An alignment target is a calibrated visual reference whose pattern allows software to identify position, orientation and movement across camera images.
The pattern provides many identifiable feature points.
Multiple views allow the system to solve target pose in space.
Target condition and rigidity affect confidence in the result.
The target itself can remain passive and maintenance-light.
What the camera recognizes
A target is designed with high-contrast shapes whose positions are known. Image-processing software detects these features and matches them to a target model. Because the pattern is asymmetric and information-rich, the software can distinguish orientation and track the same target through wheel roll, steering movement and adjustment.
How target position is reconstructed
A single image shows where a feature appears on a two-dimensional sensor. With calibrated camera geometry, multiple observations provide enough information to estimate the target pose: horizontal position, vertical position, distance and rotation. The system then relates target movement to wheel and vehicle geometry.
What reduces recognition quality
Dirt, severe target damage, glare, partial obstruction and excessive working distance can reduce the number or quality of recognized features. Good systems can tolerate some loss, but technicians should not treat recognition margin as permission to ignore target care. A clean target and clear camera view support faster acquisition and more stable readings.
A target is part of the measuring instrument. Handle and store it with the same care as any other precision reference.
Diagnostic reference
| Finding | Possible meaning | Next check |
|---|---|---|
| Target not detected | Pattern hidden, damaged or outside camera view | Restore visibility and inspect the target surface |
| Target identified on wrong wheel | Targets installed in incorrect positions | Confirm target IDs and wheel locations |
| Reading changes after target is touched | Target or clamp not mechanically secure | Reinstall and repeat compensation if required |
Workshop procedure
- Verify the correct target is assigned to each wheel position.
- Inspect the pattern surface for dirt, peeling or impact damage.
- Install the target fully into its holder.
- Confirm it cannot rotate independently of the clamp.
- Check camera acquisition before starting compensation.
- Store targets where the faces and mounting interfaces are protected.
Frequently asked questions
Do passive targets need batteries?
No. Passive targets are observed by the camera and contain no wheel-mounted electronics.
Can a damaged target still work?
Minor marks may be tolerated, but damage can reduce recognition margin or alter the reference. Follow the manufacturer inspection criteria.
Why are some targets smaller than others?
Camera resolution, lens design, pattern density and working distance determine how small a target can be while remaining reliably recognizable.
Technical reference · Published 17 July 2026 · Review product documentation before service.