Road position detection
US7542589B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 22, 2004 |
| Grant date | Jun 2, 2009 |
| Priority date | — |
| Expiry date | Apr 19, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/754
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A dynamic contour extracting means detects, using a dynamic contour extraction method generally known as SNAKE, a contour of a recognition object included on an image by the following steps: a curve with control points is disposed in an image; an internal energy Eint indicating smoothness of the curve, an image energy Eimage, and an external energy Eext are summed up; and the curve is modified so that the summed total energy becomes the minimum. Here, a template is stored for including disposition information of primary control points that are bound to be moved only in a vertical or horizontal direction based on a road shape. The dynamic contour extracting means moves the primary control points based on the template. The primary control points can be rapidly moved owing to their limited movement direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.