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The Four Major Problems Of Infrared Camera Night Vision Surveillance Systems

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#1 iacemomo

iacemomo

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Posted 19 November 2012 - 01:32 AM

The four major problems of infrared camera night vision surveillance systems
Focal shift of the problem
The visible and infrared light having different wavelengths, the imaging focus is not on a plane, resulting in image clarity in the daytime under visible and infrared night light conditions blur, or the image is clear infrared night light conditions, the image blur in the daytime under visible. Three solutions. First, the use of auto-focus camera integration; second, by IR focus does not shift lens; professional adjustment tool can also be achieved in the existing lens under the conditions do not offset.
Color problem
All black and white cameras are sensing infrared light. Infrared light under visible in terms of the color camera is a stray light will reduce the clarity and color reproduction of the color camera, color camera filters is to prevent infrared participate in imaging. Now there are two approaches in order to make a color camera sensor infrared, first, switch the filter, blocking the infrared rays to enter under visible; remove the filter in the non-visible light under conditions, let Infrared into such programs to obtain The image quality is good, but the cost is high and the switching mechanism will lead to certain failure rate. Second, the filter on a specific infrared channel opens, allowing the same wavelength infrared lamp infrared light came, this approach does not increase the cost, but slightly worse color reproduction.
The sensitivity of the issue
The sensitivity of the camera is a core part of the infrared night vision surveillance. Sensitivity as possible, the stronger infrared sensing capability. Of course, the sensitivity of the better camera prices are also more expensive. In general, less than 50 meters infrared night-vision system, the selection of 0.1 lux camera is better; 50 meters to 100 meters range night vision systems should use 0.01 lux camera; night vision system should be used more than 100 meters of 0.001 lux above the camera. Of course, as the sensitivity is increased, the price of the camera there will be a larger increment.
Of course, and many other products, the camera xubiao indicators phenomenon is particularly serious. I had won a 0.1 lux camera and a nominal 0.0001 lux camera for comparison, which is actually better than the former. More camera manufacturers to artificially increase the signal strength, the sensitivity is very good, but the signal-to-noise ratio is poor, resulting in images at night "snow point" A lot of great.
Distance
Hundred men to do the infrared products there will be one hundred standard of infrared night vision distance. I think, or as a standard should be based on the customer's application effect. What is the standard of customer? Is to see the people! "Visual distance", "found that the distance" these uncertain to say is vague. The match between the different grades of cameras, lenses, light sensitivity may be issued for the same light infrared lights many times difference, viewing distance can also be a lot of difference. So, as certain light infrared lights specifically say how many meters is not very scientific. The role of an infrared lamp distance can only determine the quality of the camera and lens to match in order to determine its role in distance. Because of different application environment, the effect will be very different, it is best to leave some margin.





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