Biometrics iOS
1.4
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Image Guidelines

The Sybrin Biometrics SDK is not able to overcome the laws of physics and works exclusively within its capabilities.
For the Sybrin Biometrics SDK to work at its full potential it is important to follow the image input guidelines as stated below. Each section contains good and bad examples to help visualize any issues you might experience regarding bad lighting, misalignment, focus, etc.

Angle

Unless explicitly requested by the SDK, such us in Liveness Detection, the face should not be tilted or turned more than 10 degrees in any direction or orientation.
Correct
Incorrect - tilted left
Incorrect - turned sideways
Incorrect - tilted upwards
Incorrect - tilted downwards

Distance

Ensure that the face does not take up too much or too little of the screen real-estate. A good ratio to aim for is to keep the face between 50% and 70% of the screen real-estate.
Correct
Incorrect - too far
Incorrect - too far

Focus

The face should be in focus and not blurred.
Correct
Incorrect

Lighting

Ensure the image has proper lighting. Avoid over exposure, under exposure, too much or too little background or foreground lighting, glares, and reflections.

Background lighting

Light coming from behind the subject can affect with the lighting conditions on the face, interfering with the normal operations of the SDK.
Correct
Incorrect - digital light
Incorrect - normal light
Incorrect - sun

Over exposure

Correct
Incorrect

Split lighting

Improper light balance or shadows on the face, can interfere with the normal operations of the SDK.
Correct
Incorrect

Under exposure

Correct
Incorrect

Obstructions

Remove all facial accessories and obstructions, as these can prevent the SDK from detecting all the necessary facial details. These include, but are not limited to:
  • Glasses
  • Hats
  • Headphones
  • Hoodies
  • Masks
  • Hair in front of the face
Correct
Incorrect
Incorrect - glasses
Incorrect - hat
Incorrect - headphones
Incorrect - hoodie
Incorrect - mask

Position

The face should be centered in the middle of the frame and no details should be cut off.
Correct
Incorrect - off center
Incorrect - cutoff

Resolution

The image resolution should be at least 1280x720. However, 1920x1080 is recommended.
Correct
Incorrect