Guiding a scanning device to decode 2D symbols
First Claim
Patent Images
1. A method for guiding a scanning device to decode a 2D symbol, the method comprising:
- providing a set of substantially parallel positioning lines to the 2D symbol, the positioning lines being neither perpendicular to nor parallel with any border of the 2D symbol; and
scanning the 2D symbol together with the positioning lines to produce a scanned image.
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Abstract
To facilitate the decoding of a 2D symbol (e.g., PDF417), a plurality of positioning lines are attached to the 2D symbol. Depending on implementation, these substantially parallel positioning lines may be provided on at least one side of the symbol or superimposed on the symbol. A scanning device is provided to capture an image of the symbol together with these positioning lines that are then detected to determine an orientation of the 2D symbol. In some cases, these positioning lines are used to correct images with distortion.
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Citations
15 Claims
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1. A method for guiding a scanning device to decode a 2D symbol, the method comprising:
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providing a set of substantially parallel positioning lines to the 2D symbol, the positioning lines being neither perpendicular to nor parallel with any border of the 2D symbol; and
scanning the 2D symbol together with the positioning lines to produce a scanned image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A scanning device for decoding a 2D symbol attached with a set of equally spaced positioning lines, the scanning device comprising:
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a signal processing chip;
a document detection module connecting to the processing chip for sending a paper signal when the 2D symbol presents and exists;
an image sensor sensing the 2D symbol and producing analog signals;
an analog-to-digital conversion (ADC) module receiving and digitizing the analog signals from the image sensor to produce a digital image thereof in a memory space; and
a flash memory for storing a decoding software, wherein the decoding software is configured to perform operations of;
detecting the positioning lines in the digital image;
determining a slope of the positioning lines with respect to a slope of the 2D symbol, wherein the slope of the positioning lines is different than that of a horizontal axis and a vertical axis of the 2D symbol; and
determining an orientation of the 2D symbol. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification