Abstract
Most conventional image retrieval systems use the title and keywords added to image. In an image retrieval system Feelimage developed by us, we use color distributions and exif information such as date and time, where we retrieve them with fuzzy sets. All fuzzy sets in our system are fixed, but fuzzy sets, for example, "evening" in our life are not fixed. This is the reason why the sunset time varies every day. In other words the "evening" is defined by the attribute "date". In this paper, the fuzzy set "evening" is defined by the sunset time calculated from a date and a place. In addition, we define various time zones such as "morning" and "midnight" as fuzzy sets by the sunrise and sunset times. A retrieval experiment in 102 landscape images shows the improvement of the quality of the retrieval.
