Vital signs from a webcam, computed entirely on your device
rPPG Diagnostic Console extracts a pulse signal from tiny colour changes in the skin of your face — the same principle as a fingertip pulse oximeter, without contact. The camera feed never leaves your browser: there is no server, no upload and no account.
You will be asked for camera permission and shown a notice before anything is captured.
What it measures — and how far to trust it
Each metric is listed with its actual method and its actual limitation. Where something does not work yet, it says so.
Heart rate
Plane-Orthogonal-to-Skin projection over forehead and cheek regions, band-passed 0.7–3.5 Hz, peak-picked from a 1024-point FFT.
Validated against synthetic signals at 48, 72, 101 and 150 BPM.
Heart-rate variability
SDNN over detected beat intervals, with ectopic rejection.
Sensitive to beat-timing jitter; treat as indicative.
Drowsiness
Eye aspect ratio, PERCLOS over a 30-second window and a micro-sleep alarm.
Derived from face-mesh landmarks, not from the pulse signal.
Stress
Autonomic load estimated from HRV, fused with facial-tension blendshapes.
A heuristic over population constants, not a clinical measure.
Liveness
Signal-to-noise check in the cardiac band.
Not validated against presentation attacks. It cannot reject a screen replay.
Respiration
0.13–0.5 Hz band from a decimated 30-second window.
Correct on synthetic input; unreliable on live subjects. Under investigation.
What you need
- · A webcam and a browser that supports it. No install.
- · Even, reasonably bright lighting on your face.
- · To sit still for about ten seconds while the buffer fills.