Method and apparatus for enhancing the integrity of visual authentication
US5933502A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1996 |
| Grant date | Aug 3, 1999 |
| Priority date | — |
| Expiry date | Dec 20, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S17/89
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus in accordance with the present invention, in response to a request for access to a secure resource, modulates an illumination light source, such as a computer display, in a pseudo-random sequence to produce time-varying light emissions that reflect off of the object being imaged by an image recognition system. The authentication system controls both the generation of the modulated light emissions and the detection of their reflection from the object, in real time. This prevents an adversary from spoofing a visual authentication system by replaying recorded images. In further aspects of the present invention, combinations of visible and infrared illuminations may be used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.