DNN face detector fails with images that have many faces

[Nghia Duong]

Hi all,

I was messing around with the face detection module when I found some
abnormal behaviors. DNN face detection module fails to detect faces in some
images that contain many faces, especially images that have faces align
horizontally. Furthermore, the overloaded functions prepareForDetection of
OpenCVDNNFaceDetector give different performances. For example, It cannot
detect any faces in the sample photo codingsprint2009-01.jpg in the folder
core/tests/facesengine/data.

Q: Has this kind of issue ever been reported? If not, could any of you help
me re-verify this problem?

Thank you in advance.

Best regards.
Nghia
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