Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

When to Fuse Two Biometrics?



Elham Tabassi, Patrick J. Grother, George W. Quinn


Biometric fusion, acquisition and combination of multiple pieces of evidence of identity, can achieve higher accuracy of biometric recognition than using a single biometric. However, fusion increases the cost or throughput of the system since it requires acquisition and processing of more samples. We document a procedure for contingent fusion. That is, two biometrics are fused only if verification on the first presented biometric is rejected. We present results of this approach for both decision and score level fusion, and examine the combination of two different algorithms, two different modalities, and two different instances of a biometric. We conclude that contingent fusion results in comparable accuracy and lower cost as measured by processing time per sample than always fusing two pieces evidence of the same identity.
Conference Dates
September 19-21, 2006
Conference Location
baltimore, MD
Conference Title
IEEE Computer Society on Computer Vision and Pattern Recognition, Workshop on Multi-Biometrics


biometric verification, fusion, multi-biometrics, multi-modal


Tabassi, E. , Grother, P. and Quinn, G. (2006), When to Fuse Two Biometrics?, IEEE Computer Society on Computer Vision and Pattern Recognition, Workshop on Multi-Biometrics, baltimore, MD, [online], (Accessed April 20, 2024)
Created June 13, 2006, Updated February 19, 2017