The SW creates, effectively, a video synopsis…
“At the first stage, we separate automatically the moving objects from the static background,” Peleg explained. In this case, the software identifies the people entering and exiting the building.
The software then replays the scene as if the people moved through the area simultaneously.
“We pack as many objects as we can from as many different times as we can, so that we can see all the objects and all the activities in as short as possible time,” he said.
The summarized surveillance video from the office building, for example, compresses about two hours of activity into just a minute and a half.”
http://www.theworld.org/2013/05/video-software-compresses-time-aids-police/
and more samples here
https://www.youtube.com/user/BriefCamVS
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