The Graphics Group has released a new online tool which allows users to extract textures from unconstrained Images. The tool, which is available on the new graphics service site, allows a user to upload photos, and provides a simple wizard to guide them in the extraction process. A step by step tutorial is also available. The tool is based on the work described in Yale Computer Science Technical Report 1483.
You can find the tool at: http://graphics.cs.yale.edu/graphics_services/content/texture-extraction
Technical Report 1483 is also available: http://graphics.cs.yale.edu/site/tr1483