Non-fingerprint region indicator
US4225850A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1978 |
| Grant date | Sep 30, 1980 |
| Priority date | — |
| Expiry date | Nov 15, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/42
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Signalling means for enhancing the performance of automatic fingerprint identification systems by reducing system response to non-fingerprint-like regions within an image field pattern of interest. A two dimensional generalized sequency analyzer, such as a fast Fourier transform machine, responsive to a binary coded image signal identifies discrete frequency terms occurring within a selected bandwidth corresponding to a spatial frequency region of interest, associated with a fingerprint image. Logic means, responsive to the sequency analyzer, further identifies the relative energy levels of the bandwidth-limited spectral content of the binary coded image signal to signal the identity of a non-fingerprint-like region within the scanned image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.