Document forensics based on steganographic anti-counterfeiting markings and mobile architectures
Proceedings of the 1st international conference on Forensic applications and techniques in telecommunications, information, and multimedia and workshop
Effect of copying and restoration on color barcode payload density
Proceedings of the 9th ACM symposium on Document engineering
Spatial multiplexing and diversity techniques for multiple-element optical wireless links
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Orientation modulation for data hiding in clustered-dot halftone prints
IEEE Transactions on Image Processing
Document imaging security and forensics ecosystem considerations
Proceedings of the 10th ACM symposium on Document engineering
Two-dimensional bar code out-of-focus deblurring via the Increment Constrained Least Squares filter
Pattern Recognition Letters
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In this paper, we deal with the design of high-rate multilevel 2-D bar codes for the print-and-scan channel. First, we introduce a framework for evaluating the performance limits of these codes by studying an intersymbol-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. Second, we present a new model for the print-and-scan channel specifically adapted to the problem of communications via multilevel 2-D bar codes. This model, inspired by our experimental work, assumes perfect synchronization and absence of ISI, but independence between the channel input and the noise is not assumed. We adapt the theory of multilevel coding with multistage decoding (MLC/MSD) to the print-and-scan channel. Finally, we present experimental results confirming the utility of our channel model, and showing that multilevel 2-D bar codes using MLC/MSD can reliably achieve the high-capacity storage requirements of many multimedia security and management applications