[digiKam-users] Face recognition

[Ronald Orenstein]

I have had some excellent online help from a list member in response to my last post, but I wanted to bring my further query to the wider list and the developers.
I was running v. 6.4 for mac, and had used it to tag a large number of faces, many of which I identified manually.  Following advice, I updated to version 7.0 for mac, which I realize uses a different algorithm for face recognition.  As I did not want to have to retag hundreds of images, I did not delete tags made under the earlier version, but rescanned a few folders with the setting on 'scan again and merge results' and 'recognize faces'.  The new scan, however, placed all newly-scanned files under 'unknown'.  I retagged a large number of faces, mostly showing my wife, and tried a further scan on the same settings (but using the scan command under tools>maintenance) expecting that it might now learn from these newly-tagged files and recognize the faces of my wife at least. 
Unfortunately, the program crashed before completing the scan, but not before adding a few thousand new faces.  However, once again almost all of these, including my wife's face, were placed under 'unknown' rather than being recognized; the few placed under 'unconfirmed' were wrongly identified.  Rescanning individual files had no effect.  This makes me wonder if the recognition feature is working (or if I am doing something wrong).
Further, under both 6,4 and 7.0 the scan is failing to detect many faces in photos with more than one person even though these are (as far as I can tell) every bit as large and clearly visible as the ones it does detect.  I tried rescanning the same files repeatedly with different sensitivity settings, from 0-100%, but the results were always the same.  Is there anything I can do about this short of manually adding faces to thousands of files?
Thanks for assisting me with this.
Ronald Orenstein
1825 Shady Creek Court
Mississauga, ON L5L 3W2
Canada
ronorenstein.blogspot.com
ronorensteinwriter.blogspot.com 


  
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