An interface, adapted for receiving information composed of symbols, characters, and diagrams representing a spatial positional relationship and used as a retrieval request, comprises an entry device for entering a two-dimensional image, and a retrieval request interpreting device for recognizing elements...http://www.google.com/patents/US5148522?utm_source=gb-gplus-sharePatent US5148522 - Information retrieval apparatus and interface for retrieval of mapping information utilizing hand-drawn retrieval requests
Information retrieval apparatus and interface for retrieval of mapping ...
