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US 7,002,478 B2Granted
Smoke and flame detection
AssigneeVSD Limited
InventorsIan Frederick Moore, Edward Grellier Colby, Michael John Black
Life of this patent
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Abstract
A method of operating a computer for smoke and flame detection comprising the steps of: receiving digitised images of the region to be monitored; comparing pixels of one of said images with pixels of another said image according to two predetermined procedures to produce a flame present decision and a smoke present decision; and providing a fire detected signal according to said smoke present and flame present decisions.
Claims4
A method of detecting smoke and flame, the method comprising the steps of:
- receiving digitized images of a region to be monitored;
- comparing pixels of one of said images with pixels of another said image according to two predetermined procedures to produce a flame present decision and a smoke present decision;
- one said predetermined procedure which produces said flame present decision comprises the step of filtering said digitized images such that only changes in pixel characteristics occurring within a predetermined frequency band are used to produce said flame present decision:
- and
- providing a fire detected signal according to said smoke present and said flame present decisions.
2 more elements
Dependencies are inferred from the claim text.