Although there are many information retrieval systems, few systems for retrieving in information of objects in real worlds can be used in mobile environments. In this paper, we describe an image retrieval system of flowers that can be used easily in mobile environments. Using a mobile phone, we transmit a flower image, simple characteristics of the flower and its positional data to an image retrieval server, and we confirm the result of retrieval using the mobile phone. We improved the search system by changing the database and an extraction range of a color, and by introducing narrowing down by size. The best result was provided when the search system used a database of plural flowers, did narrowing down by size, and extracted a characteristic of the color from the whole flower domain. The result of our experiments shows that the percentage getting the target image in the top ten was 95.1%.
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