Image construction method, fingerprint image construction apparatus, and program
US7542594B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 28, 2005 |
| Grant date | Jun 2, 2009 |
| Priority date | — |
| Expiry date | Aug 2, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/1335
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In construction processing of a fingerprint partial image, distortion occurs in the general image due to accumulation of coordinate errors at image joining positions. While a latest partial image read by a sweep type fingerprint sensor is being displaced relative to an already acquired partial image, a displacement quantity at each displacement position is found. By interpolation computation using the found values, a first vector component indicating a movement quantity of the latest partial image in the slide direction, and first and second candidates for a second vector component indicating a movement quantity in a direction perpendicular to the slide direction are calculated as values each having a resolution higher than the pixel pitch. The latest partial image is disposed so as to be joined to the already acquired partial image on the basis of a movement quantity vector including the first and second vector components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.