The passport photographs of the future could turn out to be more than just another pretty picture if a new computer technique developed by Israeli scientists catches on.

Researchers at Ben-Gurion University, in Israel, have invented a way to hide information such as a fingerprint or signature in color images. They believe this could improve passport safety or be used to produce product bar codes(條形碼) or designs that cannot be seen.

“The papers can be faxed, scanned(掃描) and reprinted without hidden data disappearing,” New Scientist magazine said last week.

Joseph Rosen and a team of scientists worked out the new instrument by creating a mathematical model.

The model turns a fingerprint or signature into a series of numbers which are used to shape the dots that make up a color picture.

“Each dot can be forced out of the usual place slightly without noticeably changing the final appearance of the image,” the magazine said.

Several images that can be hidden in a single picture are scanned into a computer which does the work.

The hidden images or fingerprints cannot be shown until the picture is scanned again.

The computer rebuilds the fingerprint by measuring the displacement of the dots in the picture.

The magazine said that if he model is used for passport checkpoints the picture can be unscrambled(解碼) to show the fingerprint or signature and checked against the person holding the passport.

The researchers are now working on a handheld, and instrument which could make unscrambling the hidden information easier.

 

36. The new passport photos will probably contain all EXCEPT _____.

   A. one’s picture             B. one’s fingerprint

   C. one’s signature          D. one’s blood type

37. The writer probably got the information about the new passport photos from ___.

   A. Israeli scientists      B. a radio or TV     C. a newspaper    D. a magazine

38. What is the best title for the passage?

   A. A New Computer Technique by Israeli Scientists

   B. A New Way t Hide Information

   C. The New Passport Photo: More Than Meets the Eye

   D. Safe Passport Photos

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To get traveler's checks you usually go to your bank. They can be paid in cash or in other ways. Large amounts, however, must be ordered in advance.

For the safety and convenience of traveler's checks, you are charged two commissions(傭金，酬勞): an insurance commission when you buy them and an encashment commission when you cash them.

It is suitable to make a note of the serial numbers of your checks. Keep this separate from your traveler's checks.（詞數(shù)191）

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A．they cannot be lost or stolen

B．they can be used anywhere

C．they are safe and handy

D．they can save travelers plenty of money

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A．The authority that issues you the passport.

B．The insurance company.

C．The bank where you buy your checks.

D．The travel agency that arranges your travel.

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A．get your passport

B．cash it

C．claim insurance

D．pay for commission

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B．People usually get traveler’s checks from foreign banks.

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