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you can do this only with the LBP face regognizer.

but you probably should not append stuff to the xml file, instead:

• load the existing one

• call reco->update(images,labels); with your new data

• save it again

you can do this first of all, appending faces only with makes sense for the LBP face regognizer.recognizer.

but and you probably should not (manually) append stuff data to the xml file, instead:

• load the existing one

• call reco->update(images,labels); with your new data

• save it again