초록 ▼

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 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.

대표청구항 ▼

What is claimed is: 1. 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 de

What is claimed is: 1. 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. A method as claimed in claim 1 in which the pixels of successive images are compared. 3. A method as claimed in claim 1, wherein said filtering step comprises filtering out changes in pixel characteristics occurring in the frequency band 1.25 to 4 Hz. 4. A method as claimed in claim 1, wherein said one procedure includes the step of determining the density of changes in pixel characteristics and determining the presence of a flame if a density in excess of a predetermined density value is determined.