article_snippet.sent: As Apple explained: 'In one embodiment, the image is analysed for a facial profile of a human face, without regard to a specific user.
article_snippet.sent: In this case, the device will only need to determine that a human facial profile is present.'
article_snippet.sent: In another embodiment, detecting the user's face may also include verifying that the user is an authorised user of the device,' the files continued. '
article_snippet.sent: The predetermined facial profile may be determined from an image that was previously captured by the device's camera and stored in a storage of images of authorised users.'
article_snippet.sent: The patent also suggests this feature could be used by multiple users, in the way that multiple fingerprints can be added to The patent current Touch ID system. '
article_snippet.sent: In this case, the database of images of authorised users would contain an image for each  user,' each  user added. '
article_snippet.sent: To match a facial profile in the subsequent image, the device would have to compare the subsequent image to each image in the database. '
article_snippet.sent: This would work in a similar way to facial recognition, but is more secure and unique to an individual user.