implemented through software, and difficult to implement with digital logic

Pattern Matching Simple idea (maybe better for 6.111): overlay images and see if they match Problems… Noise: Set a threshold. If it’s “close” Translation: Use convolution Rotation: User training Scaling: Will consider this a noise problem

Conclusion Fingerprint ID Pattern matching validation Compute convolution sum and compare to threshold

How Convolution Works

Detailed Block Diagram