Process and device for detecting fires bases on image analysis
AssigneesSecuriton, AG, Fastcom Technology SA
InventorsDidier Rizzotti, Nikolaus Schibli, Werner Straumann
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Abstract
Method for automatically detecting fires, based on flame and/or smoke recognition by analyzing a sequence of images. The analysis is based on several image processing algorithms. One algorithm consists in comparing the frequency content of at least an image of said sequence with the frequency content of a reference image so as to detect an attenuation of high frequencies independently of variations on other portions of the spectrum.
Claims27
An automatic fire detection method, based on the recognition of flames and/or smoke from the analysis of a sequence of images, the analysis being based on several image processing algorithms,
- an algorithm comprising a step of comparing the frequency content of at least one image of said sequence with the frequency contents of a reference image in order to detect an attenuation of the high frequencies independently of the variations on the other portions of the image's spatial spectrum.
An automatic fire detection method, based on the recognition of flames and/or smoke from the analysis of a sequence of images, the analysis being based on at least two different image processing algorithms selected among the following algorithms:
- a first algorithm comprising a step of comparing the frequency content of at least one image of said sequence with the frequency contents of a reference image in order to detect an attenuation of the high frequencies independently of the variations on the other portions of the image's spatial spectrum;
- and/or
- a second algorithm comprising a step of detecting smoke by measuring the saturation of colors in at least one portion of said images;
- and/or
- a third algorithm comprising a step of detecting the disappearance of straight segments in at least one portion of said images;
- and/or
- a fourth algorithm comprising a step of analyzing the variations between consecutive images in order to detect objects whose outline oscillate with a frequency greater than 0.5 Hz;
- and/or
- a fifth algorithm comprising a step of identifying objects whose shape and/or color vary in a non-regular manner;
- and/or
- a sixth algorithm comprising a step of evaluating the color temperatures in at least a portion of said images in order to detect the presence of flames;
- and/or
- a seventh algorithm comprising a step of using several image sequences representing the same view at different angles;
- and/or
- an eighth algorithm comprising a step of detecting the presence of a new object in a portion of the image.
Dependencies are inferred from the claim text.