Video surveillance has been around since early 1960s when law enforcement agencies first used closed-circuit TV cameras to monitor criminal activity. The basic principle of video surveillance remains the same today, but what goes on behind the camera is quite different from what used to be just a guard watching a monitor. Digital and internet-based video technology has made it more sophisticated and cheaper to set up and maintain surveillance systems.
Any surveillance system starts with the cameras. Cameras contribute greatly to the security and safety within a company's premises. That's why cameras should have adequate resolution for human operators to pick out vital information, like the identity of a person or the numbers on a license plate. They must also be able to capture the entire space that you want to monitor, either by moving around or having a wide, stationary view.
Many companies are already using modern video surveillance systems that let human operators monitor live scenes remotely and save them for later review. Recent advances, like video analysis and adaptive learning surveillance software, promise to expand coverage and further reduce costs while delivering capabilities that greatly improve security. Of course, the capabilities of such recent technologies greatly depend on the hardware on which it runs. That's why surveillance hardware needs to keep up with advancements in software.
Most surveillance setups involve a combination of hardware, like analog and digital cameras, along with the servers to store, play, transmit and analyze video. Many companies use a combination of analog and digital cameras because the demands on computing power make it difficult to employ high-end video analysis on a broad scale. A single server won't be able to handle simultaneous analytics for more than seven cameras.
To bridge the analog/digital gap, encoder devices may be used. This is of great importance to a lot of video surveillance systems because analog equipment can be too expensive to replace all at once. However, even if their images can be converted to digital format, analog cameras lack many of the features common in digital cameras. For one thing, you will be unable to zoom in for detail.
Digital has another characteristic that makes it better for video surveillance systems. Analog's NTSC platform employs an interlacing that draws the video in alternating lines, while digital employs progressive ones. These progressive lines are the top-to-bottom, linear painting of an image familiar to anyone who frequently watches DVD movies. With digital cameras, you won't get the little bit of tearing you will find in analog video that reduces your ability to identify persons and objects.
Digital is definitely the way to go with wireless security systems. Learn more about it at securitysales.com/articles/list/mostpopular.aspx.
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Orignal From: Going Digital - The Best Way to Go with Video Surveillance
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