The Haar face detection is very slow?

edit

hi. You can use opencv_traincascade instead of opencv_haartraining. opencv_traincascade supports both Haar & LBP features.LPB is several time faster than Haar. In addition opencv_traincascade can use TBB in multi core system. In the first you have to down sample original image. You can set four parameters in haar cascade in OpenCV that affects the speed 1- Scale Factor: how much the image size is reduced at each image scale (The speed-accuracy trade-off) 2- Min Neighbor 3- min Size (minimum size of face) 4 -max Size (minimum size of face)

Try reducing the image size.