Market research firm Yole Développement (Yole) predicts that the compound annual growth rate of uncooled infrared imager shipments will be 15.8% between 2016 and 2021. According to incomplete statistics, the potential demand for China's infrared thermal imaging market can reach 50-60 billion yuan, and the current market is only in its infancy. It is expected that by 2020, the infrared imaging market will grow by more than 20%.
Faced with limited road resources, HOV lanes began to develop gradually. Familiar friends know that the HOV lane is a special “single car†and requires two or more passengers. The so-called "there are policies, there are countermeasures", the drivers want to put out dolls, pets, etc. instead. Then, how does the traffic policeman Li Bai take over?
According to reports, the Chengdu Traffic Management Bureau will adopt the combination of on-site law enforcement and off-site law enforcement for the illegal traffic police department. At the same time, it will introduce infrared thermal imaging technology to identify the number of actual passengers on the vehicle, and rely on the technology monitoring equipment to achieve illegal access to HOV. Automatic capture of lane vehicles. First of all, science.
What is infrared thermal imaging?Infrared thermal imaging technology is a passive infrared night vision technology. Its principle is: based on all objects in the natural world whose temperature is higher than absolute zero, infrared rays of different wavelengths will be emitted, and the infrared radiation will carry the characteristic information of the object. By detecting the infrared radiation emitted by the object, the thermal imager produces a real-time image that provides a thermal image of the scene. The invisible radiation image is transformed into a clear image that is visible to the human eye. Thermal imagers are very sensitive and generally detect temperature differences of less than 0.1 °C.
How do you identify the number of live passengers on a HOV lane?
If there are only drivers in the car and no other occupants, the corresponding picture information will be transmitted back to the back-end system as one of the materials for illegal judgment.
Chengdu's road traffic equipment for HOV lanes has the following distinctive features: first, the color is yellow, and ordinary monitoring equipment is silver-gray; second, there are 4 independent equipment boxes, and ordinary equipment has only one equipment box; third, it has multiple sets of supplements. Optical equipment guarantees vehicle-by-vehicle detection.
The human body itself is an infrared radiation source that constantly diverges and absorbs infrared radiation. The thermal imager passively collects the infrared radiation of the human body, converts it into a digital signal, and generates a color heat map.
The cities that have opened HOV lanes include Wuxi, Jinan, Shenzhen and Chengdu, but Chengdu, which uses infrared thermal imaging technology.
Compared with other monitoring methods, infrared thermal imaging has the advantages of not relying on visible light, long observation distance, and multiple display modes. In fact, the results of professional testing show that the recognition rate of infrared thermal imaging is not ideal. The thermal imaging system focuses the infrared radiation on a device capable of converting the infrared radiation energy into a measured physical quantity, and then converts the radiation signals of different intensity into corresponding electrical signals, and then is amplified and video processed to form a human eye. Observed video images, processed multiple times, with poor background contrast. In addition, thermal imaging has poor ability to distinguish details, and it is impossible to see the face and appearance features, and it depends on the temperature difference of the observation target, and the smear is high on the high-speed moving target.
According to industry insiders, the video is more optimistic about the number of live passengers on the HOV lane. For example, after framing the insiders, the machine learning method is used to calibrate tens of thousands and hundreds of thousands of images, which can be automatically realized later.
Application in the field of intelligent transportationIn addition to identifying the actual number of vehicles in the vehicle, infrared surveillance cameras can also be applied to road intersection control and narrow roadway road monitoring and detection. The core is the application of video image processing software, often used in conjunction with perimeter intrusion detectors.
The application of thermal imaging systems in the transportation sector is manifested in several ways:
The first is to detect the car through the intersection signal light control. At the intersection, the thermal imaging can sense the different temperatures between pedestrians, non-motor vehicles and motor vehicles, and trigger the detection to transmit the signal to the intersection signal. However, this is not seen in the actual domestic intersection. Use.
The second is to automatically detect events along the road. It is not affected by the sun and is almost independent of the external environment, meeting the needs of real-time monitoring of 7*24 hours.
Third, as a fixed-mounted detector on the road, it can also be used for pedestrian detection. Flir launched the "Smart Zebra" solution based on thermal imaging technology, which was installed in more than 20 cities last year.
The fourth is the current unmanned layout. Zhang Guijie, manager of Flir Intelligent Transportation China, introduced that the thermal imager is used as an in-vehicle device for assisted driving. Its line of sight is five times that of the headlights, which helps drivers to find roadblocks, other vehicles and corners earlier, thus effectively reducing nighttime. Driving risks to avoid casualties.
(The image on the left is visible light on the left and the red thermography on the right)
According to research, infrared thermal imaging technology will be an important part of the car's intelligent safety assisted driving system or driverless system.
Market development trendChina has only begun research on infrared thermal imaging technology since the 1970s. For a long time, this technology has been stuck in the military industry. For domestic manufacturers, this road costs too much money and energy, the cycle is too long, the barriers are too high, and the risks are too great.
In recent years, infrared thermal imaging technology has been slow to develop. Because of the high cost and limited import restrictions, it is mostly used in military and special industries. Currently, it is not widely used in the transportation field.
Compared with the intelligent transportation field, infrared thermal imaging technology has a broader development prospect in the security field. Infrared thermal imaging technology will become a hot industry comparable to visible light camera technology. The two advantages complement each other and truly realize multi-spectral all-weather video surveillance.
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