Fire early warning method based on infrared thermal imager in narrow environment

Abstract

The invention provides a fire early warning method based on an infrared thermal imager in a narrow environment. According to the method, infrared images in a narrow space acquired by the infrared thermal imager are pre-processed, image segmentation is realized by employing a connected domain manner, high-temperature objects, suspected high-temperature objects, and low-temperature objects are determined in a preliminary manner according to the absolute temperature, continuous multi-frame video images are acquired in the area of the suspected high-temperature objects whose temperature of segmented target images is from 70 to 100 DEG C, further image segmentation and binaryzation of the multi-frame video images are performed, the characteristics of the dispersion degree, the number of sharp corners, and height change of the segmented target area are calculated and regarded as flame shape characteristics, and flame monitoring determination of flames in a suspected high-temperature target area is performed based on a probability statistics model according to the flame shape characteristics. By employing the method, fire sources can be recognized more accurately, the influence of interference targets such as water is distinguished, and the accuracy of early warning is greatly improved.

Description

technical field [0001] The invention relates to a fire early warning technology in narrow and long environments such as train carriages and aircraft cabins, and in particular to a fire monitoring and early warning method based on an infrared thermal imager in a long and narrow environment with limited lighting. Background technique [0002] Smoke detectors are generally used for fire warning in narrow and long spaces such as EMU carriages or aircraft cabins. Due to the large number of wiring in EMU carriages or aircraft cabins, the air circulation is not smooth, and there are problems such as delays in fire monitoring and vulnerability to environmental influences. Infrared thermal imaging technology is to convert the invisible infrared energy emitted by the object into a visible thermal image. Compared with the visible light camera, the temperature of the object can be judged according to the infrared radiation intensity of the object, so as to exclude a large amount of inter...

AI Technical Summary

Problems solved by technology

For example, the temperature of interference targets such as hot water is usually 70-100 degrees Celsius, and the temperature of the flame of a lighter is about the same as the intensity of hot water radiation at 70 degrees Celsius due to the faster heat dissipation. Misjudgment

That is: if the temperature threshold for judging the flame is set to 70 degrees Celsius, then hot water may be considered as a flame and a false alarm is issued; The flame may not be detected, resulting in false alarms

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