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Scott, I've been keeping an eye on your thread on ros-users.

I've written a small package "face_builder" to detect faces using OpenCV and return a clustered point cloud of the face. It works as a stand-alone node, but it should also work as a library. It publishes clustered faces on the "faces" topic (type: sensor_msgs/PointCloud2) and publishes a "detected_faces" image for debugging.

It builds against trunk of PCL right now and ROS Diamondback. If you need to patch it to get it to build, let me know.

Not having a great place to put it, I uploaded it to the "PR" wiki: http://pr.willowgarage.com/wiki/Useful_general_references Look for "face_builder.tar"

Let me know what you find with face recognition.