Retrieving images by content and forming visual queries are important functionality of an image database system. Using textual descriptions to specify queries on image content is another important component of content-based search. The authors describe a medical image database system MIQS which supports visual queries such as query by example and query by sketch. In addition, it supports textual queries on spatial relationships between the objects of an image. MIQS is designed as a client-server application in which the client accesses the database and its images via the WWW.
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