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In order to ensure road safety surveillance the onboard camera function needs to operate around the clock as much as possible   Car mounted cameras perceive the surrounding environment through photosensitivity and algorithms  Therefore  in scenarios with insufficient lighting such as driving at night or passing through tunnels    it is necessary to enhance the camera's night vision ability   At present   car night vision systems can be divided into three categories based on imaging principles and lenses :  low light   near - infrared   and far - infrared  .
The existing night vision assistance system can recognize pedestrians beyond the high beam range and predict danger in advance .  Advance prediction to assist drivers in safe driving .

Low light :  Literally  it refers to the process of amplifying a small amount of visible light received   ultimately capturing and projecting an image onto the corresponding display screen .  The imaging principle of low light and general cameras is consistent   both of which achieve night vision through visible light   but require a certain visible light environment
Near car camera infrared night vision :  also known as active infrared night vision technology   refers to using a strong infrared emission source to illuminate the target during operation   and using the infrared reflected back by the target to obtain the image of the object .  Near infrared light operating in the wavelength range of 800 - 1000nm .

Far infrared night vision (thermal imaging system ) :  also known as passive infrared night vision technology   mainly uses the infrared radiation emitted by the object itself to image   which is also known as thermal imaging .  The thermal imaging system is based on the difference in infrared emissivity formed by the temperature difference between the target and the background .  It uses radiation temperature measurement technology to measure the radiation intensity of the target point by point   forming a visible thermal image of the target .  Its theoretical working wavelength is between 1 - 14um   but generally far infrared night vision mainly uses shortwave (3 μ M-5 μ m) And long wave (8 μ M - 14 μ m) These two types  .
Among them    the implementation of low light night vision for car mounted cameras needs to be improved from CMOS and algorithms ;  And infrared night vision requires specialized infrared lenses to ensure the entry of infrared light .  In addition   low light night vision can see color images   while infrared cannot achieve color

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