Camera Height Estimate
Estimate height with a phone camera when a ruler or stadiometer is unavailable. Photograph the child beside an object of known height; the tool calculates the ratio.
Upload a photo
Photograph the child beside an object with a known height, such as a door frame or a one-metre ruler.
Tips
- Keep the camera level, face the child directly, and keep child and reference at the same distance.
- Child and reference must be in the same plane. A front/back offset creates perspective error.
- Useful references: a standard door (≈205 cm), one-metre ruler, A4 long edge (29.7 cm), or a known adult height.
- ±3 cm error is possible. Use a stadiometer for clinical decisions.
Phase 2 roadmap
Automatic landmark detection, pose estimation and AR distance sensing are planned. The target error is under 1 cm; Scientific Board review is ongoing.
Frequently asked questions
Is camera height measurement as accurate as clinical measurement?
No. It gives an approximate result. Use a stadiometer or careful wall measurement for clinical decisions.
Why is a reference object required?
A known-height object converts image pixels into centimeters. If the reference is wrong, the result is wrong.
How can perspective error be reduced?
Keep the child and reference in the same plane, photograph from straight ahead and avoid tilting the phone.
How much can the result differ?
Home measurements can vary by several centimeters. Repeated careful measurements are more useful than one photo.
When should camera measurement not be used?
Use clinical measurement instead when medical decisions, treatment monitoring or growth disorder concerns are involved.