Open-loop light intensity calibration systems and methods
US6239554A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1999 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | Dec 30, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The input light settings in many vision systems often do not correspond to fixed output light intensities. The relationships between the measured output light intensity and the input light intensity are inconsistent between vision systems or within a single vision system over time. This inconsistency makes it difficult to interchange part-programs even between visions systems of one model of vision systems, because a part program with one set of light intensity values might produce images of varying brightness on another vision system. However, many measurements depend on the brightness of the image. To solve this problem, a reference lighting curve is generated for a reference vision system, relating an input light intensity value to a resulting output light intensity. A corresponding specific lighting curve is generated for a specific vision system that corresponds to the reference vision system. A calibration function is determined that converts a reference input light intensity value into a specific input light intensity value. Accordingly, when an input light intensity value is input, the specific vision system is driven at a corresponding specific input light intensity value …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.