Resolution gain on width modulated bar codes by use of angled sampling in two dimensions
First Claim
1. A bar code imaging system comprising:
- an imaging element adapted to receive light reflected from a bar code symbol and provide a two-dimensional image of said bar code symbol;
means for decoding said two-dimensional image into data representative of said bar code symbol, said decoding means comprising means for measuring spacing between elements of said bar code symbol by sampling along a diagonal line segment that intersects said elements; and
means for selecting an angle of said diagonal line with respect to said elements of said bar code symbol.
2 Assignments
0 Petitions
Accused Products
Abstract
A bar code imaging system provides increased resolution for accurately interpreting width modulated bar code symbols. The bar code imaging system comprises an imaging element adapted to receive light reflected from a bar code symbol and provide a two-dimensional image of the bar code symbol. The two-dimensional image is decoded into data representative of the bar code symbol. More particularly, the spacing between adjacent bar elements and adjacent space elements of said bar code symbol is measured by sampling along a diagonal line segment that intersects the adjacent bar elements. The diagonal sampling allows a greater number of pixels to be included in the measurement. If necessary, a perpendicular spacing measurement can be derived from the diagonal measurement.
10 Citations
21 Claims
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1. A bar code imaging system comprising:
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an imaging element adapted to receive light reflected from a bar code symbol and provide a two-dimensional image of said bar code symbol; means for decoding said two-dimensional image into data representative of said bar code symbol, said decoding means comprising means for measuring spacing between elements of said bar code symbol by sampling along a diagonal line segment that intersects said elements; and means for selecting an angle of said diagonal line with respect to said elements of said bar code symbol. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A bar code imaging system comprising:
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an imaging element adapted to receive light reflected from a bar code symbol and provide data representing a two-dimensional image of said bar code symbol; an image memory coupled to said imaging element to store said two-dimensional image data; means for processing said stored two-dimensional image data, said processing means comprising means for measuring spacing between elements of said bar code symbol by sampling along a diagonal line segment that intersects said elements; and means for selecting an angle of said diagonal line with respect to said elements of said bar code symbol. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method for measuring spacing between elements of a bar code symbol comprising the steps of:
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receiving a light pattern reflected from a bar code symbol and providing two-dimensional data corresponding to said light pattern; storing said two-dimensional image data; processing said stored two-dimensional image data by sampling along a diagonal line segment that intersects said elements; and selecting an angle of said diagonal line with respect to said elements of said bar code symbol. - View Dependent Claims (15, 16, 17, 18)
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19. A bar code imaging system comprising:
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an imaging element adapted to receive light reflected from a bar code symbol and provide data representing a two-dimensional image of said bar code symbol; an image memory coupled to said imaging element to store said two-dimensional image data; and a processor coupled to said imaging element and said image memory, said processor being adapted to measure spacing between elements of said bar code symbol by sampling along a diagonal line segment that intersects said elements, and select an angle of said diagonal line with respect to said elements of said bar code symbol. - View Dependent Claims (20, 21)
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Specification