Fire detection system utilizing relationship of correspondence with regard to image overlap
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United States of America Patent
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-
Jul 20, 1999
Grant Date -
N/A
app pub date -
Jul 28, 1997
filing date -
Jul 29, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fire detection system extracts fire (flame) portions from images produced by a monitoring camera while eliminating portions depicting artificial light sources. Portions depicting a light source that emits light are extracted from images produced by the monitoring camera. The system judges whether or not pairs of the extracted portions of images produced with the passage of time have a relationship of correspondence. If the extracted portions are contained in images produced for a given period of time, the light source is judged not to be the lamps of a moving vehicle, and is therefore identified as a fire. An area of an overlapping part of the extracted portions of images produced at different time instants, and an overall area of the extracted portions are computed, and the ratio of the area of the overlapping part to the overall area, that is, the area ratio between the extracted portions is computed. Incorrect alarming due to a vehicle at a standstill or a rotating lamp can be prevented.
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