2d bar codes

CAO Lei (ee_clxab)NING Bo (ee_nbxaa)

SURIA Omair Aziz (ee_soa)

                       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)

      The quest for higher capacity barcodes printed to the same scale

Code 128Char encoded:ABC1234xyz Char Count:10

PDF417Char encoded:ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz  Char Count: 62

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

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.

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

MaxiCodeAztec Code ShotCode

QR Code EZ Code HCCB

Dolby Digital

Mobile ticketing

URL storage

The End