| 摘要 |
A smoke detection system comprising video camera monitoring means, video fra me comparison means, signal processing means, and alarm generating means dependant on an output from the signal processing means; the signal processi ng means being arranged to analyse successive frames acquired by the video came ra monitoring means and to compare the intensity and/or colour of individual pixels or group of pixels so as to consider the overall characteristics and inter-relationships of these pixels so as to detect the presence of smoke characterised in that the signal processing means analyses a plurality of different types of change in the said characteristics and inter-relationship s.
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