Device for measuring visibility distance
US7873188B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 19, 2005 |
| Grant date | Jan 18, 2011 |
| Priority date | — |
| Expiry date | Feb 4, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V20/56
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a device for determining visibility distance in a landscape. The device comprises a camera for taking an image of said landscape; means for storing said image; means for associating each pixel of the image with information representative of the distance between the camera and the point in the landscape corresponding to said pixel, thereby obtaining a map of distances; means for processing the image to detect whether a pixel of the image presents contrast greater than a predetermined value relative to at least some adjacent pixels; means for applying said processing for detecting contrast successively to the pixels of the image beginning from the pixel corresponding to the greatest distance and continuing to the first pixel found to satisfy the contrast condition; and means for associating said pixel with distance information from said map of distances.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.