Method and system for defining and recognizing complex events in a video sequence
US6628835B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1999 |
| Grant date | Sep 30, 2003 |
| Priority date | — |
| Expiry date | Aug 24, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/188
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Given a system which detects simple events, one can define a complex event by constructing a list of sub-events. In order to recognize a complex event, the system keeps a record of the sub-events that have occurred thus far and the objects involved in these sub-events. Whenever the first sub-event in a complex event's sequence is recognized, an activation for that complex event is created. The activation contains an indication of the identity of the object involved in the event. The activation also includes an index initialized to one. If a newly detected event matches the next sub-event in any of the currently open complex events, the index for that complex event is incremented. If the index reaches the total number of sub-events in that complex event, the complete complex event is recognized. Thus any desired alarm is generated. Since the complex event that was just recognized may also be a sub-event of another complex event, the activation lists are consulted again to see if the indices of any other complex event activations can be advanced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.