Application guide
What can an inline code-inspection system do?
A fixed industrial reader or machine-vision camera can check every correctly presented pack for a 1D barcode, QR code, Data Matrix or other agreed symbol. The decoded content can be compared with the active job, checked against permitted rules and associated with a pass, reject, alarm or line-stop decision.
The system can also correlate a code with visible artwork, printed text or a second code elsewhere on the pack. This helps control mixed labels, wrong variants and packaging-component errors rather than merely confirming that some code can be read.
Reading, validation and verification must be specified separately
A successful read confirms that the installed reader decoded the symbol under the production conditions at that moment. It does not automatically provide an ISO print-quality grade. Content validation checks whether the decoded data follows an expected format or business rule. Formal barcode verification requires suitable equipment, calibration and a defined standard.
Oxford Vision Systems will define which of these outcomes the project must deliver. This prevents a basic presence or read check from being mistaken for a calibrated verifier and makes the acceptance test measurable.
Code and packaging checks that can be combined
- Presence and readability of EAN, UPC, Code 128 and other agreed 1D symbols
- QR, Data Matrix and GS1 DataMatrix decoding
- Comparison with a master code, job recipe or approved list
- GTIN, batch, expiry, serial or application-identifier content rules
- Multiple-code detection and control of the intended code position
- Dual-marked pack checks during 1D-to-2D transition projects
- Correlation with label artwork, OCR/OCV or upstream product identity
- No-read, wrong-code and duplicate-code handling where supported by the data design
Prepare packaging lines for the move towards 2D
GS1's retail programme has an ambition for point-of-sale systems to be capable of processing suitable 2D codes by the end of 2027, while existing linear symbols are expected to coexist during transition. A packaging-line project therefore needs to define the symbol, syntax, encoded data, dual-marking rules and how the printed result will be checked. See the GS1 UK 2D barcode guidance.
Camera selection should allow for the physical code size, module size, line speed, print process and worst-case pack movement. Multiple codes in one field of view may require logic to confirm which symbol is authoritative for the active job.
Optics, presentation and print quality
Glossy labels, shrink sleeves, curved containers, embossed surfaces and metallic films can create reflections or geometric distortion. Controlled diffuse lighting, polarisation, suitable lens geometry and stable product handling are used to produce a repeatable image. Trials should include low-contrast and borderline codes, not only ideal samples.
Data, controls and failed-pack containment
The inspection can exchange the expected code with a PLC, printer, line controller or database where the interface is available. User permissions, recipe authority, network resilience and the behaviour following loss of data must all be agreed.
Failed or uncertain results can be counted, logged and tracked to automatic rejection. Secure reject collection and confirmation sensors help demonstrate that a wrong-code or no-read pack did not continue downstream.
Build a complete identity check
Link code inspection with date and lot-code verification, label identity, case and pallet codes and a measurable system specification.