Face detection and recognition parameters

[Pierre DELGOVE]

Hi Michael and Gilles,

I've just updated Digikam with the latest Appimage and done some tests : 
face recognition is very fast and accurate. Good work !

libOpenCV version is 4.11.0

Thanks.

Pierre

Le 2025-03-20 14:15, Gilles Caulier a écrit :

> Well it's simple: Pierre needs to run the 8.6.0 Linux AppImage bundle 
> or the Windows installer 8.6.0 that we provide...
> 
> Best
> 
> Gilles Caulier
> 
> Le jeu. 20 mars 2025 à 13:31, Michael Miller <michael_miller at msn.com> a 
> écrit :
> Hi Pierre,
> This is what I suspected.  digiKam needs OpenCV version 4.10.0 or later 
> for face recognition to work properly.
> 
> Please let us know if you need help upgrading to OpenCV 4.10.0.  I 
> think Gilles or Maik can help.
> 
> Cheers,
> Mike
> 
> On Mar 19, 2025, at 11:27 PM, Pierre DELGOVE <dp8700 at zaclys.net> wrote:
> 
> Hi Michael,
> 
> LibOpenCV version is 4.6.0
> 
> Regards.
> 
> Pierre
> 
> Le 2025-03-19 14:05, Michael Miller a écrit :
> Hi Pierre,
> To what version of OpenCV digiKam is using, go to Help->Components 
> Information->Libraries->LibOpenCV.
> 
> Cheers,
> Mike
> 
> On Mar 19, 2025, at 8:22 AM, Pierre DELGOVE <dp8700 at zaclys.net> wrote:
> 
> Hi Michael,
> 
> I saw yesterday that the 8.6.0 was just released. I have to update it.
> 
> I'm using KDE Neon with KDE 6.3.
> 
> "What version of OpenCV is installed?"
> 
> I don't know. I have to check it later (I'm not in front of this 
> computer by now).
> 
> How do I check which version of OpenCV is used (if it is correctly 
> installed) ?
> 
> Regards,
> 
> Pierre
> 
> Le 2025-03-19 11:02, Michael Miller a écrit :
> Hi Pierre,
> Please try using version 8.6.0.  It was released on 16 March. In 
> version 8.6.0 we removed SSD, YOLO, and OpenFace from face detection.  
> YuNet and SFace are much more reliable.
> 
> YuNet not detecting faces is usually because of an older version of 
> OpenCV installed on your computer.  What operating system are you 
> using?  What version of OpenCV is installed?
> 
> Cheers,
> Mike
> 
> On Mar 19, 2025, at 5:45 AM, Pierre DELGOVE <dp8700 at zaclys.net> wrote:
> 
> Hi everybody !
> 
> Due to the fact that Digikam Documentation is not quite up-to-date, I'm 
> doing some tests using face detection, tagging and recognition in 
> Digikam.
> 
> I have some questions about this function :
> 
> - about face detection algorithms, I've tested the three options 
> (YuNet, YOLOv3 and the third one I don't remember about). Yunet does 
> not detect any face although I ran it on a photo album full of faces 
> (family photos). The different options (very small, small, medium 
> sized, and so on) do not change the result. This algorithm is pretty 
> useless in my opinion OR I missed something.
> 
> YOLOv3 is very efficient and detect nearly every face in the photos.
> 
> The third option provide the same results as YOLOv3.
> 
> Question : is there an option to prefer between these two algorithms ?
> 
> - about face recognition (after face tagging) and confirmation of a 
> number of faces, there are two options in the settings : Sface and 
> Openface.
> 
> What are the difference between these options ?
> 
> Is it possible to shift from one algorithm to another ?
> 
> What are the consequences then ?
> 
> It is said in the documentation that face recognition algorithms begin 
> to recognise faces with a few tagged faces confirmed.
> 
> I found that one needs to confirm much more than 10-20 tagged faces to 
> have some reliable results in the people view.
> 
> Thanks in advance for answering and helping.
> 
> Pierre
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