https://bugs.kde.org/show_bug.cgi?id=457225

            Bug ID: 457225
           Summary: Make use of existing people tags
           Product: digikam
           Version: 7.7.0
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: wishlist
          Priority: NOR
         Component: Faces-Detection
          Assignee: digikam-bugs-n...@kde.org
          Reporter: sven.burmeis...@gmx.net
  Target Milestone: ---

SUMMARY
If one has a collection which does already have people tags, digikam does not
make any use of this information it for its face detection/recognition. That
seems inefficient.

STEPS TO REPRODUCE
1. Add people tags to pictures (with digikam)
2. Start digikam from scratch and point it to the collection created above. The
people tags are imported and shown in the tags tab.
3. Open the people tab

OBSERVED RESULT
1. no people are shown, although the tag tree features people. There is just
unconfirmed, unknown and ignored.
2. starting a search for faces and link tags to faces afterwards, starts from
scratch and does not re-use any information provided by the existing people
tags

I assume this is because the information about the face location is missing and
digikam only knows that there is a person on the picture but not where.

EXPECTED RESULT
1. Show all names from the people tag tree in the face recognition, empty. This
saves having to type each people tag again.
2. If only one face is found on a picture and the picture has a people tag, put
that picture in the "unconfirmed" section of the people tag - not in the
"unknown" section. That way the user can quickly educate the engine with
"pre-tagged" pictures one only has to confirm.
3. Add an option to only scan for faces on pictures with a people tag. This way
the "unknown" and "unconfirmed" section is filled quicker and the user can
educate the engine quicker.

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