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Hemisphere camera technology features
First, the color reproduction color reproduction refers to the scene after shooting, color photography screen color and the original scene color consistency. The factors affecting color reproduction include the quality of the photographic lens, the color temperature of the light, the performance of the CCD, and the design of the digital signal processing circuit.
Second, ultra-high resolution technology CCD and COMS device as a photosensitive camera analog camera, the horizontal resolution not only depends on the CCD and COMS chip performance, but also with the DSP / ISP digital signal processing circuit design and processing capabilities are closely related. With the advancement of security technology, high-definition surveillance has become popular 4K and H.265 technology has also emerged.
Third, ultra-low illumination technology With the improvement of monitoring requirements, 24-hour monitoring requirements gradually increase. There are more and more "ultra-low illumination" cameras on the market of cameras, and they are implemented in various ways, such as slow shutter frame accumulation technology, dual filter switching day and night conversion technology, and so on.
Fourth, fog engine technology The latest digital signal processing technology, can automatically detect the gray image fog image data, and statistics of the entire area of ​​the image brightness data, via high-resolution image processing algorithms, combined with the image processing chip gray-scale curve transformation, The optimal correction curve and contrast are calculated for each point, the dynamic range curve of the image is adjusted in real time, and the color reproduction degree is enhanced, so as to reduce the original image interference generated by the fog and restore the real image.
V. Automatic Dark Area Compensation (ABS)
Advanced digital signal processing technology can automatically detect the dark part of the image and calculate the brightness data of the whole area. Through the high-precision image processing algorithm, the best correction curve and contrast color can be calculated for each point, and the dynamic range of the image can be adjusted in real time. And dark areas to present the best clear image.
Six, traffic light identification technology, subtle motion detection technology, perform fine detection for high brightness areas of the image, adjust the contrast and color density of the selected image in real time through automatic dynamic selection calculations, and enable intelligent global image detection at the same time. Adding the data of the average brightness, judging the contrast and starting timing, to improve the recognition of traffic lights at night and solve the problem of night traffic signal inversion.
VII. Lightning Protection Lightning strikes usually take three forms: First, a rapid discharge between a charged cloud layer and a certain point on the earth is called "direct strike thunder," and secondly, a "secondary thunder" generated by charged clouds due to electrostatic induction or It is called "inductive mine"; the third is "spherical mine." Lightning strikes often result in damage to the main components of the equipment, the cost of repairs is high, and users have great losses.
Therefore, lightning protection has a great effect on protecting the normal operation of the camera and improving product life. By setting up a lightning protection circuit on the circuit board, it can be ensured that when the lightning strike occurs, the main components of the camera will not be damaged (such as circuit boards and motors). The current generated by a lightning strike is derived from the protection circuit and flows into the earth without entering the camera working circuit, thereby protecting the safety of the circuit and providing greater protection for the user.
VIII. Infrared Detection and Locking Technology Conventional day and night conversion is to experience the visible light intensity of the outside world. When the visible light is lower than the predetermined value, the conversion circuit is started to control the filter action to realize the conversion from color to black and white. When using the camera in an actual low-light environment, the camera may be affected by the external environment and misjudge the ambient illumination (such as the headlights of a car). The black-and-white mode changes to the color mode, but the actual ambient illumination is still relatively low. Low, after the car passes by, the camera will switch back to black and white mode from the color mode again, and the phenomenon of frequent day and night transitions will affect the monitoring effect and reduce the life of the filter switching motor.
A good performance IR dome camera must have the following capabilities:
A. Infrared lamp operating conditions In general, the infrared lamp radiation power is proportional to the forward operating current, but near the maximum rated current of the forward current, the temperature of the device rises due to the heat dissipation of the current, so that the optical emission power decline. Infrared diode current is too small, it will affect the radiated power to play, but the operating current is too large will affect its life, and even make the infrared diode burned. When the voltage crosses the positive threshold voltage (about 0.8V or so), the current begins to flow, and it is a very steep curve, indicating that its operating current requirements are very sensitive. Therefore, it is required that the operating current is accurate and stable, otherwise it will affect the performance and reliability of the radiation power. The increase in radiated power with the ambient temperature (increased ambient temperature due to its own heat generation) will reduce its radiated power. Infrared lamps are particularly long-range infrared lamps. Heat consumption is a problem that should be considered when designing and selecting. Therefore, the use of infrared lamps must have a good constant current power supply, good heat dissipation design B. Infrared light utilization and red storm problems What is a red storm? Redstorm is due to the fact that the emitted infrared light contains visible light components. Infrared lamps can be completely red-free (using 940-950nm wavelength infrared tube) or only a weak red storm.
C. Fogging and Frosting Problems of Infrared Cameras The formation of fog and frost is caused by the condensation of saturated steam in the air, which is condensed into frost and fog due to the strong or weak cold environment. In the work process of infrared cameras, especially outdoor cameras often cause fog or frost on the protective window glass due to seasonal changes, temperature difference between day and night, and rain and snow conditions. As a result, cameras cannot see objects and directly affect the monitoring results.
D. Window Glass Cleaning of Infrared Cameras Infrared dome cameras work in rainy, snowy or dusty environments, and the window glass of the protective cover is prone to dirt, which can block the camera's line of sight. The solution is usually to add a wiper to the hood, and to control the wiper to clean the glass; another option is to use an invisible wiper window glass. Compared with ordinary window glass, invisible wiper window glass has the function of repelling water, dust, and snow.
E. Constant Temperature of Infrared Camera Due to the configuration of the infrared lamp with a large amount of heat, after the infrared lamp is started, there will be heat concentration in the front of the infrared dome camera during the entire working period (in 12 hours). High, if not uniformly cooled, will affect the normal operation of the camera and other components.
F. Fully-enclosed infrared camera In addition to the constant temperature, the other advantage of using an automatic air conditioning system is that the infrared camera can be made fully enclosed, without leaving any cooling holes, preventing the entry of dust, moisture, and corrosive gases, enabling it to To adapt to the harsh environment of dust, such as large coal mines can also be used normally.
Infrared cameras have outstanding advantages such as long-range night vision, strong concealment, and stable performance in surveillance cameras, thus occupying most of the market in CCTV night vision surveillance. With the widening of monitoring applications, hemispherical cameras have been widely used in indoor surveillance because of their advantages such as convenience of installation and debugging, and concealment of surveillance. For example, there are applications where ceilings and light are not changed.