Vehicle detecting method and apparatus performing binary-conversion processing and luminance variation processing
US5243663A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 3, 1991 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Oct 3, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/28
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A vehicle detecting apparatus for detecting a vehicle in each vehicle existence judging region based on binary pixel data, wherein a luminance level at which a variance of luminance of pixels in each vehicle existence judging region takes a maximum value is calculated to thereby perform a vehicle detection by utilizing a change appearing in the variance of luminance in the vehicle existence judging region, where the change is caused by a quite small number of pixels in the vehicle existence judging region having luminance levels lower than a lower threshold value or higher than an upper threshold value, even if the majority of the pixels in the vehicle existence judging region have a luminance close to that of a road surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.