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Focused places of a photo act as a significant cue for image concept discovery and quality assessment. Therefore, to find them is an important issue. In this paper, we design a focusing degree detector by which a focusing degree map is generated for a photograph. The results could be used to obtain focused places of photographs. As a concrete example of their applications, image retrieval and image quality assessment are investigated in this work. The experimental results show that the retrieval algorithm based on this detector and map can get more accurate retrieval results and the proposed assessment algorithm has a high ability to discriminate photos from low quality to high quality. [ABSTRACT FROM AUTHOR]