Method for calibrating at least two video cameras relatively to each other for stereoscopic filming and device therefor
US7557835B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 2004 |
| Grant date | Jul 7, 2009 |
| Priority date | — |
| Expiry date | Oct 29, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N13/246
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods for calibrating at least two video cameras for a stereoscopic device includes: providing, on the lane portion, nine marks of hue other than that of the lane, sequenced on a first set of three concurrent virtual straight lines in a first point and distributed in specific manner on a second set of concurrent virtual straight lines in a second point; forming, with each of the cameras an image of the lane portion; defining, in each of the two images, one characteristic point of each mark image; determining, with the characteristic points, six concurrent straight line images respectively in two concurrent points; and processing the video signals delivered by each video camera such that the signals are representative of two images suitable for forming a stereoscopic video image. The method is useful for determining the occupancy condition of a lane portion and detecting incidents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.