Security monitoring What kinds of cameras are there
Security surveillance camera 1: night vision
The night vision function actually uses infrared sensing technology. For example, the automobile night vision system mainly uses thermal imaging technology, also known as infrared imaging technology. The principle is that any object will emit heat, and objects of different temperatures will emit different heat. Humans, animals and running vehicles emit more heat than their surroundings. The night vision system can collect this information and then transform it into a visual image to clearly present objects that could not be seen at night, thus increasing the safety of driving at night
Security surveillance camera 2: waterproof
The waterproof camera is usually installed in the open air, for example, the vehicle tail section is installed to form a rear view system. After being used for a long time, some blurring conditions will be mistaken as water ingress affecting the performance. Generally, there are several cases of camera blurring, one is the high and low temperature aging of plastic lens. The plastic lens is aging and blurring. The second reason is that there is steam inside the camera, and the glue filling is not good. The third reason is that there is dust on the surface of the camera.
The IP ×× level standard recommended by the International Electrotechnical Commission (IEC) is adopted for the protection level. The level is different for different installation sites. Please refer to the following description for details. In the grade standard, "××" is a two digit number. The first digit represents the protection level for solids and the second digit represents the protection level for liquids. There are 7 levels of solid protection, which are represented by 0-6; There are 9 levels of liquid protection, which are represented by 0-8.
Security surveillance camera 3: network
network video camera It is a new generation product combining traditional camera and network video technology. In addition to the image capture capabilities of general traditional cameras and the latest network camera, digital compression is also built-in controller And WEB based operating system, so that video data can be compressed and encrypted wireless network Send to the end user. It is not easy for outsiders in the market to distinguish between monitors and webcams. In fact, it can be said that the webcam is also a kind of monitor, but the webcam adds the function of combining with the Internet to the traditional monitor
Security surveillance camera 4: digital
Digital camera refers to a video image acquisition device that can be stably and efficiently applied to the carrier site, and can directly store the image on the hard disk. Like the popular integrated camera currently sold on the Internet, it directly stores the image on the SD card. Compared with ordinary cameras, digital cameras have requirements for resolution, frame rate and light, The exposure mode is highly comparable, and the main component is the CCD sensor core.
Security surveillance camera 5: infrared
The infrared camera mainly realizes day night conversion through the infrared filter, that is, open the filter in the daytime to prevent infrared from entering the CCD, so that the CCD can only sense visible light; Under the condition of night vision or poor lighting conditions, the filter stops working and no longer blocks the infrared ray from entering the CCD. The infrared ray enters the lens for imaging after being reflected by the object. The power supply of the infrared camera is low, and the infrared ray used is divided into two types: near infrared ray or short wave infrared ray, with a wavelength of 0.76-1.5 μ m, penetrating deep into human tissues, about 5-10 mm; Far infrared ray, or long wave infrared ray, with a wavelength of 1.5~400 μ m, is mostly absorbed by the surface skin, and the depth of penetration through the tissue is less than 2 mm. Enhance night image capture capability. One thing to add here is that infrared rays cannot be seen with the naked eye. You usually see red light on the camera, which is a photoresist.
Security monitoring camera 6: explosion-proof
Explosion proof camera is an explosion-proof monitoring product, which is the cross product of the explosion-proof industry and the monitoring industry. Because conventional camera products cannot be used at high-risk flammable and explosive sites, only products with explosion-proof functions and relevant certificates issued by national authorities can be called explosion-proof cameras., Many readers can't distinguish between explosion prevention and riot prevention, and even apply riot prevention products to areas with high flammability risk. This practice has a high risk factor, even causing serious damage to personal and property caused by explosion. Anti riot is anti violence, anti destruction, or anti strike. This kind of product has a relatively hard shell, but does not have explosion-proof electrical performance and certification. These are two products with different properties.
