Method for determining the scale of an observation area
US7317198B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2003 |
| Grant date | Jan 8, 2008 |
| Priority date | — |
| Expiry date | Sep 22, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/8903
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method in the control of the quality or the condition of a fibre web (21) on the basis of optical imaging diagnostics, wherein the fibre web (21) under examination and/or means (22, 23) relating to the processing of the fibre web are monitored with at least one optical imaging measuring device (1 to N). According to the method, the scale of the observation area of said at least one imaging measuring device (1 to N) is calibrated, when said measuring device is taken into use, by means of one or more calibration objects placed in the observation area of the measuring device, to correct the perspective error caused by the position between said measuring device and the object (21, 22, 23) observed by it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.