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

An infrared thermal imager and fire early warning technology, which is applied in the direction of fire alarms that rely on radiation, which can solve problems such as missed reports and failure to monitor

Active Publication Date: 2015-11-11
SUZHOU HUAQI INTELLIGENT TECH +1
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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

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

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Embodiment Construction

[0042] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0043] refer to figure 1 As shown, a fire early warning method based on an infrared thermal imager in a long and narrow environment, the method includes the following steps:

[0044] Step 1) Preprocess the infrared images in the long and narrow space collected by the infrared thermal imaging camera. Image preprocessing is to perform image segmentation based on the temperature difference between the target and the background to obtain the position of each target area; the image segmentation method includes Follow the steps below:

[0045] Step 1.1) Denoising the original infrared image data by median filtering method;

[0046]Step 1.2) The image obtained after preprocessing contains background noise, target and edge areas, and the quantization threshold is selected to transform the preprocessed image into an image with only 3 gray l...

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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...

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Application Information

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IPC IPC(8): G08B17/12
Inventor 刘晓华王宏雷胡勇军谭华春
Owner SUZHOU HUAQI INTELLIGENT TECH
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