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Item Digital Mosaic Frameworks - An Overview(The Eurographics Association and Blackwell Publishing Ltd, 2007) Battiato, S.; Di Blasi, G.; Farinella, G. M.; Gallo, G.Art often provides valuable hints for technological innovations especially in the field of Image Processing and Computer Graphics. In this paper we survey in a unified framework several methods to transform raster input images into good quality mosaics. For each of the major different approaches in literature the paper reports a short description and a discussion of the most relevant issues. To complete the survey comparisons among the different techniques both in terms of visual quality and computational complexity are provided.