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Full Description
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.
Contents
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 MatrixMathematical Background Encoding Tables Source Code Documentation Glossary Bibliography Index
