Bifurcation
Definition
A minutia at which a single friction ridge divides into two diverging ridges. One of the two most common minutia types (with ridge endings). Encoded in AFIS as a point with a directional angle.
- Definition
- Single ridge dividing into two
- Category
- Minutia type
- Common counterpart
- Ridge ending
- AFIS encoding
- Point with a directional angle
Common questions
How is a bifurcation different from a ridge ending in AFIS matching?+
A ridge ending marks a point where a ridge terminates, while a bifurcation marks a point where one ridge splits into two, and AFIS algorithms encode both with position and angle so an examiner or system can compare their relative arrangement across two prints.
Can a bifurcation be mistaken for a ridge ending?+
Yes, this ambiguity commonly arises with a short ridge, partial print clarity, or pressure distortion, which is why examiners rely on ridge flow context and multiple corroborating minutiae rather than a single point.
Related terms
- Blind Verification
- The procedure in which a second fingerprint examiner independently performs the Analysis and Comparison stages without knowledge of the first examiner's conclusion....
- Champod Minutia Frequency Study
- Empirical research by Champod and Evett (2001) characterising the frequency distributions of minutia types and spatial configurations from operational fingerprint databases, providing...
- FRStat
- The fingerprint statistical scoring model developed by the FBI Laboratory and Iowa State University (Professor Alicia Carriquiry). Takes ACE-V comparison documentation as...
- Galton Features
- The set of observable ridge events catalogued by Francis Galton in his 1892 monograph, including ridge endings, bifurcations, and enclosed formations. The...
- Lake (Enclosure)
- A minutia in which a ridge briefly splits into two and immediately re-joins, enclosing an oval space. Less common than endings and...
- Level 1 Detail
- In ACE-V, the broadest level of information extracted from a fingerprint: the overall ridge flow and pattern type (arch, loop, whorl). Level...
- Level 2 Detail
- The intermediate spatial scale: individual minutia (ridge endings, bifurcations, lakes, dots, islands, deltas, cores). Carries the principal discriminative weight in a fingerprint...
- Level 3 Detail
- The finest spatial scale: sweat pore positions, ridge edge contours, incipient ridges. Reliably interpretable only in high-quality inked or latent prints. Used...
- Ridge Ending
- A minutia at which a single friction ridge terminates abruptly. One of the two most common minutia types (with bifurcations). Encoded in...