Saturday, May 16, 2009

Appendix E - First Read Reliability

One of the further advantages of the 2D barcode formats is the first read reliability.

Error Correction

The main 2D barcode symbologies support the Reed-Solomon error correction coding standard.

Raising the level of error correction improves the ability of the reader to decode dirty or damaged symbols but also increases the total amount of data and therefore symbol size.

The specific error correction levels supported by QR Code are shown below. A codeword is a unit that constructs the data area of the symbol and is equal to 8 bits of data.

Processing Time

Some of the potential uses for 2D barcodes are away from the retail domain and are faced with competing technologies including Magnetic Cards, Radio Frequency Identification (RFID) cards, Optical Character Recognition for forms processing and Biological Identification for security access.

The process time of the 2D barcodes is comparable to magnetic cards and RFID cards, details in the table below. A further comparison between 2D barcode and RFIP is provided here.

First Read Rate Success

One of the key metrics for any barcode technology is the success rate for reading the code at the first attempt. First Read Rate (FRR). Barcodes are typically employed as a process automation solution as barcode scanning need to be faster than manual input.

A comparison of FRR statistics of some of the main 2D barcode symbologies is supplied below.

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