The stories speak for themselves
February 16th, 2011
The Economist: Just the interesting bits

A quick way to find incidents recorded by security cameras

Video cameras are popping up everywhere. On a typical day out in a big city a person could be filmed by hundreds of closed-circuit television (CCTV) cameras. The combined output of all these systems is far greater than the capacity of security staff to watch all the images. So various ways are used to automate the process.

Some systems work in ?real time? to alert security staff to a potential incident being filmed by a camera. Such systems can read number plates on cars and identify certain faces. Several use powerful algorithms to detect suspicious behaviour, such as a group loitering near a door where entry is barred or an item of luggage that seems to have been left unattended.

Then there is the task of searching through a mass of recorded images to see if anything has happened…[Read more…]