Capture Standard
Capture standard
Liveness check and face comparison are the two primary functions of the FaceSign SDKs.
There are 2 types of face data used on the FaceSign platform. Single-frame 2D images and 3D face scans. It is possible to mix and compare the 2 data types to perform various checks, for example:
3D:3D comparison: FaceSign uses a stored 3D scan to compare with another 3D scan.
3D:2D comparison: FaceSign compares a stored 3D scan with a single-frame 2D image such as a photo or a valid identity document.
2D:2D comparison: FaceSign compares a single-frame 2D image with another single-frame 2D image. This scenario is identical to the traditional facial recognition and comparison systems model.
Accepted standards
For obtaining and sending images, the ICAO standard is used. The ICAO (International Civil Aviation Organization) standard consists of characteristics for a photograph to be in compliance with the following requirements and recommendations defined for capture and image submission settings:
Images in JPEG or PNG format;
Images captured in color;
Face positioning and additional information:
The photo must be taken facing forward - look directly at the camera and keep your head straight. The face should be centered. The shoulders should be aligned, parallel to the camera image plane.
The eyes must be naturally open; pupils and irises should be visible, with possible exceptions due to ethnicity or specific individual reasons.
Glasses - the photo should be captured without glasses. If it is impossible not to wear glasses, the dropout by the biometric engine is intensified.
No hat or cap - the face area must be clearly visible. Hats or caps are not allowed except for religious reasons. In those cases, veils, scarves, or head coverings should be handled carefully so as not to obscure any facial features or create shadows.
Neutral expression - the face should have a neutral expression; the person should not smile, raise their eyebrows, squint, or frown.
Hairstyle - hair should not cover the eye visibility area.
Lighting and background: Light, noise-free background. The background should be plain and without texture. It should not contain stains, lines, or curves that become visible in the captured image. Light colors such as light blue or white may be used provided there is sufficient distinction between the face/hair area and the background. Camera color settings should not be changed depending on the background color. There should be no shadow behind the face image. There should also be no visible objects in the background, such as people, furniture, patterned wallpaper, or plants. Lighting must be adequate and uniform, distributed equally across the face so there is no difference between the left and right sides. The photo must have brightness and good contrast between hair, face, and background. Poorly lit photos are those where lighting is only from the side, from above, or from below.
Example photos inside and outside the standard
Photo quality
The photo must have the following characteristics:
close-up of your head and above your shoulders so that your face occupies 70–80% of the photograph;
sharp focus;
high resolution without ink marks or creases.
Photos should:
show you looking directly at the camera;
show your natural skin tones;
have appropriate brightness and contrast;
be printed on high-quality paper and in high resolution.
Photographs taken with a digital camera should have high-quality colors and be printed on photographic quality paper.
Style and lighting
Photos should have the following characteristics:
have natural color;
show your eyes open and visible - no hair covering the view;
show you facing the camera, not looking over your shoulder (portrait style) or tilted, and show your face clearly;
be taken with a plain, light-colored background;
be taken with even lighting and not show shadows or flash reflections on your face and without red eyes.
Glasses and head coverings
If you wear glasses:
the photograph must show your eyes clearly without flash reflection on the lenses, and without dark lenses (if possible avoid heavy frames - use glasses with simple frames if you have them);
ensure that the frame does not cover any part of your eyes.
Head coverings:
Not allowed except for religious reasons, but your facial features from the tip of the chin to your forehead and the edges of your face need to be clearly visible.
Note: text and images taken from the documentation "ICAO guide for MRTD Photo Guidelines. ICAO. Icao guide for mrtd photo guidelines".
Support and Contact
For technical support or questions, use the FaceSign Admin Portal or contact our team through the official channels.
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