3-Dimensional dot code for paper storage

Details 3-Dimensional dot code for paper storage 3-Dimensional dot code for paper storage

2004-09-01

2008-12-02

Poon, King (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S464000, C358S505000, C358S474000, C382S165000, C382S164000, C382S100000, C235S494000, C235S469000, C235S462010

Reexamination Certificate

active

07460278

ABSTRACT:
A 3-D dot code is embedded in a printed medium using an embedder that embeds data directly into the halftone dots of a selected file that is ready for printing. An extractor extracts the embedded bits by scanning the printed medium and then interprets the embedded data. A bleed-through elimination module in the extractor is able to eliminate adverse affects on the scanned input of the embedded data caused by bleed-through from the print on the opposite side of the page. The extractor may also include a module that compensates for a misaligned scanned input by automatically detecting the rotation and translation, and then registering the image so that the upper-left corner is located in a certain position. This operation expedites subsequent data retrieval, in which data is read by block matching.

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