Method and device for acquiring latent fingerprint orientation
US8818056B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2012 |
| Grant date | Aug 26, 2014 |
| Priority date | — |
| Expiry date | Jan 27, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/1347
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and device for acquiring latent fingerprint orientation. The method includes: extracting a valid area in a latent fingerprint image; acquiring an orientation field of the valid area and a confidence of coordinate points in the valid area; dividing the orientation field into a first area with a high confidence and a second area with a low confidence; collecting control points in the first area, performing triangulation on control points in the first area and determining differences between control points to determine a set of control points; manually marking control points in the second area, adding control points marked to the set, performing triangulation on control points in the set and determining whether a new manually marked control point is to be added in the set according to a difference determination; and establishing a model for control points in the set to obtain an orientation field of the image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.