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Major challenge in automatic image annotation is bridging the semantic gap between the computable low-level image features and the human-like interpretation of images. The interpretation includes concepts on different levels of abstraction that cannot be simply mapped to features but require additional reasoning with general and domain-specific knowledge. The problem is even more complex since knowledge in context of image interpretation is often incomplete, imprecise, uncertain and ambiguous in nature. Thus, in this paper we propose a fuzzy-knowledge based intelligent system for image annotation, which is able to deal with uncertain and ambiguous knowledge and can annotate images with concepts on different levels of abstraction that is more human-like. The main contributions are associated with an original approach of using a fuzzy knowledge-representation scheme based on the Fuzzy Petri Net …