Luiz Velho,  Jonas Gomes,  Marcos Vinícius Rayol Sobreiro. 

This paper presents a new quantization method for color images. It uses a local error optimization strategy to generate near optimal quantization levels. The algorithm is simple to implement and produces results that are superior than those of other popular image quantization algorithms.

http://sibgrapi.sid.inpe.br/rep-/dpi.inpe.br/ambro/1998/06.03.14.31

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