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Research in content-based image retrieval is an expanding discipline with an accelerated growth in the last ten years. Advances in telecommunications and the huge demand of visual information on Internet and mobile devices is occupying the attention of the researchers in developing efficient systems to ease the task of useful visual information retrieval by the users. We present a semiautomatic image annotation process using the low-level image descriptor fuzzy color signature to extract the most similar images from an annotated database and frequent pattern mining to select the candidates keywords for annotating the new image. The idea is aimed at establishing a bridge between visual data and their interpretation using a weak semantic approach.