mtcnn
1.
https://github.com/MirrorYuChen/ncnn_example/tree/105d6ab5f797f7249a53c4d51c5961f52a731412
ios
https://github.com/xuduo35/ncnn-mtcnn-facenet/iOS/FunAlbum/NCNNWrapper.mm
python ncnn
#include "facerecognition.h" cv::Mat getsrc_roi(std::vector<cv::Point2f> x0, std::vector<cv::Point2f> dst)
https://github.com/nxp-gf/ncnn-face-recognition/