High-altitude observation video surveillance image sensor technology

With the advancement of image sensor technology (high-altitude surveillance) and the application of image noise reduction algorithms, the low-light effect of high-definition network cameras is getting better and better. Unlike infrared, it can use all surrounding light sources, such as street lamps and corridor lights. , moonlight and even starlight, etc., to obtain full-color real-time video images in low light conditions. Due to the ultra-flexible image sensor, as well as the unique electron multiplication and noise control technology, the flexibility of the camera can be greatly improved, and it has 24-hour full-color real-time effects without the smearing phenomenon of ordinary low-light cameras. Meet the demand for high-quality monitoring at night. Its advantages are low power consumption, real image effect, and no color cast. In terms of application, although it is not as common as infrared cameras, it is also irreplaceable to a certain level. In order to solve the problem of night monitoring in high-altitude parabolic video surveillance, it is recommended to use "starlight-level" cameras. Wide Dynamic Range Wide dynamic range is a technology used to allow the camera to see the characteristics of the image under very intense contrast. When high-brightness areas under strong light sources (sunlight, lamps or reflections, etc.) and relatively low-brightness areas such as shadows and backlights exist in the image at the same time, the image output by the camera will show bright areas that become white due to overexposure. The dark areas become black due to lack of exposure, which seriously affects the image quality. There is a limit to how a camera can perform in the brightest and darkest areas of the same scene, and this limitation is commonly referred to as "dynamic range". Objects in the field of view of conventional cameras need to look at objects outside the door or window when the background light is high in brightness, usually in the form of central backlight compensation (BLC). Local brightness to achieve the purpose of seeing objects in the central position. The WDR technology is to expose twice at the same time, one fast and one slow, and then stop compositing so that bright and dark objects on the screen can be seen clearly at the same time. Although both are measures to restrain the purpose of seeing clearly under strong backlight conditions, but the backlight compensation is at the expense of the contrast of the picture, so in a sense, the wide dynamic technology is backlight compensation. promotion. The wide dynamic range of the CCD camera is only 66dB at most, while the dynamic range of the CMOS wide dynamic camera can reach more than 120dB. In the future, the CMOS wide dynamic technology will have more room for development. High-altitude parabolic surveillance cameras sometimes face the sky, and sunlight may directly hit the lens, so cameras with a wide dynamic range are required. With the increasingly severe smog weather in China, many traditional surveillance cameras have lost their monitoring functions. The smog has caused the monitoring interval of the cameras and the reduction of image clarity, and even caused the key details of the monitoring subjects such as vehicles and people. Loss of information, once something happens, it will be difficult to obtain effective information, which greatly reduces the applicability of the video surveillance system. Nowadays, the fog-penetrating technology has become the standard function of the camera. Whether it is using electronic fog-penetrating technology or optical fog-penetrating technology, it can penetrate fog and haze interference in hazy weather, allowing the camera to obtain good monitoring. The effect will not affect the monitoring interval and image clarity. High-altitude parabolic surveillance cameras should also have the function of penetrating fog, so that they can show their magical powers in the increasingly severe haze weather.
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