Vehicular traffic monitoring system
US5404306A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1994 |
| Grant date | Apr 4, 1995 |
| Priority date | — |
| Expiry date | Apr 20, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/04
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A vehicular traffic monitoring system incorporates an array of photosensors and a nonlinear resistive network for identifying, locating, and processing outliers in sensor images of a highway or intersection. The camera system can be mounted on a pole or overpass to provide an image of the roadway or intersection. Areas of the outlier network ("video loops") are designated to correspond to selected areas of the roadway. Images are received by the outlier detection network with all data path switches closed between sensor elements and their corresponding network nodes. The system detects the presence of objects in the image by comparing the brightness or intensity of each pixel with that of the background. If the intensity of a pixel is significantly different from the background level, the data path switch corresponding to that pixel is opened. A readout of the state of all the switches in the network yields a map of outlier points for each video frame. The outlier map is connected to a data processing system to identify and locate outlier points in the image. The detection of a threshold number of outliers in a video loop indicates the presence of a vehicle at the corresponding are…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.