Automatic gain amplifier for biometric sensor device
US6518560B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 2000 |
| Grant date | Feb 11, 2003 |
| Priority date | — |
| Expiry date | Apr 27, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/1306
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An automatic gain amplifier is disclosed that dynamically improves the quality of scanned biometric information. According to one embodiment, an image distribution of the scanned biometric is generated. Next, areas of higher image distribution are identified. An iterative process of adjusting the gain of, for instance, a capacitive sensing, is employed until an optimum separation of the areas of higher image distribution is achieved. Once the optimum separation is achieved, the gain is applied to the biometric sensing device so that biometric information can be scanned with improved image clarity. Electronic circuitry and software for implementing the methods are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.