Camera Vital Check evaluates eight independent signals before returning any result. Quality determines whether a result is shown at all — not just how it is labeled.
All eight signals pass comfortably. The rPPG signal has high SNR and confidence. Results are displayed with the quality grade.
Display Behavior
HR, RR, and quality grade shown. Clinician summary generated if enabled.
Criteria
Signal Health
When a scan is rejected, the user receives a specific reason code and corrective instruction. Vague failures are not acceptable.
FACE_NOT_DETECTED
Face not detected
Position your face fully in the frame
FACE_TOO_SMALL
Face too small / too far
Move closer to the camera
LIGHTING_TOO_DARK
Insufficient lighting
Move to a brighter area or turn on a light
LIGHTING_TOO_BRIGHT
Overexposed
Avoid direct light sources behind you
TOO_MUCH_MOTION
Too much movement
Stay still during the scan
LOW_FPS
Frame rate too low
Close other applications using the camera
LOW_SNR
Signal noise too high
Improve lighting and reduce motion
LOW_CONFIDENCE
Low output confidence
Retry with better conditions
SCAN_TOO_SHORT
Scan duration insufficient
Allow the full 30-second scan to complete
Most rPPG tools display a number regardless of signal quality. Camera Vital Check refuses to.
The rejection behavior is not a weakness. It is a sign that the system understands its own limitations — which is a prerequisite for any measurement platform used in health contexts.
Clinicians and procurement teams respond more positively to a product that says 'conditions were not good enough — retry' than to one that shows a confident number that is actually unreliable.
Every rejected scan is an honest answer. Every valid scan is a result the system actually trusts.