Method and apparatus for reading a bar code
First Claim
Patent Images
1. Method for bar code reading comprising the steps of:
- recording a two-dimensional digital image, said image including said bar code;
obtaining edge points from said image;
selecting a reference point;
projecting said edge points on a line including said reference point;
obtaining a direction of a cluster of projected edge points;
obtaining an intensity profile along a curve defined by said direction; and
decoding said bar code from said intensity profile.
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Abstract
A method for reading a bar code digitally records a two-dimensional low resolution image by a camera. A modified Hough Transform obtains vote counts on lines relative to a reference point. The votes are clustered to obtain the bin axis of the bar code. The decoding step of the bar code uses an intensity profile along the bin direction. An apparatus for accomplishing the above method is also set out.
87 Citations
20 Claims
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1. Method for bar code reading comprising the steps of:
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recording a two-dimensional digital image, said image including said bar code;
obtaining edge points from said image;
selecting a reference point;
projecting said edge points on a line including said reference point;
obtaining a direction of a cluster of projected edge points;
obtaining an intensity profile along a curve defined by said direction; and
decoding said bar code from said intensity profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 18, 19, 20)
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15. An apparatus for reading a bar code comprising:
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an image acquisition device to record a two-dimensional digital image including said bar code;
an image processor for;
obtaining edge points from said image;
selecting a reference point;
projecting said edge points on a line including said reference point;
obtaining a direction of a cluster of projected edge points;
obtaining an intensity profile along a curve defined by said direction and decoding said bar code from said intensity profile. - View Dependent Claims (17)
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Specification