System and method for determining the position of an object in three dimensions using a machine vision system with two cameras
US6728582B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 2000 |
| Grant date | Apr 27, 2004 |
| Priority date | — |
| Expiry date | Jul 10, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P90/02
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system and method for estimating the position of an object in three dimensions uses two cameras interconnected with a machine vision search tool. The search tool is capable of registering transformation of a pattern in at least two translational degrees of freedom, along the image plane, and at least one non-translational degree of freedom along a camera axis perpendicular to the image plane. The tool can be a rotation/scale-invariant (RSIS) search tool. A nominal position for each camera's acquired image of the object is determined and a set of uncertainty vectors along each of the degrees of freedom is generated. The vectors are weighted, with the respective vectors along the camera axis being weighted more-highly than orthonormal vectors within the image plane. The weighted vectors are combined to define an error. The defined error is compared according to a least squares technique with selected three-dimensional position estimates and the minimum sum error is used to identify the best three-dimensional position estimate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.