Patent ID: 8036678

Claim:
An information system for dynamic distribution of location-related information between users with different perspective views, the system comprising a plurality of user units, each user unit including: (a) a viewing arrangement defining a viewing direction of a current perspective view; (b) an image sensor deployed in fixed spatial relation to said viewing arrangement; (c) a registration subsystem for deriving a mapping between the current perspective view and a shared location reference; (d) a data management system including a processor and a storage device, said data management system storing location-related information associated with coordinates within said shared location reference and employing said mapping to transform between said coordinates within said shared location reference and a corresponding viewed location within the current perspective view; and (e) a wireless communication arrangement for sharing between said plurality of user units location-related information and corresponding coordinates, wherein at least a first of said user units further includes a user input interface for designating a viewed location within the current perspective view a viewed location for association with location-related information, thereby generating a new location-related information entry for sharing with others of said: plurality of user units, and wherein at least a second of said user units further includes a display device associated with said viewing arrangement for displaying location-related information correctly positioned in the context of the current perspective view, and wherein said shared location reference includes at least one location reference image, said registration subsystem being configured to correlate images from said image sensor with said location reference image to determine a registration mapping between images from said image sensor and said, shared location reference, said correlating including correlating said image with an intermediate reference image so as to generate a first mapping transformation and correlating said intermediate reference image with said location reference image so as to generate a second mapping transformation, said registration mapping being employed to derive coordinates of the designated location within said shared location reference for transmission from said first user via said wireless communication arrangement.