Summary of face detection using a library (OpenCV / dlib) in Python By the way
--Face detection: Estimating the part where the face appears from the image or video. --Face recognition: Estimating who the face appears in an image or video
It seems that OpenCV is Haar-Like + Adaboost and dlib is HoG + SVM for face detection.
Summary of findings on face detection with OpenCV, Dlib and OpenFace
You can get an overview by reading the following.
Object detection by local features and statistical learning method
Recent methods using deep learning are as follows
Paper introduction: Fast R-CNN & Faster R-CNN
OpenCV
Face detection with Python + OpenCV
Comparison of face detector performance with Python + OpenCV
Face detection with Python + OpenCV (rotation immutable)
dlib
Face detection with Python + dlib
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