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High-sensitivity CCD is used. At present, most of the cameras use two series of CCDs. One is Sony's SUPPERHADCCD series, and the other is Sony's EX-VIEWHADCCD series. The EXVIEWHADCCD increases the aperture ratio of each pixel of the CCD to achieve lower illumination. Technical Information Introduction The low-light effect of EXVIEWHADCCD is 4~6 times that of SUPPERHADCCD, and it actually does improve.
· Color-to-black technology, currently using this technology, can be used with infrared light. There are two conversion technologies, one is to use infrared filters and switching circuits for color/black-and-white conversion; the other is to use electronic circuits to filter out color signals without the need for infrared filters. High-end color-to-black cameras often use the former switching technology to ensure color reproduction and clarity;
· Frame accumulation (slow shutter) technology, but the slow shutter start makes the image real-time deteriorating, causing serious tailing phenomenon, so it is only suitable for static location monitoring, and it is not suitable to monitor the target moving speed faster;
·Digital noise reduction technology, from the digital noise reduction performance of some high-end low-light cameras, can improve the image cleanliness and clarity in the case of excessive low-light noise (especially when AGC starts) This will improve the low-light imaging effect, but many cameras will still have tailing and animation problems after the noise reduction function is activated.
From the above simple list, it can be concluded that the way to improve the imaging effect under low illumination is mainly from two aspects: one is to improve the performance of the CCD itself; the other is to increase the image processing capability of the internal software and hardware.
[ Huaqiang Security Network News ] The birth of surveillance cameras provides a great guarantee for people's safety, but in the process of use, there will be unclear pictures, which gives the criminals a chance. How to solve these problems? The following is the information collected by the author. In addition to the most original addition of fill light or infrared light, the use of large target CCD (this method is commonly used in megapixel cameras), the long-term means to improve low-light imaging results are nothing more than the following.