초록 ▼

Bar code decoding methods and apparatus are disclosed wherein prototype characters aregenerated using calculated bar code distortion attributes. The vector distance measurements between the scanned bar code characters and the prototype characters are advantageously utilized to provide advanced and i

Bar code decoding methods and apparatus are disclosed wherein prototype characters aregenerated using calculated bar code distortion attributes. The vector distance measurements between the scanned bar code characters and the prototype characters are advantageously utilized to provide advanced and improved decoding.

대표청구항 ▼

[ What is claimed is:] [1.] A method for reading a bar code having a set of distortion attributes, said bar code comprising a number of encoded characters selected from a set of standard characters, said method comprising the steps of:i) scanning the bar code with a bar code scanner;ii) detecting an

[ What is claimed is:] [1.] A method for reading a bar code having a set of distortion attributes, said bar code comprising a number of encoded characters selected from a set of standard characters, said method comprising the steps of:i) scanning the bar code with a bar code scanner;ii) detecting an optical signal reflected back from the scanned bar code;iii) generating a digital signal corresponding to the scanned bar code;iv) decoding the digital signal by(a) calculating the set of distortion attributes of said scanned bar code;(b) forming a subset of standard characters from the set of standard characters;(c) modifying the subset of standard characters by the set of distortion attributes to form a group of prototype characters;(d) calculating a group of separation distances for each encoded character; and(e) selecting for each encoded character a match prototype character from the group of prototype characters using the group of separation distances; andv) producing output indicative of a information encoded in the bar code.