Method, system and apparatus for determining a hash code representing a portion of an image
US9177388B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 2013 |
| Grant date | Nov 3, 2015 |
| Priority date | — |
| Expiry date | Jul 30, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F16/56
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method of determining a hash code representing a portion of an image, is disclosed. A Delaunay region (e.g., 450) enclosing an image feature point (e.g., 210) representing at least the portion of the image is determined. The Delaunay region is determined from A* lattice points. A mapping transforming the Delaunay region to a predetermined canonical form is determined A point of the Delaunay region is received. The received point defines a plane containing the A* lattice points of the Delaunay region excluding the received point. A normal of the plane is determined by setting at least two co-ordinates of the normal to predetermined non-zero values, the two co-ordinates being selected according to the determined mapping. The hash code representing a portion of the image is determined according to a distance determined using the normal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.