digital face @copy bitsys.gr
Today checking my daily Tweets for development I have found a very good tutorial about face detection using the GD library from PHP.
Karthik Tharavaad have developed a class that will allow you, with very little commands, to detect a face in a photo. As shown on the end of the post, it works well.
More at the post: @Karthik Tharavaad – Face detection with PHP
Post source got from Twitter: @planetphp
Amazon MP3 Store
PHP Libraries, API's and Frameworks 
December 5th, 2009 at 2:57 PM
You can create valid passport photos with http://idphoto4you.com website.
It uses face detection to set size and position of head.
It is free.
It knows numerous standards.