In a DB retrieval method, a two-step retrieval including quantitative and qualitative retrievals is interactively performed so that, through the operation of image information (e.g. map information) having a correspondence to a DB having text information such as attribute information stored therein,...http://www.google.de/patents/US6144956?utm_source=gb-gplus-sharePatent US6144956 - Methods for retrieving text information in a database through image information and a program stored on a computer-readable storage medium for performing such a method
