All errors that do not meet the minimum quality requirements (quality class 1.5) of GS1 are listed here. If a higher quality than 1.5 was required and not achieved, these errors were not included in the evaluation. Only the ISO parameters with more than 5 % errors were listed.
Total symbol class 22.7 % of the 198 symbols checked in 2018 according to ISO were incorrect.
Decoding (12.6 %): Determination of the information encoded in a barcode symbol. This can only be 4 (= good) or 0 (= bad). Poor decoding: wrong check digit, wrong code content, light zone too small, element or edge determination errors.
Decodability (9.1 %): The value indicates how well a barcode - depending on bars and spaces - is readable by a scanner.
Modulation (5.1 %): Uniformity of reflection ratios over the entire code; is the ratio of minimum edge contrast to symbol contrast.
78 % of the codes checked were not GS1 compliant. Only the GS1 parameters with more than 5 % errors were listed.
Height (37.2 %): Height of the bars of a barcode.
X-module (28.6 %): X-module is the width of the narrowest element (bar, gap) of a barcode symbol.
Symbol structure (38.3 %): Basic technical error in a symbol, such as missing FNC1 character, incorrect check character or check digit or brackets encoded with the application identifier.
Data structure (9.2 %): Structure of the data in a barcode; error in the application of the data elements (application identifier).
Plain text line (5.7 %): Characters and letters below or near the symbol. The plain text line is a one-to-one representation of the encoded (user) data.
Bright zone (6.8 %): The zone before the start and after the stop sign of a barcode, which must be free of any interfering markings.