Self-calibrating, multi-camera machine vision measuring system
US6931340B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2002 |
| Grant date | Aug 16, 2005 |
| Priority date | — |
| Expiry date | Jun 6, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B2210/303
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and method for calibrating machine vision measuring systems that have more than one camera are disclosed. A first calibration target is mounted in a fixed relationship to a first camera of the machine vision measuring system. A third camera mounted in a fixed relationship to a second camera of the machine vision measuring system. Second and third calibration targets are mounted in a fixed relationship to one another and viewable by the first camera and by the third camera. A data processor is programmed to compute calibration of the first camera and the second camera, based on a position of the second calibration target relative to the third calibration target and based on a position of the first camera with respect to the third camera. The apparatus and method provide a way to continuously measure the positions of two or more cameras used in the measuring system, and to use such measurements to calibrate the system. If the cameras move with respect to each other, their respective positions are calculated and used in subsequent measurements. The apparatus and method enable a machine vision measuring system to be used without field calibration at the time of installatio…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.