Any absolute measurement in millimetreswhat a photo can give, and how we take it.
Everything as ratios of your own features (iris width, inter-pupil distance, face height) — the only scale a single photo supports — and a score out of 100 on each.
What we report
Everything as ratios of your own features (iris width, inter-pupil distance, face height) — the only scale a single photo supports — and a score out of 100 on each.
Why not the clinical number itself
Scale is unrecoverable from a single uncalibrated 2D image. Without a reference object in frame or a metric 3D capture (TrueDepth, stereophotogrammetry), a photo cannot say whether a face is 130 mm or 145 mm wide — only what its proportions are. Every Canthion output is a ratio or an angle for this reason.
Sources
- Zielonka, Bolkart & Thies 2022 (MICA) — the metric-reconstruction problem — zielon.github.io/mica/
Ratios of near-coplanar frontal distances, angles relative to the interpupillary line, and skin appearance — each with an error bar, each against a population you choose. Start an analysis or read the methodology.
How every bone-level measurement is taken here · all insights