Optical positioning system and operating method thereof
US11105608B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 2019 |
| Grant date | Aug 31, 2021 |
| Priority date | — |
| Expiry date | Feb 26, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/34792
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
There is provided an operating method of an optical positioning system including: capturing an image frame of a detected surface, which has interleaved bright regions and dark regions, using a field of view and a shutter time of an optical sensor counting a number of edge pairs between the bright regions and the dark regions that the field of view passes; calculating an average value of the image frame; calculating a ratio between the calculated average value and the shutter time; determining that the field of view is aligned with one of the dark regions when the ratio is smaller than a ratio threshold; and determining that the field of view is aligned with one of the bright regions when the ratio is larger than the ratio threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.