? ? ? ? ? ? ?
? ? ? ? ? ? ? ? ? ? ?
? {{B}}Biological Identification Technologies{{/B}}
? ?When a
person walks, the movement of his head, trunk, and limbs (肢体) are all reflected
in Changes in his body. A computer stores these {{U}}?(51) ?{{/U}} into a
database (数据库). Later, the computer can accurately {{U}}?(52) ?{{/U}} him
according to these changes. This is a new biological identification
{{U}}?(53) ?{{/U}} and it can quickly identify an examinee without
disturbing him.
? ?Everybody’s voice is {{U}}?(54) ?{{/U}}.
When a person’s voice is recorded by an instrument, his voice frequency spectrum
(频谱) is called sound print. {{U}}?(55) ?{{/U}} a fingerprint, everybody’s
sound print is different. How can a computer {{U}}?(56) ?{{/U}} his sound?
First, his voice is recorded, {{U}}?(57) ?{{/U}} allows the computer to
become familiar with his voice. It will then turn his sound characteristics into
a series of digits (数字). These are the {{U}}?(58) ?{{/U}} on which the
computer can distinguish his voice from another’s.
? ?We often
bring ID cards, work cards, or driving licenses with us to {{U}}?(59)
?{{/U}} our identify. If all these cards are forgotten or lost, how can we
prove whom we are? In {{U}}?(60) ?{{/U}} , it’s not difficult to prove
whom you are, {{U}}?(61) ?{{/U}} your body itself has identifying markers.
Some are physiological (生理的) features, such as fingerprints, sounds, facial
(面部的) types and eye color. The computer can {{U}}?(62) ?{{/U}} to identify
you. Suppose your features have already been {{U}}?(63) ?{{/U}} in the
database. To identify you, we have to take your picture with a camera and send
it to a computer for {{U}}?(64) ?{{/U}}. First, the computer needs to
reposition this picture according to the position of your eyes, and then starts
to read the {{U}}?(65) ?{{/U}} of your physiological features such as the
ratio of your pupil to the whites of your eyes and the shape of your nose. Next,
it seeks matching records from the database. Finally, it makes a
decision. |
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