Method for detecting and positioning fire utilizing with colour image three-primary colours difference

Abstract

The fire monitoring technology of the present invention is a fire differential analysis technology, adopts a color CCD camera system, uses the different reflections of the three primary colors of the color image on the early flame, performs differential calculations on the red and blue primary color components, binarizes, and performs differential calculations again, using the flame The growth rate of the area difference image is used to judge the abnormality of the fire, and the direct linear transformation technology is used to locate the fire space, which improves the reliability of fire detection. The existing closed-circuit television system can be used to realize the automatic monitoring, positioning and monitoring of the fire by the computer. Linkage saves.

Description

Technical field: [0001] The invention relates to the technical field of fire monitoring. Background technique: [0002] Existing fire monitoring devices mainly include three types: smoke sensing, sensing temperature and flame sensing. However, sometimes the temperature rise is not caused by fire burning, but due to the heat released by the climate or normal operations; simple smoke recognition is also lacking in reliability in many occasions, because the color of smoke, the size of smoke particles, and environmental dust , Space height, airflow and other factors are easy to cause errors in identification and judgment, resulting in delayed or false alarms; using sensors to detect infrared and ultraviolet light to judge fires also has similar defects, because it is not only fire that produces infrared, Ultraviolet light, such as electric welding arc, toluene, and lens icing, often lead to false or delayed alarms of ultraviolet light sensors; infrared light sensors can only re...

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Problems solved by technology

However, sometimes the temperature rise is not caused by fire burning, but due to the heat released by the climate or normal operations; simple smoke recognition is also lacking in reliability in many occasions, because the color of smoke, the size of smoke particles, and environmental dust , Space height, airflow and other factors are easy to cause errors in identification and judgment, resulting in delayed or false alarms; using sensors to detect infrared and ultraviolet light to judge fires also has similar defects, because it is not only fire that produces infrared, Ultraviolet light, such as electric welding arc, toluene, and lens icing, often lead to false or delayed alarms of ultraviolet light sensors; infrared light sensors can only respond to flames with flickering characteristics, but it is more difficult to detect high-pressure gas flames; Modulated blackbody heat sources are also prone to false alarms from infrared sensors

Chinese patent application 93214042.0 proposes to use a black-and-white camera plus a special filter device for fire monitoring, which partially solves the problem of high false alarm rate of the above method, but the loss of black-and-white image information is too large; the introduction of the filter device reduces the system cost. Reliability and versatility, because the filter device can only pass through the infrared and near-infrared bands, and the whole system cannot perform other special monitoring at the same time during fire monitoring; only the filter device can be switched continuously in front of each camera to perform simultaneous monitoring Fire detection and professional purpose detection of each user unit; the working condition of the filter device directly affects the reliability of the system; in addition, the fire position it detects is still image coordinates, and the conversion between image coordinates and actual coordinates has not been realized, thus It is impossible to match the fire location with the control range of the fire extinguishing device, and it is impossible to further realize the real automatic fire fighting work

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