2D Bar Codes
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Transcript of 2D Bar Codes
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CAO Lei (ee_clxab)NING Bo (ee_nbxaa)
SURIA Omair Aziz (ee_soa)
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Definition: Matrix (2D) barcodes A matrix code, also known as a 2D barcode or simply a 2D code, is a two-dimensional way of representing information. It is similar to a linear (1-dimensional) barcode, but has more data representation capability. (From Wikipedia)
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The quest for higher capacity barcodes printed to the same scale
Code 128Char encoded:ABC1234xyz Char Count:10
PDF417Char encoded:ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz Char Count: 62
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Barcode type
Information
density
Information
capacity
Information type
Error correctio
n function
Dependence on database
Nature
1D Low Small Numbers, English Yes
Must depend on database or communication
network
Object label & index
2D High Big
Numbers, English, Chinese, pictures, voice and other
binary information
No
No depend on database or
communication network
Description on
objects
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High Capacity◦ Up to 7,089 characters
Small Printout size◦ 1/10 size 1D Barcode
Damage Resistant◦ Up to 30% of codewords
Omni-directional◦ 360 degree high speed
reading◦ Makes use of position
detection patterns located at 3 corners.
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Four levels of error correction capability Raising this level improves
error correction capability but also increases the code size.
Factors: Operating Environment and QR code size (e.g. Factory compared to clean environment)
• Error Correction feature implemented by adding a Reed-Solomon Code to the Original data
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MaxiCodeAztec Code ShotCode
QR Code EZ Code HCCB
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Dolby Digital
Mobile ticketing
URL storage
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The End