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Two types of image sensors are used in cameras today, CCD and CMOS. However, for most home security applications 380 TVL is sufficient.
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Professionals need a 500 TVL or higher, perhaps, to read the number of a license plate on a moving car. For color, standard resolution is a minimum of 330 TV lines and high resolution 480 TV lines or higher.
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Standard resolution for a B & W camera is perhaps 380 TV lines and a high resolution might be 550 TV lines or higher. Resolution for cameras is expressed in TV horizontal lines. IR LEDs, usually on the camera itself, provide illumination and if a color camera, at night, the camera will switch to monochrome and is, therefore, essentially a 0 Lux camera for the distance of the IR LEDs. Decent color cameras often will have a 2 Lux or lower rating and monochrome (B & W) cameras often under 1 Lux.Ī great way to handle night vision problems is with IR lighting. A typical office environment might have 500 Lux whereas a residential street lighting might be 0.5 - 3 Lux. Light levels for cameras are usually measured in Lux, which is a measurement of light energy on a surface. The key items to know about the camera are whether indoor or outdoor application, amount of available light for the camera to see, needed resolution of the camera, and last, wireless or hard wire from the camera to the monitor. The basic surveillance system is comprised of the camera, lens, and monitor, and if recorded video is needed, then a recording device, such as a VCR or a DVR. This brief article is designed to acquaint the average homeowner to some of the key concepts and terms that might be helpful for a simple home surveillance system. Although there are many articles on CCTV and surveillance systems, most are for the professional integrator and most are for commercial, industrial or government applications.