Do not choose iris or face recognition from a product claim alone when workers wear helmets and masks. Masks change the visible facial area, while helmet brims, protective eyewear, spectacles and fit may affect face or eye acquisition. Iris recognition also requires visible eyes, suitable positioning and user cooperation. Test iris, face and any dual-mode proposal with the mine’s workers, normal protective equipment, actual lighting and shift-change process, then select against verification outcomes, failure causes, queue operation and staffed-review capacity.
Observe protective equipment and work rules first
List the helmets, masks, spectacles, eye protection and lighting used in normal operation, and establish what may or may not be adjusted at the checkpoint. Safety requirements take priority over identity acquisition.
Conditions to validate for iris
- Whether the eyes remain visible with normal protective equipment.
- Whether mounting and guidance accommodate worker height and position.
- Effects of lighting, dust, lens reflection and user cooperation on the workflow.
- Whether retries obstruct the following queue.
Conditions to validate for face
- How much usable facial area remains with masks, helmet brims and eye protection.
- Portal lighting, camera angle, backlighting and queue direction.
- Whether verification can occur without relaxing protective-equipment rules.
- How failures move to another method or staffed review.
When to evaluate dual mode
Where equipment or entrance conditions vary, one terminal may be evaluated for iris and face capability. The project must still define the normal method, fallback and any sequential requirement. Dual mode does not replace site validation or guarantee better operational performance.
Test the complete shift-change workflow
- Include queuing, guidance, identity, card comparison, permission and physical passage.
- Record each failure cause, retry and staffed intervention point.
- Keep person-card comparison and other mandatory checks after identity succeeds.
- Provide an exception exit and staffed-review path outside the main queue.
Confirm before implementation
- Normal protective-equipment rules and items that cannot be adjusted.
- Verification position, mounting, lighting, network and power.
- Decision and exception rules for iris, face and dual mode.
- Biometric governance and manual-review authority.
Frequently asked questions
Is iris always easier than face recognition when a mask is worn?
No. Eye visibility, position, lighting and cooperation still affect iris acquisition. Test with actual protective equipment.
Does dual mode require iris and face to succeed every time?
Not necessarily. Sequential, either-method and fallback rules must be explicitly approved for the project.
Can an attendant simply open the gate after a recognition failure?
Staffed review should verify identity, card, permission and other required conditions, then retain the operator, reason and outcome.