Quality Requirements

Factor	Requirement
Resolution	≥ 480p
Frame rate	≥ 15 fps (engine default `fps=30`)
Face angle	Within ±30° of camera
Lighting	Avoid harsh backlight
ROI	Forehead (default), cheeks, or full face
rPPG SNR	> 3.0 required
Min duration (HR)	30 s
Min duration (HRV)	60 s
Min duration (BP)	60 s	If the requirements aren’t met, the engine returns the metric with `confidence: 0.0`. The downstream analyzer falls back to a Medera reasoning transcript-inferred analysis with `requires_human_review: true`.