Multi-frequency image fire detection system

Abstract

The invention relates to a multi-frequency image fire detection system comprising a chromatic / black and white double-changeful camera, a chromatic / near infrared double-changeful camera, an image collection module, a signal processing and control module, an input-output module, an alarm display device, a setting and debugging system, a communication device and an area alarm monitoring system, wherein the chromatic / near infrared camera is manufactured by adopting a CCD or CMOS image sensor with the frequency spectrum response range of 400nm-1200nm and a high-pass infrared optical filter with the wave band of the cut-off frequency of 850nm (or 950nm and more than 950nm); and the chromatic / black and white camera also adopts the CCD or CMOS image sensor with the frequency spectrum response range of 400nm-1200nm. The signal processing and control module comprises a smoke and flame identification and fire data integration arithmetic, a light source control arithmetic, a cradle head control arithmetic, a double-changeful camera switching control arithmetic and a fire positioning arithmetic based on double cameras.

Description

technical field [0001] The invention relates to a multi-frequency image fire detection system based on color, black-and-white and near-infrared rays, which consists of a color / black-and-white, color / near-infrared double variable camera, an image acquisition module, a signal processing and control module, an input and output module, and an alarm display Device, setting and debugging system, communication device and central fire alarm system, and can be equipped with infrared background light source and pan / tilt as required. The system includes multi-frequency image smoke and flame detection algorithms and fire data fusion algorithms to meet the requirements of fire detection under various lighting conditions to the greatest extent. Background technique [0002] With the continuous development of global industrial, commercial, and civil construction facilities year after year, fires are also increasing year-on-year; in recent years, global climate change has brought disasters ...

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Problems solved by technology

And if the system adds camera parameter control, it is estimated that the algorithm will be very complicated

Therefore, in theory, it will be difficult to use a camera with fixed spectral characteristics to meet the requirements of simultaneous detection and alarm of flame and smoke.

[0007] There are also cases where thermal imaging systems are used for fire detection, but thermal imaging systems often use long-wave or medium-wave infrared rays, and the cost of sensors is high

In addition, the thermal imaging system can better detect flames and overheated parts, but it cannot detect smoke, let alone detect blocked flames.

[0008] There is still a common problem in the previous system, which is basically a fixed field of view system, because the variable field of view will bring the complexity of the algorithm and the delay of detection and alarm

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