Method and apparatus for determining the width of elements of bar code symbols
First Claim
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1. A method for decoding a bar code symbol, comprising the steps of:
- (a) receiving a signal representative of said symbol;
(b) searching said signal in one dimension to locate two points corresponding to an element of said symbol;
(c) computing a value representative of the signal energy between said two points;
(d) determining the width of said element in accordance with said value ; and
(e) determining at least one deviation associated with said element.
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Abstract
A system for decoding a bar code symbol receives a signal representative of the symbol and searches the signal in one dimension to locate two adjacent critical points corresponding to an element of the symbol. The system also computes a value representative of the signal energy between the two critical points and determines the width of the element in accordance with the value.
65 Citations
24 Claims
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1. A method for decoding a bar code symbol, comprising the steps of:
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(a) receiving a signal representative of said symbol; (b) searching said signal in one dimension to locate two points corresponding to an element of said symbol; (c) computing a value representative of the signal energy between said two points; (d) determining the width of said element in accordance with said value ; and (e) determining at least one deviation associated with said element. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for decoding a bar code symbol, comprising:
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(a) means for receiving a signal representative of said symbol; (b) means for searching said signal in one dimension to locate two points corresponding to an element of said symbol; (c) computing means for computing a value representative of the signal energy between said two points; (d) means for determining the width of said element in accordance with said value ; and (e) means for determining at least one deviation associated with said element. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for determining the width of an element of a bar code symbol, comprising the steps of:
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(a) receiving a signal representative of the symbol; (b) searching said signal in one dimension to locate a first point within the immediately preceding element; (c) searching said signal in said one dimension to locate a second point within the immediately following element; (d) computing a value representative of the signal energy between said first and second points; and (e) determining the width of the element in accordance with said value. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. An apparatus for determining the width of an element of a bar code symbol, comprising:
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(a) means for receiving a signal representative of the symbol; (b) means for searching said signal in one dimension to locate a first point within the immediately preceding element and for searching said signal in said one dimension to locate a second point within the immediately following element; (c) means for computing a value representative of the signal energy between said first and second points; and (d) means for determining the width of the element in accordance with said value. - View Dependent Claims (21, 22, 23, 24)
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Specification