P: Allow facial recognition feature to re-index a folder/collection

Two issues:
a) Reindexing photos - having LR clear and re-draw face regions on photos to allow people to fix mistakes (undelete, etc.)
b) Forcing LR to re-run matching logic on 1000s of faces that it guesses matches incorrectly. I've tagged 20K faces and some individuals have 100s of example faces tagged. I still have about 15K faces to go, but the match accuracy on these last images is poor (maybe 10%) instead of getting better. I want force LR to rerun the comparison logic of these labeled faces considering the faces already tagged. LR asking if my blonde niece is my dark haired son may have been acceptable at the start of the process, but I have 5K images tagged with my son, and 300 images tagged of my niece. Mismatches at this point is unacceptable.
b) Picasa offers an adjustable scale of the criteria to make a match. Such a tool could be helpful.

Thanks, this indeed works as a workaround. Adobe should really implement the reindexing though!

I was amazed not to find this re-scan functionality in the tutorial video so I had a look in the manual - and did not find it. Couldn't believe it so I searched and found the discussion - and this request which I believe is really needed for a smooth use of facial recognition.

You know, if I actually had the time (which I don't) it wouldn't be that hard to go into the LR6 database, find out which tables & fields are marking a photo as "skip_facial_recognition", and just unmark them en masse with an sql lite database editor. But, this should be Adobe's job. Thanks for the tip!

I've tested this on small sets of 20-30 images using bulk select/actions. Rotating once triggers a rescan which picks up some faces, rotating back to original orientation forces another rescan which picks up the rest. Not the most elegant fix, but it works for me. 🙂

A rotate that doesn't affect the provisos originals can do this?

Here's a rescan work around. Try rotating your images!

You may have to rotate them back, but this seems to trigger the Face reognition process again.

I made the big mistake of deleting the face catalogue accross my entire library after my PC virtually stopped responding. Apx 50,000 faces had been detected but not labelled, and the ID/naming process was so painfuly slow I figured what harm could it be starting fresh again. Little did I realise that face recogition was a one trick pony, and once run, couldn't be re run again. I'm sure many others have been tripped up by this, and find it hard to imagine how Adobe engineers could have designed the UI with such a glaring ommision.

Anyway, give it a go - YMMV. 🙂

"right click" access to a "rescan this image for faces" menu item in the library module would make my workflow much smoother.

Need this function as well.

I second that...