We investigate new "multilevel" coding principes for 2D bar codes for multimedia and security applications.
(Left) Square halftone cell of a-by-a dots and (right) Array of halftone cells.
Multilevel 2D bar code. (left) Original digital image (with 2x2 pixels per symbol and 1 pixel of inter-symbol space) where each symbol corresponds to some gray scale value and (right) Printed-and-scanned digital image (printing resolution 600 dpi, scanning resolution 600 ppi, 6x6 pixels per noisy symbol). Each graphical symbol represents the encoded grayscale value.
Related publications
- R. Villán, S. Voloshynovskiy, O. Koval, and T. Pun, "Multilevel 2D Bar Codes: Towards High Capacity Storage Modules for Multimedia Security and Management," IEEE Transactions on Information Forensics and Security, vol. 1, iss. 4, pp. 405-420, 2006. [pdf| ps.gz|bib]
- R. Villán, S. Voloshynovskiy, O. Koval, and T. Pun, "Multilevel 2D Bar Codes: Towards High Capacity Storage Modules for Multimedia Security and Management," in Proc. Proceedings of {SPIE-IS&T} Electronic Imaging 2005, Security, Steganography, and Watermarking of Multimedia Contents VII, San Jose, USA, 2005, pp. 453-464. [pdf| ps.gz| pdf|bib]
