Apparatus, methods, and articles of manufacture consis tent with the present invention
provide a tiled code system for embedded data on a substrate. The tiled code system is
embedded in machine-readable marks and facilitates robust decoding of machine-readable
marks, such as glyphs, when areas on the Substrate are occluded. Additional objects and
advantages of the invention will be set forth in part in the description which follows, and in
part will be clear from the description, or may be learned by practice of the invention. The …