rPPG - Face scan

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

Device

• Ensure the battery level is above 20% and not in power-save mode.

• Ensure your camera lenses are clean and unscratched.

• Place the device on a stand about 30 cm away from your face.

• Position the device with the selfie camera at eye level and parallel to the face.

• Use a stand to reduce shaking and movements of the device.

Subject

• Sit still during the measurement.

• Ensure your feet are placed flat on the floor and your legs are
  uncrossed.

• 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

• Ensure your face is evenly illuminated

• Avoid measuring in locations with multiple light sources (preferably a
  single light source directed towards the face).

• Settle into a position where no light sources are directed toward the
  camera (e.g., by sitting against a wall).

• 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.

• Ensure the level of the light illuminating your face is a minimum
  of 400 lux.

• It is recommended that you use a cold light (>4500K) and not a
  monochromatic light source.

External Sensor Devices

Currently, the SDK supports the Polar Verity Sense device.

Mobile Device

1. Ensure that your mobile device has a battery level above 20% and is
   not in power-saving mode.

2. Stay within the Bluetooth® range of your smartphone throughout the
   measurement to avoid connection or signal disruptions.

Polar Verity Sense Sensor

1. Ensure that your Polar Verity Sense™ battery is sufficiently charged.

2. Turn on your Polar Verity Sense™ by pressing the silver button located
   on the side of the sensor.

3. Verify that there is a green light visible on the back of the sensor.

4. Pair your Polar Verity Sense™ with your smartphone via Bluetooth®.

5. Wear the Polar Verity Sense™ snugly over clean skin on the
   outer-center part of your non-dominant upper arm and fasten the
   band securely.

6. Ensure the sensor is in direct contact with your skin (underneath
   clothing). Avoid placing it over tattoos or adjusting it during the
   measurements.

7. When putting on the armband, ensure that the device’s power button
   is facing upwards and that the “POLAR” label on the device is not
   upside down. This ensures that the sensor is positioned properly on
   your skin.

Subject

1. Act naturally during the measurement. Avoid unnecessary movements
   or adjustments to the sensor on your skin.