Face recognition do not identify faces

[ERBRO]

Hello,

I started the face recongnition for all my data base. I work by blocks of about 1000 pictures and it works quite well.

Nevertheless, I stay with quite a large number of pictures for which imatch tells me "no face detected. Please poqition the face annotation manually" where in my opinion the face is quite evident (portrait in the middle of picture, no small face, etc)

I try to figure out how I could improve this.

Any idea ?

best regards
Eric

[Mario]

That's quite unusual for frontal faces. Send me an example so I can see it myself: support email address.
Include a link back to this topic since I get a lot of emails per day.

[ERBRO]

Hello,

I just sent the eMail with 2 examples.

Best regards
Eric

[Mario]

Thanks for sending in the images.
For the image "L1002500 resize.JPG" IMatch detects the faces, even when the person is wearing sun glasses.

The face in the image "L1002437_C1 resized.jpg" is not detected. My guess would be that's because the

a) eyes are a bit squeezed and quite small (eyes are important for face recognition)

b) the face is slightly unsharp, but only outside a very sharp oval approximately representing the face frontal. This look like an AI algorithm tried to "improve" the image, but failed.

c) The lighting is rather flat

d) The person is older and has many wrinkles (I apologize to the man)

All this can offset the face detection algorithms.

Luckily, in IMatch you are not dependent on the face AI working for all your files. You can just draw a manual face annotation and assign the person. From then on, this face/image will work with people-related features in IMatch. See Manual Face Annotations for more information.

[ERBRO]

Hello Mario,

thank you for the analysis. Based on this I will once all AI face recognition is done then select all pictures without annotations and visually control if there is are missing faces.

Best regards
Eric

[Mario]

Sounds like a good approach. You can use the People filter with the Files without faces option to quickly identify files where a face might have been missed.