Method and apparatus for object recognition
US6424745B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 1998 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | May 19, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V20/68
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and system for optically recognizing an object from a reference library of known products based on a spectrum of local radius of curvature of the object. A surface portion of an object is illuminated with a pattern of light that permits the extraction of three dimensional coordinates for a set of points on the surface portion of the object. An image data set of the surface portion of the object is then captured with a capture device that is positioned at an angular offset with respect to a source of the light. That is, the combination of the light pattern and the imaging device together generate a two dimensional captured image, from which it is possible to extract the three dimensional coordinates for the set of points on the surface portion of the object. A set of local radii of curvatures are then determined for selected data points in the image data set. A spectrum representing a distribution of the curvatures is then computed for the set of local radii of curvatures. If the data set is for the generation of a library of spectra, it is processed with a dimension reduction analysis to determine a single set of basis functions representing all of the objects and a corres…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.