This plugin detects faces in an input image, based on the example of the OpenCV wiki:
Unzip the folder and type "make", you need the libcv-dev packet to compile the source code.
You will find the plugin then under Filters -> Generic -> Face Detection CV.
If you like it, hug someone.
Update1: Unlike in the preview, the source image will be unchanged in the final pass, the faces will be shown then as selections.
Update2: min_neighbors is 3 instead of 2
At the moment this plugin is just an early preview for testing purposes. Have fun playing.
A CLI version of this plugin is available here:
And also a version which does face recognition: