From the field
Reading DPM on tough metal parts at line speed
Low-contrast Data Matrix on machined metal looked fine on a desk. On the line, oil film and occlusion told another story.
Context
An industrial manufacturer needed reliable Data Matrix / DPM reads on machined metal for genealogy. An integrator owned the cell I/O. Traceability was not optional — a silent miss was worse than a stop.
What broke the desktop demo
Oil film, cutting marks, curved surfaces and occasional partial occlusion. Marks that decode under soft light fail when specular reflections wipe contrast. Multi-row transfer without position correction adds another failure mode.
Constraints
Fixed takt, limited space for a tunnel, fail-closed behaviour required, maintainable recipes preferred over heroic tuning every shift.
Stack choice
Treat mark quality and lighting as first-class deliverables. Prefer a dedicated industrial code reader or a smart camera tuned for DPM with controlled illumination angles. Hikrobot documents strong DPM performance on readers that combine AI acceleration with dual-colour (red/white) light polling for difficult surfaces — see the code / DPM product line and broader machine vision portfolio. Escalate to PC-based fusion only if multi-side reads or heavy OCR join the same station. Application page: Traceability & OCR.
Lessons
Mark process and lighting beat decoder brand debates. Validate with worst-case parts from the line, not lab coupons. Define what happens on no-read before you argue about decode score.
Related reading
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