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When a swimmer sinks towards the bottom of the pool, the new system sends an alarm signal to a poolside monitoring station and a lifeguard's pager. In trials at a pool in Ancenis, near Nantes, it saved a life within just a few months, says Alistair McQuade, a spokesman for its manufacturer, Poseidon Technologies.
Poseidon keeps watch through a network of underwater and overhead video cameras. AI software analyses the images to work out swimmers, trajectories. To do this reliably, it has to tell the difference between a swimmer and the shadow of someone being cast onto the bottom or side of the pool. "The underwater environment is a very dynamic one, with many shadows and reflections dancing around." Says McQuade.
The software does this by "projecting" a shape in its field of view onto an image on the far wall of the pool. It does the same with an image from another camera viewing the shape from a different angle. If the two projections are in the same position, the shape is identified as a shadow and is ignored. But if they are different, the shape is a swimmer and so the system follows its trajectory.
To pick out potential drowning victims, anyone in the water who starts to descend slowly is added to the software's "pre-alert" list, says McQuade. Swimmers who then stay immobile on the pool bottom for 5 seconds or more are considered in danger of drowning. Poseidon double-checks that the image really is of a swimmer, not a shadow, by seeing whether it obscures the pool's floor texture when viewed from overhead. If so, it alerts the lifeguard, showing the swimmer's location on a poolside screen.
The first full-scale Poseid6n system will be officially opened next week at a pool in High Wycombe, Buckinghamshire. One man who is impressed with the idea is Travor Baylis, inventor of the clockwork radio. Baylis runs a company that installs swimming pools—and he was once an underwater escapologist with a circus. "I say full marks to them if this works and can save lives," he says. But he adds that any local authority spending ￡30,000— plus on a Poseidon system ought to be investing similar amounts in teaching children to swim.
AI stands for ______
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How does Poseidon save a life？
It will be impossible to make weather forecasts using the analog method ______
Human beings are animals. We breathe, cat end digest, and reproduce-the same life【71】common to all animals. In a biological laboratory, rats, monkeys, and humans seem very much the same.
However, biological understanding is not enough:【72】itself, it can never tell us what human beings are.【73】to our physical equipment—the naked human body—we are not an【74】animal. We are tropical creatures,【75】hairless and sensitive to cold. We are not fast and have neither claws nor sharp teeth to defend ourselves. We need a lot of food but have almost no physical equipment to help us get it. In the purely physical【76】, our species seems a poor【77】for survival.
But we have survived—survived and multiplied and【78】the earth. Some day we will have a【79】living on the moon, a place with neither air nor water and with temperatures that turn gases into solids. How can we have done all these things？ Part of the answer is physical.【80】its limitations, our physical equipment has some important【81】. We have excellent vision and hands that can【82】objects with a precision unmatched by any other【83】. Most importantly, we have a large brain with an almost【84】number of neural【85】.
We have used this physical equipment to create culture, the key to our survival and success. If we live in the Arctic. we supply the warmth our tropical bodies need【86】clothing, shelter, and【87】heat. If a million people want to live in a desert that supplies natural food for only a few hundred, we find water to grow food and【88】deficits by transporting supplies from distant places. Inhabitants of our eventual moon colony will bring their own food and oxygen and then create an artificial earth environment to supply necessities. With culture, we can overcome our natural limitations.
It was not always【89】. 0ur distant ancestors were just animals, faced with the limits of their physical equipment. They had no【90】and lacked the physical capacity to use it.
(41)
A．Apart fromB．With regard toC．With the exception ofD．In spite of
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