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
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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 close	Incorrect - too far
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Focus

The face should be in focus and not blurred.

Correct	Incorrect
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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 white	Incorrect - normal light	Incorrect - sun
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Over exposure

Correct	Incorrect
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Split lighting

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

Correct	Incorrect
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Under exposure

Correct	Incorrect
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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
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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
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Resolution

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

Correct	Incorrect
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