Differential imaging rain sensor
US6603137B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 16, 2001 |
| Grant date | Aug 5, 2003 |
| Priority date | — |
| Expiry date | Jul 16, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V20/56
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A method and assembly for sensing moisture on the exterior surface of a sheet of glass (16) by capturing an ambient image (A) of light rays passing through the glass (16) from the exterior to the interior surfaces thereof under ambient light conditions. The invention is characterized by illuminating (18) the glass with pulses of light rays, capturing an illuminated image of the glass containing the ambient image (A) plus the illuminated image (B) containing the reflected light from the illuminating (18) of the glass (16) between the ambient images (A), and subtracting each ambient image (A) from the next adjacent illuminated image (B) to produce a moisture signal (30).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.