| 摘要 |
The present invention provides a method and apparatus for detecting fire in a monitored area even if the flames are hidden behind obstructing objects. The steps of this method include: (a) detecting and capturing, at a prescribed frequency, video images of the monitored area, (b) converting the captured images into two-dimensional bitmaps of the temporally varying brightness values observed in the captured images, wherein the spatial resolution of this bitmap is determined by the number of pixels comprising the bitmaps, (c) specifying for any two of the pixels in the bitmaps a temporal coherence factor whose magnitude is a measure over a prescribed time of the similarities observed in the temporal variations of the brightness values being captured at each of the bitmap's pixels, (d) computing this temporal coherence factors for each of the prescribed set of pixels in the captured images, and (e) analyzing the computed temporal coherence factors to identify those sets of pixels that have temporal coherence factors whose values are above a prescribed threshold value, wherein this prescribed threshold value is set so as to identify those pixels that correspond to regions of the monitored area whose temporal variations in brightness indicate that the source of this brightness is a fire in the monitored area.
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