CCTV cameras
Information about CCTV camerasfrom XJA Systems & Consulting.
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CCTV cameras are using in recording video surveillance.
CCTV cameras can be full motion video or they can be digital stills cameras.
Video versions of CCTV cameras can record straight to a video tape in an analog based system. The difference between this tape recorder and a normal VCR is that the tape rolls at a very slow speed. Since all video tapes are created equal and we want the CCTV cameras to send 24 hours of footage to a single 3 hour tape, the tapes in this system are set to usually record about 4 frames per second instead of the 24 frames per second the VCR usually tapes at. Ever watch those TV shows or news casts where people seem to jump all around the screen? It's because the CCTV cameras are only recording 4 frames per second which can miss a lot of detailed action. CCTV cameras can also record digitally however. When coming CCTV cameras with a security DVR we can tape seamless digital video for as long as you have digital storage space. If your budget allows it, digitally recording CCTV cameras is the best way to truly be secure. CCTV cameras aren't always video however as mentioned earlier. As an example, traffic cameras are in fact, CCTV cameras that capture still images. Some red light CCTV cameras will only record an image when the trigger event occurs, such as someone running a red light. At that point, the digital signal from the CCTV cameras is stored directly to a computer. CCTV cameras are most powerful when used in a network. That way you can have several CCTV cameras monitor several angles of the same room, or you can have even more CCTV cameras monitoring an entire building. With a network, multiple format CCTV cameras can be used at different points for different reasons. |