Reading and verification are different jobs
OCR tries to read unknown characters. OCV checks whether expected characters are printed correctly. Barcode and QR systems identify products. Many production lines need all three: read the code, verify the print, and store proof that the right product passed.
The hard parts are physical
Most failures come from glare, motion blur, low contrast, bad angle, weak lighting, label variation, dirty surfaces, and timing. A useful solution handles retries, logs failed images, and makes it easy to see why a read failed.
What the system can output
Outputs can be simple relay OK/NOK signals, CSV logs, database writes, API calls, dashboard events, SAP/MES-style handoff, or an operator queue for cases that need human confirmation.