google-photos
I have "Face grouping" enabled in my Google account and I can see around 10 faces successfully tagged when I go to my Albums. However, there's a lot of other people who are not tagged, as well as some unrecognized photos of people who are already tagged.
Is there a way to force Google Photos to run the facial recognition algorithm on a given photo, so that it adds new faces or maps a new photo to an existing face?
It is possible to enable it by dialling into a US VPN (or going to the USA) and enabling the feature.
I found out about it from here: https://www.reddit.com/r/androidapps/comments/37uepw/is_face_recognition_in_the_new_google_photos_app/
On Android, you can download a VPN client and run all of the device communication through the VPN.
On iOS, nute (the OP) travelled to the USA and enabled it there, so I can't currently confirm if the VPN settings work on iOS.
Instructions:
Android
iOS
If you have the Google Photos saved in your Google Drive, you should be able to install the Google Drive for Mac / PC to get the folder 'mounted' on your computer.
From there, you can use an application such as dupeGuru (which works on Mac and Windows). You should be able to scan the Google Photos folder within your Google Drive and find the duplicates.
dupeGuru Actions -- Do whatever you want with your duplicates. Not only can you delete duplicates files dupeGuru finds, but you can also move or copy them elsewhere. There are also multiple ways to filter and sort your results to easily weed out false duplicates (for low threshold scans).
Best Answer
Update: this feature has now been added to Google Photos! You can select any face and either create a new person or map it to someone in your library. Old answer below:
After waiting for a couple of weeks, the last ~two years worth of photos were analyzed correctly and new faces have been added to the library. However photos taken since before 2017 have not been autoprocessed after one month of waiting. Therefore I've had to trick Google Photos to think that I've uploaded new pics:
A few minutes after re-uploading the photos they should be correctly mapped to your faces library. After a couple of weeks Google Photos will parse any new people and add them to your faces library as well.