Best practices for using the application

rPPG - By Face

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

• Device:
• The device battery level should be at least 20% and not in power save mode.
• Ensure that your camera lenses are clean and unscratched
• The mobile device should be in a fixed position during the entire measurement.
• The device should be placed 30-40cm from the subject.
• The device should be at forehead height or higher and positioned perpendicular to the subject’s face.

• Subject:
• Each measurement set is for a single person.
• Sit or stand 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. 

• Measurement: 

• • Duration – The full measurement duration is 2.5 minutes.
  • Vital signs appearance - each vital sign appears when there is sufficient data. However, there may be cases in which a summary value is not available for some vital signs.

PPG - By Finger

When using the By Finger (PPG) mode, the following recommendations apply:

• 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: cover both the rear flashlight and camera with your index finger.
  • Android: without covering the rear flashlight, cover the rear camera with your index finger.
  • Apply moderate pressure when placing your finger on the camera.
  • Avoid moving your finger during the measurement.

• Environmental conditions:
  • Should not be in complete darkness.

• Measurement:
• Duration – The recommended duration for the finger measurement is 1.5 minutes (90 seconds).

Finger Placement for iOS devices when using PPG

Finger Placement for Android devices when using PPG