In recent days, most of the cities have been filled with heavy fog due to severe air pollution. A fog on January 3 caused the cancellation of 440 flights to Kunming airport. Nearly 10,000 people were stranded. The airport still had a large area of ​​flight delays the next day, resulting in emotional excitement among the stranded passengers and frequent chaos and conflict. Today, Beijing is also filled with heavy fog, and traffic jams at the main intersections in the urban areas are extremely serious. It seems that this kind of fog weather does have a very big impact on everyone’s travel. From the point of view of security monitoring, the fog camera can exert its advantages in such bad weather.

In fact, the development of fog cameras is also a hot spot in the past two years. Fog cameras are cameras that can penetrate fog and capture clear images. However, in terms of practical application, this "permeability" can also penetrate dust, water vapor, and small obstructions (such as slight contamination of transparent covers and rain). Ordinary cameras in these harsh environments will suffer from a significant drop in image quality or even fail to capture images of surveillance targets. Fog cameras are often used in these situations.

Fog camera development history

The fog-mist camera is a professional camera developed in recent years. The earliest fog-transmitting system has only the electronic part, and it is precisely the image optimization processing system. The back-end PC mainly performs the limited optimization processing on the blurred image to reproduce the scene. With the development of DSP technology, people once again made the image optimization system on the PC into a single running program and solidified it into the DSP chip. This is called digital fogging because pure digital fog will not change the color. Also called color fog. This is the bud of the fog camera, but the improvement of the camera by this camera is very limited. Later, with the continuous exploration of optical systems, scientists discovered that different wavelengths of light have different penetrating power in fog. Researchers have applied this feature to the lens to selectively allow certain wavelengths of light to pass through. The quality of the image was better than that of a normal lens, so a fog lens was born, but the lens of the fog lens was very expensive. In order to reduce costs, the researchers transplanted the optical system to the camera. Since then, the ordinary non-penetrating camera can achieve good image quality as long as it is used with a fog camera. This is the origin of the ordinary fog camera. However, at this time, the fog camera is still very expensive compared to the ordinary camera. At the same time, the inconvenience of operation makes the ordinary user prohibitive. Since then, the development of the fog camera has encountered a bottleneck.

However, with the continuous development of the security market, the market places high requirements on the fogging technology of surveillance cameras. Therefore, the development of fog cameras is now faced with both opportunities and challenges.

Fog camera technical characteristics

In fact, although the name of the fog-mist camera is called “transmist”, it is technically obvious that it is not only simpler than fog. The birth of fog camera can not only solve the problem of extreme weather monitoring, but also open the gap for all-weather cameras, so that it can achieve all-weather high-definition monitoring under any circumstances.

This is mainly due to the fact that wide dynamic enhancements have been implanted in fog cameras. Due to the lighting conditions at night, the camera's lighting environment is much more complex than during the day. Therefore, it is necessary to strengthen the DSP during night surveillance. The fog camera also uses night-vision enhancement to enhance the monitoring effect. In addition, the smart edge sharpening intelligent video signal processing technology automatically adjusts the color contrast and highlights, which are not compatible with common surveillance cameras.

All in all, the fog camera not only retains the basic monitoring skills, but also combines the wide dynamic and night vision infrared functions, and is equipped with intelligent video signal processing technology, combining the three major parts of the whole together perfectly. A fog monitoring camera was formed. It can be seen that our demand for fog cameras is still very large.

Fog Technology - Provides High Definition for Complex Environments

At present, many security companies have introduced fog-mist cameras. Although the market application needs are not the same, the overall structure and functions are almost the same. Faced with the increasing demand for high-definition, high-definition monitoring of fog-mist cameras has become a must. In general, the fog camera adopts super sensitivity sensor 1/2′′SONYExwaveHadII generation or 1/3′′SONYSuperHadII generation CCD, so that the black and white infrared mode clear imaging, the necessary filter can effectively guarantee the night high sensitivity The infrared absorption capability, light auto-adjustment and contour correction function make the imaging effect clearer.

In addition, the components of the fog-mist camera can effectively achieve a clear perspective effect in fog and haze, and can achieve high-definition shooting at a relatively long distance. Nowadays, there are many products that have correspondingly achieved the introduction of the fogging function. For example, the new B2DSP chip from Samsung Tyco Group has advanced processing technology, which can provide users with high performance-price ratio while integrating powerful processing features. The effect of video surveillance ensures that the user can obtain the best image quality in different application areas. In the fogging technology, this camera can recognize the concentration of fog in the target scene through its unique optical processing technology. The defogging adjustment is carried out on rainy days, ashes and other bad weather to restore a clear monitoring scene and bring the best video surveillance results to users.

Differences in Different Brand Fog Cameras on the Market

The fog-transmitting cameras introduced by major manufacturers are mainly evolved from the fog lens. The difference in structure and function is not obvious. The fog quality is similar to that of pure fog. Generally, it mainly includes digital image enhancement systems and optical images. The processing system, but these two systems are operated independently, do not affect each other, so most of the fog-mist camera systems often specify the RS485 remote control function when bidding. This means that the administrator must pay attention to the change of the monitor image at every moment. When one person manages a large monitoring area (multiple images), it is even more embarrassing, because people's eyes cannot pay attention to the details of multiple monitors at the same time. , resulting in many times the lack of important images. Some administrators open the fog-transmitting mode for a lazy 24 hours, but due to the optical characteristics of the fog camera, the colors are almost completely lost. This is unacceptable to some customers. This embarrassing situation was not broken until the launch of the fully automatic intelligent fog camera. This kind of fog camera adds a system-intelligent image analysis system, and carries out a lot of actual sampling and simulation of various real environments such as fog, dirt, and rain, and uses fuzzy intelligent image analysis algorithms to analyze and determine the image. With the combination of high-performance DSPs, it is difficult to grasp the fog camera, difficult operation, poor fog and other ills.

In practical applications, the fully automatic intelligent fog-clearing camera can be put into use as soon as it is initially commissioned according to the site environment, and the operation is stable. Due to the automatic fogging mode, the camera automatically analyzes the image for fogging or water vapor, dust, dirt, and other abnormalities and opens the preset fogging mode in real time, and intelligently links the digital image enhancement system with the optical fogging system. , to ensure that the image is clear and thorough. Since then, monitoring administrators no longer need to keep an eye on the screen 24 hours a day, greatly liberating manpower, allowing the actual monitoring efficiency to improve several levels.

Fog camera application prospects

The application of the fogging camera was mainly in the military. It compensated for the limitations of the thermal imaging system, and it won the favor of the military with clear and thorough pictures and perfect imaging site details. With the rise of environmental protection awareness, many countries have attached importance to forest and hydrological monitoring systems. Fog cameras have obtained a very suitable application and have begun to develop rapidly.

Fog cameras are widely used in forest fire prevention, hydrological monitoring, coastal monitoring, border defense, battlefield investigation and observation, oil and gas mines, ports, city monitoring, road monitoring, aerospace and other occasions. With the continuous advancement of modern network technologies and remote sensing technologies, and the continuous reduction of costs, fog-fog cameras will be applied more to the civilian market, such as the active safety defense of vehicles. In the future, the fogging function will become a widely used function as an ultra-wide dynamic function.