Photosynth aggregates images already known to be of a particular scene and figures out how they fit together. This paper is about taking an image from an unknow

Photosynth aggregates images already known to be of a particular scene and figures out how they fit together. This paper is about taking an image from an unknown place and identifying whether it is of a particular landmark. Both probably make heavy use of unsupervised clustering techniques on images but are otherwise totally different use cases, if nothing else.