https://bugs.kde.org/show_bug.cgi?id=498603

            Bug ID: 498603
           Summary: Face detection feature stopped working.
    Classification: Applications
           Product: digikam
           Version: 8.5.0
          Platform: Neon
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Maintenance-Faces
          Assignee: digikam-bugs-n...@kde.org
          Reporter: hsan...@gmail.com
  Target Milestone: ---

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SUMMARY

Running detect faces on any collection returns zero faces even for photos where
faces are close and clear. This used to work perfectly before.

STEPS TO REPRODUCE
1. Use scan for faces in any collection.
2.
3. 

OBSERVED RESULT

 See there is always zero faces detected.

EXPECTED RESULT

Some faces should be detected.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Operating System: KDE neon 6.2
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.1
Kernel Version: 6.8.0-51-generic (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 8745HS w/ Radeon 780M Graphics
Memory: 19.3 GiB of RAM
Graphics Processor: AMD Radeon Graphics


ADDITIONAL INFORMATION

I ensured the required binary files are downloaded in
`$HOME/.local/share/digikam/facesengine` and in Digikam settings the download
button is disabled with a message saying all files on the selected features
were found.

Running digikam from a terminal I can see these errors show whenever I run face
detect tool on any collection:

```
runner plugins: QList(Marble::CachePlugin(0x57b9c03f6890),
Marble::GpsbabelPlugin(0x57b9c03f5d40), Marble::GpxPlugin(0x57b9c03fa250),
Marble::JsonPlugin(0x57b9c04fbd60), Marble::KmlPlugin(0x57b9c03fe250),
Marble::OsmPlugin(0x57b9c0535a80), Marble::Pn2Plugin(0x57b9c040b2d0),
Marble::PntPlugin(0x57b9c0411040))
[ERROR:0@126.286] global ./modules/dnn/src/net_impl.cpp (1168)
getLayerShapesRecursively OPENCV/DNN: [Eltwise]:(onnx_node!Add_44):
getMemoryShapes() throws exception. inputs=2 outputs=1/1 blobs=0
[ERROR:0@126.286] global ./modules/dnn/src/net_impl.cpp (1174)
getLayerShapesRecursively     input[0] = [ 1 64 38 29 ]
[ERROR:0@126.286] global ./modules/dnn/src/net_impl.cpp (1174)
getLayerShapesRecursively     input[1] = [ 1 64 38 28 ]
[ERROR:0@126.286] global ./modules/dnn/src/net_impl.cpp (1178)
getLayerShapesRecursively     output[0] = [ 1 64 38 29 ]
[ERROR:0@126.286] global ./modules/dnn/src/net_impl.cpp (1184)
getLayerShapesRecursively Exception message: OpenCV(4.6.0)
./modules/dnn/src/layers/eltwise_layer.cpp:251: error: (-215:Assertion failed)
inputs[vecIdx][j] == inputs[i][j] in function 'getMemoryShapes'

kf.notifications: No event config could be found for event id "FacesDetector"
under notifyrc file for app "digikam"
kf.notifications: No event config could be found for event id "FacesDetector"
under notifyrc file for app "digikam"
[ERROR:1@143.961] global ./modules/dnn/src/net_impl.cpp (1168)
getLayerShapesRecursively OPENCV/DNN: [Eltwise]:(onnx_node!Add_44):
getMemoryShapes() throws exception. inputs=2 outputs=1/1 blobs=0
[ERROR:1@143.961] global ./modules/dnn/src/net_impl.cpp (1174)
getLayerShapesRecursively     input[0] = [ 1 64 38 29 ]
[ERROR:1@143.961] global ./modules/dnn/src/net_impl.cpp (1174)
getLayerShapesRecursively     input[1] = [ 1 64 38 28 ]
[ERROR:1@143.961] global ./modules/dnn/src/net_impl.cpp (1178)
getLayerShapesRecursively     output[0] = [ 1 64 38 29 ]
[ERROR:1@143.961] global ./modules/dnn/src/net_impl.cpp (1184)
getLayerShapesRecursively Exception message: OpenCV(4.6.0)
./modules/dnn/src/layers/eltwise_layer.cpp:251: error: (-215:Assertion failed)
inputs[vecIdx][j] == inputs[i][j] in function 'getMemoryShapes'

kf.notifications: No event config could be found for event id "FacesDetector"
under notifyrc file for app "digikam"

```

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