| 摘要 |
Verification patterns (19) are associated with barcodes (1) to provide rapid, visual confirmation that a barcode is printed within acceptable tolerances. A master of a barcode to be produced includes at least one verification pattern (19) including a wedge (21) formed by an unprinted area or areas bounded by a printed area or areas. During reproduction, an anticipated degree of ink-spread will cause a predetermined degree of shortening of the wedge, while abnormal degrees of shortening are an indication of press and/or pre-press errors and/or an inappropriately specified master. With a suitably dimensioned wedge, compliance with bar and space width tolerances can be assessed. Two types of verification patterns (19, 19A) may be used in conjunction with a single bar code to enable detection of different types of errors.
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