Before conducting low illumination night vision surveillance build and product selection, you need to first understand the classes and characteristics of low illumination and night vision applications, only to master the characteristics of these categories in order to make the best used
Low-light cameras generally refers to a function without auxiliary lighting to be able to identify targets under low illumination environment surveillance cameras, its principle is to use camera photosensitive components Sensor, image processing units ISP / DSP and lens optical effects together to achieve low-light video surveillance, make good use of the underlying key technologies, low illumination and night vision surveillance applied to produce the actual performance, and its implementation is not the only broadly consists of the following categories.
The most commonly used low-light high sensitivity mode (Low-Light Mode) also referred to as low-light full-color mode, most of this type of night ip camera using Super had Ex-view/EXTRA-View CCD or back-illuminated COMS photosensitive group parts, good visible and near infrared light reaction in low illumination environment, the camera application of this technology is also called a 24-hour surveillance camera. Usually it's the color mode of the low-light illumination of up to the 10-2Lux, showing up in black and white 10-3Lux with infrared auxiliary lighting can be used under 0 Lux, but the latter two cases the illumination does not constitute Low-light that low-light color conditions requirements and mode. The screen that appears when this surveillance cameras can clearly recognize a video, better in low light conditions to maintain a certain level of noise values ??to render a color screen, and there is no light accumulating low according to the display through the shutter slow delay streaking .
The most convenient day color / night black and white mode (Day / Night Mode), also known as day and night mode, which uses the principle of electro-mechanical, day and night ip camera in the market has gradually become the mainstream. Day and night ip camera performance of minimum illumination in color 10-2Lux and ICR on 10-3 ~ 10-4Lux mode when the black and white to mark 0Lux this marked almost no sense, and therefore used in day and night under low-light night vision monitoring must be specified. This camera uses a black and white image of the infrared sensitivity characteristics, the use of electro-mechanical circuit switching filter ICR Cut or switch to black and white signal in a particular light conditions, that after the induction infrared image from color to black and white mode. Color / black-and-white line conversion process, due to the elimination infrared filter makes the picture imaging focus is changed, it must be used with IR lens, day and night imaging focal length to be consistent in order to avoid the image the fuzzy focal length and color performance is not correct shortcomings. Therefore, although the trend of this type of night ip camera already has a wide range of applications, but with an additional IR lens resulting in increased costs that disadvantage can not be avoided, but strictly speaking, this model is not the best low illumination and night vision applications.
Infrared auxiliary lighting mode (IR Illumination Mode), also known as the infrared ip camera (IR Camera), with the exception of day and night ip cameras other than the best kind of low illumination and night vision applications, it can be divided into the camera built-in infrared light and the plug-in infrared auxiliary projection lamp two. CCD and CMOS Sensor photosensitive components can sense the most visible and infrared spectral range, infrared light auxiliary lighting Image Sensor sensor clearer images at night without visible light illumination. Camera photosensitive components have a higher sense of light sensitivity than color mode to black and white mode, it can be taken in a dark environment to a sharper image, so do of 0Lux environmental conditions monitoring applications in infrared light auxiliary lighting. In addition, through the the photoresistor automatic point off the device, with black and white or day and night ip camera can also choose to increase the low light and night vision surveillance applications.
The riskiest slow shutter mode (Digital Slow Shutter) DSS electronic slow shutter, so that a large number of light through the aperture shutter accumulated a higher screen illumination, also known as light or frame accumulation. Kind of frame accumulation camera using slow shutter technology will be more significant because of insufficient lighting fuzzy picture is built up to form a clear picture of an image. The premise aperture of f1.2-1.4, the screen can accumulate sufficient illumination frames, this technology can reduce the camera illumination to 10-4Lux. However, this technique is only applicable to fixed ip cameras, and requires constant changes in ambient light, otherwise easily lead to the image smear delay, static monitoring sites suitable for disabled infrared or projection lamp. The above four categories of products can be used as a low illumination night vision surveillance Selection mode based on user selection of reference accordingly related products.