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 and libcvaux-dev packets 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

This is an early preview for testing purposes. Have fun playing.
A CLI version of this plugin is available here:
http://sites.google.com/site/elsamuko/c-cpp/opencv-facedetect