How to use OpenCV face detection?

Created by: pmetras

How can we check the results of OpenCV face detection used for the creation of the thumbnails?

Even if I've installed python-opencv dependencies, some thumbnails are not centered on the face on the picture.

1. Is there a debug mode in the scanner to check that OpenCV is actually running?
2. When OpenCV runs, can we check the results of face detection? For instance, by drawing a square around the face it targeted in the original picture.

It would be good to have these debug options in the myphotoshare.conf file.