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  3. Pool Watch Swimmers can drown in busy swimming pools when lifeguards fail ...

Pool Watch Swimmers can drown in busy swimming pools when lifeguards fail ...

admin2020-12-24  52
问题 Pool Watch
Swimmers can drown in busy swimming pools when lifeguards fail to notice that they are in trouble. A report says that on average 15 people drown in British pools each year, but many more suffer major injury after getting into difficulties. Now a French company has
developed an artificial intelligence system called Poseidon that sounds the alarm when it sees someone in danger of drowning.
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 （呼机）. In trials at a pool in Ancenis, near Nantes, it saved a life within just a few mon this, says Alistair McQuade, a spokesman for its maker, Poseidon Technologies.
Poseidon keeps watch through a network of underwater and overhead video cameras. AI software analyses the images to work out swimmers’ trajectories （轨迹）. 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.
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” （预先警戒） list, says McQuade. Swimmers who then stay immobile on the pool bottom for 5 seconds or more are considered in danger who the of drowning. Poseidon double-checks that the image really is of a swimmer, not a shadow, by seeing whether it obscures （使模糊）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 Poseidon 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 （时钟装置） radio. Baylis runs a company that installs swimming pools — and he was once an underwater escapologist （脱身杂技演员） with a circus （马戏团）.“ I say full marks to them if this works and can save lives,” he says.

How does Poseidon save a life?
选项 A It orders an underwater robot to rescue the drowning swimmer.
B It alerts the lifeguard.
C It displays the swimmer’s shadow on the screen.
D It watches the pool through dozens of overhead cameras.
答案B
解析
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