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bar code
Bar codes have a meaning because the meaning of a bar code is assigned to that bar code. A bar code identifies an item, and product information regarding that item is held in a data base.
Input - the reader is reading the bar code and putting the information into the computer
A bar code is used to identify a product or item. That's all. Other information associated with that bar code is held on the computer server that is linked to the bar code scanner. That other information could include what the item is, its price, brand, size/weight, and many other particulars. The scanner is able to identify the item, and once the bar code has been used for that, the computer server does the rest.
What a bar code reader is requires an understanding of the amount of information contained in the Bar code itself. Simply the amount of information is huge. All a reader will do is use a LASER beam to collect or read the bar code and transfer the information into a computer.
A bar code scanner scan a little label that has bar code on it.the information is then saved on the computer.It is also use in libraries alot
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price
Nope - the bar-code is simply an identifier mark to define what's being sold.
Yes, it may cause you trouble; especially for the US travels. Contact the authorities responsible for issuing the passport and they will correct it for you
bar code, Universal Product Code (code consisting of a series of vertical bars of variable width that are scanned by a laser; printed on consumer product packages to identify the item for a computer that provides the price and registers inventory information)
Since a bar code represents a number, and an image can be expressed digitally as a series of number, a conventional bar code ( with sufficient length ) can store images, as well as any other type of digital information.