Geisa Martins Faustino,  Luiz Henrique de Figueiredo. 

We present an algorithm that creates a mosaic effect for an image in an adaptive and automatic fashion. The algorithm is automatic because it does not need user intervention, except for the choice of a couple of parameters. The algorithm is adaptive because it creates tiles whose sizes are adapted to the features of the image. This is achieved by using a centroidal Voronoi diagram with a density function that emphasizes image features.

http://doi.ieeecomputersociety.org/10.1109/SIBGRAPI.2005.46

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