Pentax Optio WG-1 GPS Operating Manual page 22

This camera comes with a "Face Detection" function that spots the faces
in your shot and automatically adjusts the focus and exposure for the
faces. It can recognize up to 32 people per shot ('1), so it wilt help you
take perfect group shots too. It automatically releases the shutter when
people are smiling, and if anyone blinks, it tells you that. It also tells you
where faces are detected on the screen (*2), so you can take the shot
again until it is perfect. It also has a feature that lets you enlarge each
person's face in sequence during playback so you can quickly check
their facial expressions.
"1 Up to 31 face detection frames are displayed on the monitor.
*2 The camera can tell the position of up to 2 detected faces.
This camera includes Movie SR to reduce camera shake during movie
recording (p.153). It also supports 1280x720 H DTV so you can view
your recordings as stunning wide-screen movies.