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Another wild idea, called dual photography, comes from Hendrik P. A. Lensch, now of the Max-Planck-Institut für Informatik in Saarbrucken, working with Stephen R. Marschner of Cornell University and Pradeep Sen, Billy Chen, Gaurav Garg, Mark Horowitz and Marc Levoy of Stanford. Here's the setup: A camera is focused on a scene, which is illuminated from another angle by a single light source. Obviously, a photograph made in this configuration shows the scene from the camera's point of view. Remarkably, though, a little computation can also produce an image of the scene as it would appear if the camera and the light source swapped places. In other words, the camera creates a photograph that seems to be taken from a place where there is no camera.

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Two floral images are both photographs—given a broad definition of "photograph." The top image was made with a conventional digital camera; below, a modified camera recorded the same vase of flowers but then applied edge-recognition algorithms to extract the three-dimensional structure of the scene; the camera rendered the image in a more painterly style. This method of "non-photorealistic photography" was devised by Ramesh Raskar of the Mitsubishi Electric Research Laboratory and several colleagues.]]>http://www.plime.com/plime-com/l/50050/1/rss2_0.rss#q2http://www.plime.com/plime-com/l/50050/1/rss2_0.rss#q2plime.com