Bug 449195

Summary: Faces not detected on group photos
Product: [Applications] digikam Reporter: spam-receiver
Component: Faces-DetectionAssignee: Digikam Developers <digikam-bugs-null>
Status: RESOLVED WORKSFORME    
Severity: normal CC: metzpinguin
Priority: NOR    
Version First Reported In: 7.5.0   
Target Milestone: ---   
Platform: Microsoft Windows   
OS: Microsoft Windows   
Latest Commit: Version Fixed/Implemented In: 7.6.0
Sentry Crash Report:
Attachments: Sample picture
Faces-detected.jpg

Description spam-receiver 2022-01-26 12:14:59 UTC
Created attachment 145950 [details]
Sample picture

SUMMARY
Some faces are not detected on group pictures.


STEPS TO REPRODUCE
1. A picture of a (small) group, people standing, looking into the camera.
2. Load the picture to Digikam and open it
3. Run "Face detection" on the picture

OBSERVED RESULT
No faces are detected.

EXPECTED RESULT
Faces of all persons on the picture are deteted.

SOFTWARE/OS VERSIONS
Windows: Win10
Digikam 7.5.0 (and earlier)

ADDITIONAL INFORMATION
Attached a sample picture found in the internet:
https://www.pic-upload.de/view-34040153/Singers_Gruppenfoto_April_2017.jpg.html
Comment 1 Maik Qualmann 2022-01-26 12:30:25 UTC
In People sidebar there is a settings tab, enable Yolo V3 face detection. Then all faces in the group photo will be detected.
I tested it with their image, all faces are detected.

Maik
Comment 2 Maik Qualmann 2022-01-26 12:37:49 UTC
Created attachment 145952 [details]
Faces-detected.jpg

Screenshot from the face detection.

Maik
Comment 3 spam-receiver 2022-01-26 13:04:25 UTC
After this change, will Digikam re-scan all pictures?
Comment 4 Maik Qualmann 2022-01-26 13:10:11 UTC
digiKam will not automatically scan all images. You will need to rescan any or all of the images. The Yolo V3 engine is not activated by default because it is significantly slower. Its big advantage is that it detected (almost) all faces.

Maik
Comment 5 spam-receiver 2022-01-26 14:10:51 UTC
(In reply to Maik Qualmann from comment #1)
> In People sidebar there is a settings tab, enable Yolo V3 face detection.
> Then all faces in the group photo will be detected.
> I tested it with their image, all faces are detected.
> 
> Maik

Thank you very much. Switching to Yolo v3 solved the issue.