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• Locate the face in the image:

  • To locate the face, you can use detection (for a single image) or tracking (for a series of images from a camera feed).

    • See function VisageSDK::VisageTracker::track() or VisageSDK::VisageFeaturesDetector::detectFacialFeatures().

  • Each of these functions returns the number of faces in the image - if there is not exactly one face, you may report an error or take other actions.

  • Furthermore, these functions return the FaceData structure for each detected face, containing the face location.

• Use VisageFaceRecognition.AddDescriptoraddDescriptor() to get the face descriptor and add it to the gallery of known faces together with the name or ID of the person.

  • The descriptor is an array of short integers that describes the face - similar faces will have similar descriptors.

  • The gallery is simply a database of face descriptors, each with an attached ID.

    • Note that you could store the descriptors in your own database, without using the provided gallery implementation.

• Save the gallery using VisageFaceRecognition.SaveGallery().

Matching

An this stage, you match a new facial image (for example, a person arriving at a gate, reception, control point or similar) against the previously stored gallery, and obtain IDs of one or more most similar persons registered in the gallery.

• First, locate the face(s) in the new image.

  • The steps are the same as explained above in the Registration part. You obtain a FaceData structure for each located face.

• Pass the FaceData to VisageFaceRecognition.ExtractDescriptor() to get the face descriptor of the person.

• Pass this descriptor to VisageFaceRecognition.Recognize(), which will match it to all the descriptors you have previously stored in the gallery and return the name/ID of the most similar person (or a desired number of most similar persons);

  • the Recognize() function also returns a similarity value, which you may use to cut off the false positives.

How do I perform verification of a live face vs. an ID photo?

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