Anti-fraud biometric scanner that accurately detects blood flow
US5737439A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1996 |
| Grant date | Apr 7, 1998 |
| Priority date | — |
| Expiry date | Oct 29, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L63/0861
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The invention discloses an anti-fraud biometric scanner that determines whether an object exhibits characteristics of blood flow consistent with that of a live human. The anti-fraud biometric scanner has biometric scanning means for obtaining a biometric sample from the object, blood flow detection means for determining whether the object exhibits characteristics of blood flow consistent with that of a live human, and deception detection means for determining if the object is attempting to deceive the blood flow detection means. The blood flow detection means comprises a first light source for illuminating the object, a photodetector for measuring light energy from the object, and computing means for controlling the first light source and processing output from the photodetector. The deception detection means provides means for detecting movement by the object in an attempt to deceptively simulate blood flow. The means for detecting movement uses the computing means and turns off the first light source, turns on a second light source, measures any time-varying light energy from the object, and, if the measured time-varying light energy is above a threshold, determines that fraud is…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.