A4Vision technology enables the real-time capture of three-dimensional images of a subject's face. The unique features of the subject's cranio-facial structure are extracted and stored as a biometric template for automated human recognition. The method can be used either in identification or in verification.

1. Face Capture
Using structured light in near-infrared range:

  • The A4Vision camera projects an invisible structured light pattern onto the face
  • The light pattern is distorted by the surface geometry of the face
  • The camera precisely records the pattern distortion
2. 3D Reconstruction Process
Real-time reconstruction of the 3D facial surface:
  • The distorted pattern is input into a 3D reconstruction algorithm
  • A 3D mesh of the face is created by means of triangulation
  • The resulting face geometry is measurable in millimeters
  • The 3D reconstructed image is NOT stored in the database
3. Feature Extraction and Matching
  • A biometric template is extracted from the 3D facial geometry (skull curvature, etc)
  • The template is based on the unique rigid tissues of the skull which are unchanging over time
  • The resulting numeric template is stored in an ordinary database
  • Identification is performed by matching the biometric template against the enrollment database
  • Verification is performed by matching the biometric template against a template stored on a smart card
3D Technology Advantages
A4Vision technology is superior to other biometric technologies:
  • Is not affected by lighting conditions, background colors, facial hair or make-up
  • Provides higher performance at different view angles
  • Is of higher accuracy in real-life environments


Copyright © 2006 A4Vision, Inc. All Rights Reserved.