Guidance for indexing faces in common scenarios

Call IndexFaces with images which contain only one face in each image and associate the returned Face ID with the identifier for the subject of the image.

You can use DetectFaces ahead of indexing to verify there is only one face in the image. If more than one face is detected, re-submit the image after review and with only one face present. This prevents inadvertently indexing multiple faces and associating them with the same person.

You should call IndexFaces without restrictions on images that contain multiple faces in use cases such as family albums. In such cases, you need to identify each person in every photo and use that information to group photos by the people present in them.

Index multiple different images of the same person, particularly with different face attributes (facial poses, facial hair, etc), create a user, and associate the different faces to that user to improve matching quality.

Include a review process so that failed matches can be indexed with the correct face identifier to improve subsequent face matching ability.

For information about image quality, see Recommendations for facial comparison input images.