Method and apparatus for the optical determination of surface profiles
US4801207A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 2, 1987 |
| Grant date | Jan 31, 1989 |
| Priority date | — |
| Expiry date | Jan 2, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/245
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for providing information as to the cross-sectional shape or profile of a body is disclosed in which a known datum in the form of a bar 50 having a cross-shaped cross-section is detected by a camera 14. A body is then detected by the camera 14 to provide preliminary information as to the shape or profile of the body and the preliminary information is transformed in accordance with a variation of the detected datum from the known datum to provide a better indication of the true cross-sectional shape or profile of the body. The known datum 50 enables at least three non-colinear reference locations to be defined and calibration parameters are determined from the reference locations so that exact reference locations can be determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.