Vision system illumination calibration apparatus
US4979135A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 25, 1989 |
| Grant date | Dec 18, 1990 |
| Priority date | — |
| Expiry date | Sep 25, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/50275
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The vision system illumination calibration apparatus uses a pair of lamps, located one on either side of a vision element to illuminate a set of machine-readable characters imprinted in bar code format on a label affixed to a calibration target plate. The required level of illumination is set by the use of a predetermined calibration target label. The vision system is positioned opposite this calibration target label and the illumination level is varied in sequential steps. Control software identifies a range of illumination levels in which the calibration target label is accurately read by the vision element and sets the level of illumination of the lamps in this range of values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.