Eitz et al. present an image descriptor that works both on a sketch (line drawing) and a processed image where the edges have been enhanced and isolated. The descriptor can be used to do sketch-based search over a large database of images.
Merging the sketch and image worlds is a pretty cool idea. If I know vaguely what an image looks like (or what I want an image of), then I should be able to draw a quick sketch of that image and get a real image as the result.
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