Self-registering spread-spectrum barcode method
First Claim
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1. A method of recording and printing user data on a printed medium, comprising the steps of:
- a. encoding the user data to form an encoded user data array A;
b. modulating user data array A using a two-dimensional pseudo-random kernel Km, to form a modulated data array E;
c. formatting data array E to produce a pixel-based two-dimensional barcode array B; and
d. printing barcode array B onto said portion of the printed medium, wherein the recorded and printed user data is distributed evenly across said portion of the printed medium.
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Abstract
A novel spread spectrum barcode methodology is disclosed that allows a barcode to be read in its entirety even when a significant fraction or majority of the barcode is obscured. The barcode methodology makes use of registration or clocking information that is distributed along with the encoded user data across the barcode image. This registration information allows for the barcode image to be corrected for imaging distortion such as zoom, rotation, tilt, curvature, and perspective.
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Citations
22 Claims
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1. A method of recording and printing user data on a printed medium, comprising the steps of:
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a. encoding the user data to form an encoded user data array A;
b. modulating user data array A using a two-dimensional pseudo-random kernel Km, to form a modulated data array E;
c. formatting data array E to produce a pixel-based two-dimensional barcode array B; and
d. printing barcode array B onto said portion of the printed medium, wherein the recorded and printed user data is distributed evenly across said portion of the printed medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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9. The method of claim 9, wherein two-dimensional pseudo-random kernels Kc and Km are the same.
Specification