Best Practices - How to take a measurement

rPPG - Face scan

In order to get accurate vital-sign readings, follow the guidelines below:

Device

• Ensure battery level is above 20% and not in power-save mode.
• Ensure your camera lenses are clean and unscratched.
• Place device on a stand about 30 cm away from your face.
• Position the device at forehead height or above, with the camera facing you.

Subject

• Sit still during the measurement.
• Make sure your face is fully exposed, ensuring it is not covered by hair or accessories (i.e., mask, sunglasses, hat).
• Avoid moving or talking throughout the measurement and remain focused on the screen until the measurement is complete.

Environmental Conditions

• There should be no light source behind you.
• Ensure neither the camera nor the area in the frame is exposed to direct sunlight.
• Avoid movement of other persons behind or within your vicinity.
• Avoid highly reflective objects in the surrounding area, including mirrors, glass windows, tables, etc.
• It is recommended to use a cold light (>4500K) and not a monochromatic light source.
• The light in the room should be uniformly distributed, with a minimal light level of 400 lux illuminating your face.

PPG - Finger scan

When using the By Finger (PPG) mode, following these best practice guidelines:

Device

• Ensure battery level is above 20% and not in power-save mode.
• Ensure your camera lenses are clean and unscratched.
• Keep your mobile device in a fixed position throughout the entire measurement.
• The device should be held by hand.

Subject

• Remain at rest throughout the measurement.
• Hold your phone in a comfortable position at heart level.
• iPhone users: cover both the rear flashlight and camera with your index finger.
• Android users: cover the rear camera with your index finger without covering the rear flashlight.
• Apply moderate pressure when placing your finger on the camera.
• Avoid moving your finger during the measurement.

Environmental Conditions

• Measurements should not be taken in complete darkness.