This book is a complete treatise on Quick Response (QR) Code symbols—the square barcodes that can be read by smart phones. Widely used in marketing, they also reveal a creative solution to interesting challenges in computer graphics. The book describes the theory behind QR Code symbols and details the processes of encoding and decoding information in a QR Code symbol. The book explains sophisticated error correction techniques that allow a symbol to be scanned even if it is partially obscured, and it delves into the theoretical foundation of error correcting codes using basic mathematics. Java source code for constructing, scanning, and decoding QR symbols will be available for download.

目录

Introduction
Introducing the QR Code
A Brief History
Why the QR Code?
Ways to Misuse QR Symbols

Basics
Anatomy of a QR Symbol
Scanning the Image
Decoding the Matrix
Encoding a Symbol
Printing Consideration

Error Correction
Introduction to Error Detection and Correction
Finite Fields
Reed-Solomon Codes
Bose-Chaudhuri-Hocquenghem (BCH) Codes

Encoding
Data Analysis
Encoding to a Bit Stream
Construction of Error Correction Blocks
Placement into the Symbol Matrix
Masking
Completion of the Symbol Matrix

Scanning and Decoding
Scanning: Recognizing the Module Matrix
Decoding the Module Matrix

Mathematical Background

Encoding Tables

Source Code Documentation

Glossary

Bibliography

Index

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