Bar code reading method
First Claim
1. A method of recovering a waveform representing a linear bar code, the method including the steps of:
- moving a sensing device relative to the barcode, said sensing device having a two-dimensional image sensor;
capturing, using the image sensor, a plurality of two-dimensional partial images of said bar code during said movement;
determining, from at least one of the images, a direction substantially perpendicular to the bars of the bar code using a Hough transform for identifying an orientation of edges in the at least one image;
determining, substantially along the direction, a waveform fragment corresponding to each captured image;
determining an alignment between each pair of successive waveform fragments; and
recovering, from the aligned waveform fragments, the waveform.
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Accused Products
Abstract
A method of recovering a waveform representing a linear bar code, the method including the steps of: moving a sensing device relative to the barcode, said sensing device having a two-dimensional image sensor; capturing, using the image sensor, a plurality of two-dimensional partial images of said bar code during said movement; determining, from at least one of the images, a direction substantially perpendicular to the bars of the bar code; determining, substantially along the direction, a waveform fragment corresponding to each captured image; determining an alignment between each pair of successive waveform fragments; and recovering, from the aligned waveform fragments, the waveform.
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Citations
19 Claims
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1. A method of recovering a waveform representing a linear bar code, the method including the steps of:
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moving a sensing device relative to the barcode, said sensing device having a two-dimensional image sensor; capturing, using the image sensor, a plurality of two-dimensional partial images of said bar code during said movement; determining, from at least one of the images, a direction substantially perpendicular to the bars of the bar code using a Hough transform for identifying an orientation of edges in the at least one image; determining, substantially along the direction, a waveform fragment corresponding to each captured image; determining an alignment between each pair of successive waveform fragments; and recovering, from the aligned waveform fragments, the waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A sensing device for recovering a waveform representing a linear bar code, said sensing device comprising:
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a two-dimensional image sensor for capturing a plurality of partial two-dimensional images of said bar code during movement of said sensing device relative to said bar code; and a processor configured for; determining, from at least one of the images, a direction substantially perpendicular to the bars of the bar code using a Hough transform for identifying an orientation of edges in the at least one image; determining, substantially along the direction, a waveform fragment corresponding to each captured image; determining an alignment between each pair of successive waveform fragments; and recovering, from the aligned waveform fragments, the waveform. - View Dependent Claims (19)
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Specification