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PCs today are increasingly used in conjunction with video management software to record video feeds from network cameras. However, this form of centralized processing represents a bottleneck and generates a substantial network load. This is because images have to be transmitted to the central PC for evaluation, even when no events are captured. By contrast, new "smart" network camera systems with integrated PCs reduce the network load to practically nothing, and there is no limit on the number of these cameras that can be connected to a network.
Network Cameras On The Ascent
Instead of analog video cables, network cameras use TCP/IP — a standard commonly found in IT network technology — to transmit images. This gives them several advantages:
Change of Scenery
As a rule, simple live monitoring is not sufficient in video surveillance. When used for evidence recording or in situations requiring unattended monitoring, scenes must also be tape-recorded. To keep the costs of storage capacity low and to optimize searching through recorded material for events, usually only those sequences are recorded in which changes of scene or motion have been detected. These events do not need to be just recorded, they may need to trigger an alarm as well.
Recording all the important scenes and avoiding unnecessary recordings calls for scene change detection (video motion detection); here, video sensor systems play an important role. Because of the need to document the scene prior to an event or incident (pre-alarm), the recording system also has to be equipped with a circular buffer capable of storing a few seconds of video.