The Fractal Mosaic algorithm is a rotation, scale, and translation invariant photomosaic algorithm. While traditional photomosaics create a larger image out of smaller square images on a rectangular grid, Fractal Mosaics creates a larger image out of rectangular images that can be placed at arbitrary locations, can be scaled to any size, and can be rotated by any angle.
This is accomplished with a combination of image search (i.e. image retrieval) algorithms and an image registration algorithm developed with NASA funding by George Wolberg Siavash Zokai at the City College of New York (pdf).
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