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AssigneeHewlett-Packard Development Company, L.P.
InventorsNiranjan Damera-Venkata, Jonathan Yan
Estimating the term…
Systems and methods for generating graphical bar codes (i.e., images that contain inconspicuous graphical modulations that encode embedded information) by halftoning with embedded graphical encoding are described. In one aspect, a graphical bar code is generated by halftoning regions of an original image. The original image regions incorporate errors diffused among regions of the original image and computed based at least in part upon modulations in the graphical bar code corresponding to a graphical encoding of a message. In another aspect, a graphical bar code is decoded by generating a base image having halftone regions representative of an original image. Regions of the base image are compared probabilistically to a set of graphical code words to obtain a sequence of graphical code words corresponding to a graphical encoding of a message. The sequence of graphical code words is decoded to produce a decoded message.
A method of generating a graphical bar code, comprising halftoning regions of an original image incorporating errors diffused among regions of the original image and computed based at least in part upon modulations in the graphical bar code corresponding to a graphical encoding of a message.
A computer program for generating a graphical bar code, the computer program residing on a computer-readable medium and comprising computer-readable instructions for causing a computer to:
A method of decoding a graphical bar code, comprising:
A computer program for decoding a graphical bar code, the computer program residing on a computer-readable medium and comprising computer-readable instructions for causing a computer to:
Dependencies are inferred from the claim text.