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DVR Security Cameras

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DVR security cameras are the new standard of CCTV surveillance. They transmit a 5:1 ratio compressed signal, although higher compression may be used to obtain DVD quality.

Original security cameras were analog, sending their signal to a videotape recorder. DVR security cameras, though, transmit the signal in the form of a digital signal to a dedicated hard drive or DVR security camera recorder.

DVR security cameras one-up their analog counterparts in terms of options. While both analog security cameras and DVR security cameras contain options such as motion detectors and night vision, DVR security cameras offer more options on how to view the material itself. Digital feed can be viewed more easily than similar feed on videotape, and viewers can easily leap to a certain point in the feed.

However, the digital format does have some problems. A high compression rate can quickly take up space on a hard drive. Some DVR security cameras have worked around this by using motion detectors to alert the cameras when to take pictures with a high compression rate, and when to drop to a lower compression. DVR security cameras may also suffer from image distortion, which may occur unless the cameras are calibrated during their setup. This is unfortunately ignored by users who focus too strongly on the "plug-and-play" aspect of the devices, and less on proper adjusting.

Another problem with DVR security cameras is their output. Without a standard output, DVR file types vary widely, with differing degrees of assistance. Some DVR security cameras require that a codec be installed to view the files. Some require that a separate media player be installed. Other DVR security cameras are more helpful, and provide their own media player in order to view the files.

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