Barcode and how is it made?

Barcode basically encodes alphanumeric characters and symbols using black and white stripes, also called bars. it is a machine-readable code in the form of numbers and a pattern of parallel lines of varying widths, printed on a commodity. Hence a barcode essentially is a way to encode information in a visual pattern that a machine can read. The combination of black and white bars (elements) represents different text characters which follows a set algorithm for that particular barcode. Barcode contains information about a product like; price & weight of the product, date of manufacturing and expiry, name of the manufacturer etc.

 

Structure of Barcode:

Quiet Zone – The minimum required space for barcode scan-ability, preceding the Start Character of a bar code symbol. The quiet zone should be free from any printing and be the same color and reflectance as the background of bar code symbol.

Starts Code – Indicates the start of the barcode. These are special barcode characters & they signify the start of data to the scanner/reader. Start characters are usually stripped-off and not transmitted to the host.

Data –  The actual data the barcode stores.

Check Digit – Check digit (not always present) is a mathematical sum that is used to verify the accuracy of the other elements of the barcode. It is the extra digit added at the end of a bar code to allow the scanner to confirm that it read the barcode correctly. It is typically stripped from the data and not transmitted to the host.

Stop Code – Indicates the stopping point of the barcode. These characters signify the end of data to the scanner/reader. They are also stripped-off and not transmitted to the host.

Trailing Quiet Zone – Another clear space with no printing following the Stop Character.

Post By : Vinod Singh 06 Jul, 2017 tag : Physics

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Vinod Singh