Method and apparatus for determining the width of elements of bar code symbols
AssigneeUnited Parcel Service of America, Inc.
InventorsMihael Klancnik, Luis Figarella
Life of this patent
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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.
Claims24
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.
An apparatus for decoding a bar code symbol, comprising:
- (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.
A method for determining the width of an element of a bar code symbol, comprising the steps of:
- (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.
An apparatus for determining the width of an element of a bar code symbol, comprising:
- (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.
Dependencies are inferred from the claim text.