This same procedure applies in more general circumstances
•More than two classes
•More than one dimension
General classification
H. Schneiderman and T.Kanade
Example:  face detection
•Here, X is an image region
–dimension = # pixels
–each face can be thought
of as a point in a high
dimensional space
H. Schneiderman, T. Kanade. "A Statistical Method for 3D Object Detection Applied to Faces and Cars". IEEE Conference on Computer Vision and Pattern Recognition (CVPR 2000)
http://www-2.cs.cmu.edu/afs/cs.cmu.edu/user/hws/www/CVPR00.pdf