I am just trying to classify images using kNN algorithm with the aid of MATLAB. So now I am in need of some collection of images of peoples' faces. Where can I get some open database of faces (both females and males).
Here is an up-to-date index of face image databases commonly used by researchers.
It contains links to the common datasets such as The Yale Face Database (regular and "B"), The Color FERET Database, The AT&T Database of Faces, etc.
It should cover your needs.