Motion information extraction system
US6757328B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1999 |
| Grant date | Jun 29, 2004 |
| Priority date | — |
| Expiry date | Dec 15, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/513
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method, an apparatus, and a computer program product for extracting motion information (110) from a video sequence (130, 600) containing interframe motion vectors (120) are disclosed. In particular, motion information (110) is automatically extracted (610) from an encoded traffic video stream (600) to detect speed, density and flow. The motion information (110) extracted is under fixed camera settings and in a well-defined environment. The motion vectors (120) are first separated (610) from the compressed streams (130) during decoding and filtered (620) to eliminate incorrect and noisy motion vectors based on the well-defined environmental knowledge. By applying a projective transform (630) to the filtered motion vectors, speed, density, and flow can be detected (640, 650, 660). In this manner, a traffic monitoring system is implemented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.