Four problems of infrared camera night vision monitoring system
â—† The problem of focus shift Due to the different wavelengths of visible light and infrared light, the imaging focus is not on a plane, which results in a clear image under daytime visible light conditions, but blurry under night infrared light conditions, or clear image under night infrared light conditions, daytime visible light conditions The image below is blurred. There are three ways to solve it. First, the use of an autofocus integrated camera; second, the use of IR dedicated focus non-offset lens; third, the use of professional adjustment tools, can also achieve no offset under existing lens conditions.
â—† Color problems All black and white cameras are sensitive to infrared light. Infrared light is a kind of stray light for color cameras under visible light conditions, which will reduce the clarity and color reproduction of color cameras. The filter of color cameras is to prevent infrared from participating in imaging. There are two ways to make the color camera sense infrared. First, switch the filter to block the infrared from entering under visible light; remove the filter to allow infrared to enter when there is no visible light. The image quality is good, but the cost is high and the switching mechanism will cause a certain failure rate. Second, open a specific infrared channel on the filter to allow infrared light with the same wavelength as the infrared lamp to come in. This method does not increase the cost, but the color reproduction is slightly worse.
â—† The problem of sensitivity Camera sensitivity is the core part of infrared night vision monitoring. The better the sensitivity, the stronger the ability to sense infrared. Of course, the better the sensitivity, the more expensive the camera. Generally speaking, it is better to choose a camera with 0.1 lux for infrared night vision systems within 50 meters; a night vision system with a range of 50 meters to 100 meters should use a camera with 0.01 lux; Above the camera. Of course, as the sensitivity increases, the price of the camera will increase significantly.
Of course, as with many other products, the phenomenon of the camera's false standard index is particularly serious. I once compared a 0.1 lux camera with a nominal 0.0001 lux camera. The latter is not as good as the former. More camera manufacturers artificially increase the signal strength, and the sensitivity is very good, but the signal-to-noise ratio is very poor, resulting in a lot of "snow dots" at night.
â—† The problem of distance One hundred people make infrared products, there will be one hundred infrared night vision distance standards. I think it should still be based on the customer's application effect. What is the customer's standard? It's a clear person! What are the "visible distance" and "discovery distance" are ambiguous. The matching between cameras and lenses of different grades may have different sensitivity to the light emitted by the same infrared lamp, and the viewing distance may also differ greatly. Therefore, it is not very scientific to say that a certain infrared lamp is specifically how many meters. The working distance of an infrared lamp can only be determined by matching with the camera and lens of a certain quality. Also, because the application environment is different, the effect will be very different, it is best to leave a certain margin.
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