Bar-code field detecting apparatus performing differential process and bar-code reading apparatus
First Claim
Patent Images
1. A bar-code field detecting apparatus comprising:
- receiving means for receiving image data including a bar code;
first differential means for differentiating, in a first direction, the image data received by the receiving means so as to output a first differential image;
second differential means for differentiating, in a second direction perpendicular to the first direction, the image data received by the receiving means so as to output a second differential image;
first binary processing means for converting the first differential image to a first binary image by detecting a peak of the first differential image;
second binary processing means for converting the second differential image to a second binary image by detecting a peak of the second differential image;
first expanding means for expanding the first binary image in a direction perpendicular to the first binary image so as to transform the bar-code to a first black pixel rectangular field;
second expanding means for expanding the second binary image in a direction perpendicular to the second binary image so at to transform the bar-code to a second black pixel rectangular field;
first degenerating means for degenerating the first black pixel rectangular field by a predetermined amount so as to output a third black pixel rectangular field;
second degenerating means for degenerating the second black pixel rectangular field by a predetermined amount so as to output a fourth black pixel rectangular field; and
means for detecting a position of the bar code based on the image data degenerated by the first and second degenerating means.
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Abstract
A bar-code field detecting apparatus first differentiates, in X and Y directions, image data of a document including a bar code, the position of which is not determined. It then expands each of the differential images in the direction opposite to the direction in which the image data is differentiated. Expanded images are subjected to bar-code field detection.
39 Citations
8 Claims
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1. A bar-code field detecting apparatus comprising:
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receiving means for receiving image data including a bar code; first differential means for differentiating, in a first direction, the image data received by the receiving means so as to output a first differential image; second differential means for differentiating, in a second direction perpendicular to the first direction, the image data received by the receiving means so as to output a second differential image; first binary processing means for converting the first differential image to a first binary image by detecting a peak of the first differential image; second binary processing means for converting the second differential image to a second binary image by detecting a peak of the second differential image; first expanding means for expanding the first binary image in a direction perpendicular to the first binary image so as to transform the bar-code to a first black pixel rectangular field; second expanding means for expanding the second binary image in a direction perpendicular to the second binary image so at to transform the bar-code to a second black pixel rectangular field; first degenerating means for degenerating the first black pixel rectangular field by a predetermined amount so as to output a third black pixel rectangular field; second degenerating means for degenerating the second black pixel rectangular field by a predetermined amount so as to output a fourth black pixel rectangular field; and means for detecting a position of the bar code based on the image data degenerated by the first and second degenerating means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification