Three ways to improve the imaging quality of low-lightness surveillance cameras

In addition to the most original increase in fill light or infrared light, the use of large target CCD (the method commonly used in megapixel camera), the long-term to improve the effect of low-light imaging means nothing more than the following.

Select high-sensitivity CCD, the current camera mostly uses two series of CCD, one is Sony's SUPERHADCCD series, the other is Sony's EX-VIEWHADCCD series. EXVIEWHADCCD increases the aperture ratio of each pixel of the CCD, which in turn lowers the illumination. Technical Information Introduction The low illumination of the EXVIEW HADCCD is 4 to 6 times that of the SUPERHADCCD, and it actually improves.

· Color-to-black technology is currently used in many applications and can be used in conjunction with infrared lamps. There are two kinds of conversion technologies. One is to use infrared filters and switching circuits for color/black-white conversion; the other uses electronic circuits to filter out color signals without the need for infrared filters. High-end color black cameras use the former switching technology to ensure color reproduction and clarity;

· Frame Accumulation (Slow Shutter) technology, but the start of the slow shutter makes the real-time performance of the image worse, resulting in serious tailing phenomenon, so it is only suitable for static location monitoring, and should not monitor the target moving speed faster;

· Digital noise reduction technology, from the perspective of digital noise reduction performance of some high-end low-light cameras, can improve image cleanliness and clarity in the case of low noise (especially when AGC starts) In order to enhance the low-light imaging effect, many cameras still suffer from tailing and animation problems after the noise reduction function is activated.

From the above list, it can be concluded that the way to enhance the imaging effect under low illumination is mainly from two aspects: one is to improve the performance of the CCD itself; the second is to increase the internal image processing capabilities of hardware and software.