Constant companions: Cameras that think

These so-called intelligent devices are helping prevent and detect crime

The fast-moving world of crime can sometimes be like a game of cat and mouse, and often the hardest part is working out who exactly are the cats and who are the mice.

It is generally only a matter of time before the villains, put on the back foot by the latest piece of crime detection equipment, manage to up the ante and get hold of the equipment themselves, thus setting the forces of good into a search for something even better. And, of course, vice versa.