Windows 10: Microsoft Photos app not recognizing faces in photos

I use Microsoft.Photos to manage all my photos (about 20K files). When i first checked possibilities using this tool, i was suprised to see that thousands of good face detection for many persons had been done automatically.

For exemple i got around 2300 detection concerning me, in spite of Lightroom detected about 2700 (but improved by manual confirmation).

The problem was the size of my collection, about 80 GB, because i'm not a photograph, this was only slowing Lightroom and other detections tools, so i decided to convert them using xnview to compress and obtained a 20 GB collection size.


Then i decided to reset Microsoft.Photos to see if it detect more faces, hoping it approches lightroom results. A really bad idea..

I never got again a working face detection... Concerning me, it detects between 80 and 120.. instead of the 2300 or more..


I tried many things :

- reset app using parameter option many times

- repaired the app using parameter option
- created a new local account and tried detection

- tried detection on another computer (linked to my account)

- deleted the app and reinstalled using appxpackage install

- tried windows insider with latest updates


There are no logs explaining what's happening with this uwp apps.

I dont understand what's the problem. Did the conversion make my photo unreadable by recognation (Microsoft cognitive services ?).

However I can see them correctly in Photos or some other tools with same quality as the olders ...


Hope some help




***Modified title from: Since reset of Microsoft.Photos, face detection degraded a lot***

:)

 

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Specs:

Microsoft Photos: 2018.18051.17710.0

OS Name: Microsoft Windows 10 Home

Version: 10.0.17134 Build 17134

 

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