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Physiological or Behavioral

Verification vs. Identification


Biometrics Technologies

How it works


Are Biometric Systems Difficult to Use?

Security of Biometrics           Template

What Factors Cause Biometric Systems to Fail?

Application design



What Factors Cause Biometric Systems to Fail?

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Biometric system performance varies according to sample quality and the environment in which the sample is being submitted. While it is not possible to definitely state if a biometric submission will be successful, it is possible to locate factors that can reduce affect system performance. 

The IBG Strike System details, technology-by-technology, aspects that work against a successful verification. Some of these strikes are listed below.


  • Cold finger 

  • Dry/oily finger 

  • High or low humidity 

  • Angle of placement 

  • Pressure of placement 

  • Location of finger on platen (poorly placed core) 

  • Cuts to fingerprint 

  • Manual activity that would mar or affect fingerprints (construction, gardening) 

Voice recognition

  • Cold or illness that affects voice

  • Different enrollment and verification capture devices

  • Different enrollment and verification environments (inside vs. outside)

  • Speaking softly

  • Variation in background noise

  • Poor placement of microphone / capture device 

  • Quality of capture device 


  • Too much movement of head or eye

  • Glasses

  • Colored contacts


  • Too much movement of head or eye

  • Glasses

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