If you get a Signal-to-Noise Ratio (SNR) of less than 0.5 dB then DeepAffex will not be able to compute any results. Please try the following options to improve your SNR:

  • Avoid movement: Please remain as still as possible during the scan; small movements are acceptable but large movements will reduce the SNR. The camera should also remain stationary e.g., mobile phones should be in a stand.

  • Improve lighting: Make sure that your face is well lit with even lighting on both the left and right side and minimal shadows. Due to the physical basis of how TOI works, individuals with darker skin tones will need even more light incident on their faces than others.

  • Move closer to the camera: Move as close to the camera as possible while ensuring the face tracker can track you. If your device can be rotated, then rotate it so that your face is in portrait mode in the camera. The closer you are to the camera, the higher the SNR will be.

  • Remove obstructions from the face: Objects that block parts of the face may affect measurements. Please remove obstructions like eye-glasses, makeup, sunscreen, caps, jewelry etc.

  • Clean your camera lens: Often, phone, tablet and webcam lenses accumulate fingerprints, grease and dirt. Please clean your camera lens.

  • Try a different camera: Some cameras have sensors that introduce a lot of noise or don't provide a stable frame rate. If possible, please try using a different device.

Star Rating

Star Rating is an estimate of overall optical quality.

A high Star Rating may lead to a high SNR. But in some situations, SNR may be unrelated to Star Rating. This may happen because Star Rating is computed on the device and depends upon the image and camera information, whereas SNR is computed on the DeepAffex Cloud and depends upon blood-flow information.

We are working to improve the Star Rating to be a better indicator of signal quality.