License plate reading system with enhancements
US11532170B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 2020 |
| Grant date | Dec 20, 2022 |
| Priority date | — |
| Expiry date | Apr 30, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V20/625
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
System and methods are disclosed for capturing license plate (LP) information of a vehicle in relative motion to a camera device. In one example, the camera system detects the LP in multiple frames, then aligns and geometrically rectifies the image of the LP by scaling, warping, rotating, and/or performing other functions on the images. The camera system may optimize capturing of the LP information by executing a temporal noise filter on the aligned, geometrically rectified images to generate a composite image of the LP for optical character recognition. In some examples, the camera device may include an image sensor, such as a high dynamic range (HDR) sensor, modified to set long and short exposures of the HDR sensor to capture frames of a vehicle's LP, but without consolidating the images into a composite image. The camera system may set optimal exposure settings based on detected relative speed of the vehicle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.