Hi,
When I use cv2.CascadeClassifier.detectMultiScale, I find that no face is detected in the original photo, but one face is detected in the flipped one.
OpenCV version 3.3.0 with a Python interface. All parameters used default values with the pre-trained classifiers configuration file (https://github.com/opencv/opencv/blob/master/data/haarcascades/haarcascade_frontalface_default.xml)
Is this an issue? What is the reason behind it?