• Call Cognex Sales: 855-4-COGNEX (855-426-4639)

  • Contact Us
Intro to Barcode Verification Banner

Barcode Verification

ISO/IEC 15416

A Closer Look at 1D Barcodes

The standard for 1-D label-based codes

The verification standard for 1-D codes, ISO 15416, requires 10 individual scan lines be taken throughout the height of a code and a grade assigned to each scan line. Scan line grades are determined by testing seven different parameters; the lowest graded parameter becomes the overall grade for the individual scan line. The formal grade is formulated by taking the average of all of the individual line scan grades.

The first three parameters—minimum reflectance, decode, and minimum edge contrast-- are graded as pass or fail. If a scan line fails minimum reflectance, decode or minimum edge contrast, the line will automatically receive an “F” grade. If all three pass, the software moves on to grade symbol contrast, modulation, defects, and decodability parameters. Each are graded on a scale of A to F. Once every scan line has been graded, the ten scans are averaged to generate a formal grade for the barcode.

ISO/IEC 15416 Quality Parameters

Minimum Reflectance checks whether the bars are dark enough to meet the required ratio of light that is reflected off of the spaces.
Too light
Bars too light
Edge Contrast measures the difference between adjacent bars and spaces.
Too dark
Background too dark
Modulation refers to local variations in contrast.
Local contrast
Localized contrast
Decode checks to see whether the code can be read using the standard reference decode algorithm.
Not read
Symbol read? Y/N
Defects include printing errors, dirt, or markings that affect one single bar or space.
Irregularities
Irregularities
Decodability grades the accuracy of bar and space widths compared to their ideal size. A barcode with bar width growth or distortion will score a low decodability grade.
Bar width distortion
Bar Width Growth/Loss or Distortion
Related Content

For more information on Cognex Products:

Featured Cognex Products

GET ACCESS TO SUPPORT & TRAINING FOR PRODUCTS & MORE

Join MyCognex

HAVE ANY QUESTIONS?

Cognex representatives are available worldwide to support your vision and industrial barcode reading needs.

Contact Us