Best Practices - How to take a measurement

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This article describes the best practices for taking a measurement
Wait 3 minutes between measurements to avoid device overheating

 

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.

 

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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.

Screen_Shot_2022-01-27_at_20.16.40.png

 

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