新浪博客

★云南 冯瑶
Police officers often use fingerprints(指纹) successfully to catch criminals(罪犯). However, in the US, 1,000 incorrect fingerprint matches are made each year.
Anil K. Jain, a computer scientist, and his workmates are trying to improve computer systems for making accurate (精确的) fingerprint matches. The work is important because fingerprints are useful not only in crime solving (解决) but also in our daily life.
Different prints
 Everyone's fingerprints are different. In the late 1800s, police in Britain started using fingerprints to help solve crimes. In the US, the FBI started it in the 1920s. In those early days, police officers collected fingerprints with ink. Today people press their fingers on electronic sensors (电子感应器). The sensors scan (扫描) their fingertips and store them in computers.
Looking for a match
 US police collect fingerprints at crime scenes. Then they put them in FBI records and search for matches. But fingerprinting is not an exact science. Prints left at a crime scene are often incomplete. And our fingerprints are always changing in some ways. Sometimes they're wet, dry or damaged (毁坏). That's why researchers are trying to find better ways to collect fingerprints.
Getting in
 Fingerprint scans can also play a role in our daily life. At the door of Jain's lab, for example, researchers swipe (挥动) their fingers across a scanner to enter. They don't need a key. Some grocery stores (食品杂货店) are using fingerprint scanners. That way, customers pay faster and more easily. In schools it helps the school find library books and helps students get food more quickly.
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Keys: 1. the 1920s 2. ink 3. In schools, grocery stores and police stations. 4. T

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