Camera Vital Check separates camera-measured outputs from calculated reference values, and explicitly locks metrics it does not support. This page defines exactly what is measured, how, and why certain metrics are not included.
Three outputs only. Measured by the camera. Returned only when quality passes.
bpm
Method
rPPG from green channel
Valid range
40–150 bpm
Confidence
High
Primary output. Reported only on valid scans.
/min
Method
ROI motion frequency
Valid range
8–30 /min
Confidence
Moderate
Derived from slow chest/face movement. More variable than HR.
Method
8-signal composite score
Valid range
good / moderate / poor / invalid
Confidence
High
Not a vital sign. A measurement quality indicator.
These are derived from user-provided data — age, height, weight, sex — not from the camera. They are presented as reference values, not measurements.
Blood Pressure
No clinically validated camera-based BP method exists. PPG-derived BP requires calibration cuffs and individual baseline data.
Oxygen Saturation (SpO₂)
Requires near-infrared and red-channel ratio. Standard RGB cameras cannot measure SpO₂ reliably.
Blood Glucose
No valid mechanism for camera-based glucose measurement. Claims in this space are unsupported.
Arrhythmia Detection
Requires multi-lead ECG-grade signal. rPPG cannot capture rhythm with sufficient resolution for arrhythmia classification.
HRV (Heart Rate Variability)
Standard camera frame rates (25–60 FPS) are insufficient for the sub-second resolution required for clinical HRV analysis.
Stress Scoring
Stress is not a measurable physiological output of rPPG. Composite 'stress' scores from HR data alone are not validated.
Literature review of rPPG accuracy, limitations, and validation standards.
Studies examining whether camera-based HR measurement performs equitably across different skin tones.
Proposed standardisation of validation methodology for camera-based vital signs.
Controlled experiments on the effect of ambient light colour, brightness, and direction on rPPG signal quality.