Monitoring system using infrared image processing
US4999614A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 1988 |
| Grant date | Mar 12, 1991 |
| Priority date | — |
| Expiry date | Nov 28, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/194
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Temperature data of each picture element output from a infrared camera looking at a scene to be watched is compared with the same data of a previous frame. Temperature data which has changed from the previous frame is input to a histogram operator having a region defined by the temperature change and quantity of the picture elements. When the quantity of picture elements in the defined region exceeds a threshold level, it is recognized that a certain object having considerable temperature change and size has been detected. Thus, a signal is output to trigger an alarm system, or to sustain circulating frame memories which have recorded the previous scenes so that the scenes of visible light as well as the temperatue patterns for frames before, on, and after the trigger signal can be reproduced as visual images of a display screen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.