Video preprocessing of image information for character recognition
US8218821B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 2007 |
| Grant date | Jul 10, 2012 |
| Priority date | — |
| Expiry date | Dec 27, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V20/625
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus processes video signals containing video information related to a scene which may contain a vehicle license plate. The apparatus includes a video camera having a video imaging device for viewing the scene and generating a first video signal. A character detector in the video camera processes the first video signal to detect a license plate within the scene and to generate location information indicating the location of the license plate. A line detector in the camera determines a particular video line of the first video signal into which the location information is to be embedded. An insertion circuit in the camera embeds the location information into the particular video line of the first video signal to form a second video signal. The apparatus may also include a video capture device for receiving the second video signal from the video camera and converting the second video signal into digital image data. A processor extracts the location information from the digital image data, determines the location of the license plate characters within the scene based on the location information, and processes the digital image data to read the license plate characters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.