Fingerprint photographing system
US5175593A · kind A · utility
20Cited by
2References
5Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jul 26, 1991 |
| Grant date | Dec 29, 1992 |
| Priority date | — |
| Expiry date | Jul 26, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/257
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A fingerprint photographing system comprising: a prism having a detection surface where a finger is pressed thereon; a luminous source for irradiating light to the detection surface; a camera for detecting the light reflected upon the detection surface; and means for comparing the image before and after the finger is pressed upon the detection surface and for storing the image of fingerprint to a memory when the number of pixels of the image with a predetermined density difference is in the range of predetermined number.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.