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Barcode Verification

ISO/IEC 15415

2d cades, datamatrix, maxi code, and qr code

The standard for 2-D label-based barcodes

For 2-D barcodes, barcode verifiers analyze the structure of the symbol and the reflectance of each of the modules. 2-D label-based codes are graded according to eight different parameters under the ISO 15415 standard. Like with 1-D barcodes, some parameters are image-related, and others are data-related. Because 2-D barcodes contain so much more data than 1-D barcodes, there are more parameters related to data quality than image quality.

Grading

The lowest individual parameter grade becomes the overall grade for the code. The grading process begins with a pass/fail test. If the code can be decoded, it passes the first test. If it cannot, it is automatically assigned an “F” grade. After a code is decoded, it is graded for symbol contrast, modulation, reflectance margin, fixed pattern damage, axial non‐uniformity, grid non‐uniformity, and unused error correction.

ISO/IEC 15415 Quality Perameters

Symbol Contrast refers to the difference between the darkest and the lightest modules.
Not enough contrast
Modulation measures local variations in contrast.
Poor modulation
Fixed Pattern Damage includes errors with the L sides or clock pattern or quiet zone.
Fixed pattern damage
Axial Non-uniformity refers to the uneven scaling of the code.
Non uniformity
Grid Non-uniformity measures the biggest deviation from the grid.
Grid non uniformity
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