Fiducial mark patterns for graphical bar codes
First Claim
1. A bar coding method, comprising:
- modulating a base image with a graphical encoding of a message to produce a graphical bar code; and
generating a fiducial mark pattern comprising a plurality of dots arranged to track one or more reference locations and local deformation across the graphical bar code.
2 Assignments
0 Petitions
Accused Products
Abstract
Fiducial mark patterns for graphical bar codes (i.e., images that contain inconspicuous graphical modulations that encode embedded information) that are characterized by high detection robustness and good local deformation tracking are described. In one bar coding method, a base image is modulated with a graphical encoding of a message to produce a graphical bar code, and a fiducial mark pattern comprising a plurality of dots arranged to track one or more reference locations and local deformation across the graphical bar code is generated. In another bar coding method, fiducial mark candidates are identified in a fiducial mark pattern, a fiducial mark path is computed based upon one or more of the identified fiducial mark candidates, and one or more reference locations are identified based upon the computed fiducial mark path.
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Citations
21 Claims
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1. A bar coding method, comprising:
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modulating a base image with a graphical encoding of a message to produce a graphical bar code; and
generating a fiducial mark pattern comprising a plurality of dots arranged to track one or more reference locations and local deformation across the graphical bar code. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18, 19, 20)
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12. A computer program residing on a computer-readable medium and comprising computer-readable instructions for causing a computer to:
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modulate a base image with a graphical encoding of a message to produce a graphical bar code; and
generate a fiducial mark pattern comprising a plurality of dots arranged to track one or more reference locations and local deformation across the graphical bar code.
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13. A bar coding method, comprising:
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identifying fiducial mark candidates in a fiducial mark pattern;
computing a fiducial mark path based upon one or more of the identified fiducial mark candidates; and
identifying one or more reference locations based upon the computed fiducial mark path.
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21. A computer program residing on a computer-readable medium and comprising computer-readable instructions for causing a computer to:
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identify fiducial mark candidates in a fiducial mark pattern;
compute a fiducial mark path based upon one or more of the identified fiducial mark candidates; and
identify one or more reference locations based upon the computed boundary path.
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Specification