Multilevel 2D Bar Codes: Towards High Capacity Storage Modules for Multimedia Security and Management

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Executive Summary

In this paper, the authors deal with the design of high-rate multilevel Two-Dimensional (2D) bar codes for the print-and-scan channel. They introduce a framework for evaluating the performance limits of these codes by studying an Inter-Symbol Interference (ISI) free, synchronous, and noiseless print-and-scan channel, where the input and output alphabets are finite and the printer device uses halftoning to simulate multiple gray levels. They present a new model for the print-and-scan channel specifically adapted to the problem of communications via multilevel 2D bar codes.

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