USA As Represented by Secretary of the Navy

Lancelot M Riedlinger

Maura C Lohrenz

Marlin L Gendron

Charles B Martin

James A Hammack

Michael E Trenchard

Perry B Wischow

J Michelle Mehaffey

A computer based system and method for determining if a change detection sonar contact in change detection side scan sonar imagery matches a historical contact of the same geospatial location.

Method and system for real-time automated change detection and classification for images

A computer based system and method for real-time display of co-registered historical and current side scan sonar imagery during a side scan sonar survey. Embodiments also include modules for detection of clutter in the current imagery, identification of features, extraction of snippets, filtering based on predetermined size and shape parameters, and determination if a current feature is the same as a previously identified contact from historical imagery.

The moving map composer (MMC) is a device that allows a user to manipulate different sources of map data into a single map for presentation on a display. The MMC has an ability to extract a predetermined area of map coverage defined by sets of latitude and longitude points, or non-orthogonal areas of map coverage, the smallest of which is a segment. A bitmap is a representation of an available map coverage for a given area selected by a user having a &ldquo;set&rdquo;, or &ldquo;1&rdquo; bit to indicate a segment is present, and a &ldquo;clear&rdquo;, or &ldquo;0&rdquo; bit to indicate a segment is missing. The size of the bitmap is determined dynamically to assure a two-bit buffer zone of clear bits around a polygon's maximum extent. If the user selected polygon crosses one or more maps, the polygon is subdivided into several new polygons. Once the total map coverage desired has been defined, what available map sources are determined and the resulting subset is displayed, if the resulting coverage is acceptable, the user may transfer the data to the display.

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Lacombe, LA, United States of America

Lancelot M Riedlinger