Print presence
Confirm that a date, batch code or other print area contains the expected mark.
Variable-data and print assurance
Label print-quality inspection at production speed
Check that required print is present, readable and consistent enough to meet the defined production standard.
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Inspection tools
Choose the check that matches the risk
Print inspection can range from a simple mark-present check to character verification and machine-readable-code grading. We recommend the simplest reliable tool for each critical feature.
OCR reading
Read variable characters and compare the result with expected production information where available.
OCV verification
Compare printed characters with an expected string or trained reference.
Defect detection
Find missing, broken, smeared or poorly contrasted print against defined acceptance limits.
Barcode and 2D code
Read and optionally grade supported codes when resolution, print quality and presentation permit.
Reliable image formation
Print inspection depends on pixels, contrast and stability
The smallest character or defect must occupy enough pixels to be assessed. Product motion, label reflectivity, print contrast, line vibration and lighting all affect the result.
- Define the smallest critical character or defect
- Test real good and bad print samples
- Control the distance and orientation to the camera
- Agree treatment of marginal but readable print
What is the difference between OCR, OCV and barcode verification?
OCR reads characters when the value may vary. OCV checks printed characters against an expected string or trained reference. A barcode reader decodes the symbol data, while standards-based barcode verification measures defined print-quality parameters using a compliant verifier. An in-line vision system can monitor code quality and data on every pack, but it should only be described as standards-compliant verification when the specified equipment and method support that requirement.
| Inspection method | Best used for | Typical result |
|---|---|---|
| Print presence | Confirming a required date or batch area is marked | Present / absent |
| OCR | Reading variable dates, lots and serial numbers | Recognised character string |
| OCV | Checking print against a known expected value | Match / mismatch |
| Code reading | Decoding a barcode, QR code or Data Matrix | Decoded data and comparison result |
| Barcode verification | Measuring symbol quality against an applicable standard | Formal quality parameters and grade |
GS1 guidance distinguishes barcode readability from formal verification and highlights factors such as quiet zones, contrast, damage and positioning. See the GS1 barcode-quality guidance. For a project-specific route, read our barcode, OCR and OCV inspection guide.
Need code and label verification?
Discuss the applicationCombine identity, artwork and variable print checks
We can review whether the required checks belong in one inspection station or at separate controlled points.
Related project guidance