Vehicle speed intelligent measurement method based on binocular stereo vision system
US11922643B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Jul 29, 2020 |
| Grant date | Mar 5, 2024 |
| Priority date | — |
| Expiry date | Jul 29, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2013/0085
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for intelligently measuring vehicle speed based on a binocular stereo vision system includes: training a Single Shot Multibox Detector neural network to obtain a license plate recognition model; calibrating the binocular stereo vision system to acquire parameters of two cameras; detecting the license plates in the captured video frames with the license plate recognition model, locating the license plate position; performing feature point extraction and stereo matching by a feature-based matching algorithm; screening and eliminating the matching point pairs, and reserving the coordinates of the matching point pair closest to the license plate center; performing stereo measurement on the screened matching point pair to get the spatial coordinates of the position; calculating and obtaining the speed of the target vehicle. The present invention is easy to install and adjust, could simultaneously recognize multiple trained features automatically, and better suit the intelligent transportation networks and IoT (Internet of Things).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.