Graphically demodulating graphical bar codes without foreknowledge of the original unmodulated base image
AssigneeHewlett-Packard Development Company, L.P.
InventorsDoron Shaked, Avi Levy, Jonathan Yen
Life of this patent
Estimating the term…
Abstract
Systems and methods of graphically demodulating a graphical bar code (i.e., an image that contains inconspicuous graphical modulations that encode information embedded in an original base image) are described. The graphical bar code may be graphically demodulated automatically without foreknowledge of the original unmodulated base image, but rather based upon a base image that is derived based upon intrinsic features of the graphical bar code.
Claims20
A method of decoding a graphical bar code corresponding to an original base image modulated with a graphical encoding of an original message, comprising:
- measuring one or more intrinsic features of the graphical bar code;
- based upon the intrinsic feature measurements, selecting a sequence of graphical templates from a predefined template set of information-encoding graphical templates;
- and
- graphically demodulating the graphical bar code with the selected sequence of graphical templates to produce a message.
A computer program for decoding a graphical bar code corresponding to an original base image modulated with a graphical encoding of an original message, the computer program residing on a computer-readable medium and comprising computer-readable instructions for causing a computer to:
- measure one or more intrinsic features of the graphical bar code;
- based upon the intrinsic feature measurements, select a sequence of graphical templates from a predefined template set of information-encoding graphical templates;
- and
- graphically demodulate the graphical bar code with the selected sequence of graphical templates to produce a message.
Dependencies are inferred from the claim text.