Method for measuring visibility from a moving vehicle
US5987152A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1997 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | Nov 18, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T7/246
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a method of measuring visibility from a vehicle in motion, images taken by an optical-electronic camera are transformed into selected image features establishing the loci of defined brightness variations in the images. A range determination of the selected features relative to the optical-electronic camera is carried out followed by filtration of the range readings to establish the prevailing visibility for a vehicle operator or a sensor system based on image processing. The advantage over conventional active methods is that, without requiring an active transmitter, the true visual object contrast as well as the atmospheric transmission enters into the visibility determination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.