The images named horse.jpg, highdetails1.jpg, highdetails2.jpg, multiobj.jpg, noisy_horse.jpg are taken or derived from www.bigfoto.com.
The image named echalk.png is copyright by the E-Chalk Team.
The image named mushroom.jpg is copyright by D. Martin and C. Fowlkes and D. Tal and J. Malik. See Berkeley Segmentation for details.