------------------------------------------------------------------------------- B O S T O N U N I V E R S I T Y Computer Science Department C O L L O Q U I U M Wednesday January 26, 1994 3:00pm (Tea served at 2:30pm) Seminar Room / MCS 135 ------------------------------------------------------------------------------- PART HIERARCHIES OF THREE DIMENSIONAL OBJECT SHAPE FOR RECOGNITION by Tanya Zlateva Computer Science Department, Metropolitan College, BU Most theories of visual recognition agree that a decomposition into "meaningful" parts and multiple levels of representation are at the heart of the reconition process. However, hierarchical representations have been based on levels of resolutions and typically remained dissociated from the part concept. In this talk I will present a representational hierarchy of part configurations and discuss the relation of the different levels to the recognition of objects and/or of affordances of objects. The representation is based on a surface decomposition according perceptually valid structural constraints, more specifically local and global convexity vs. nonconvexity, and accounts for both surface and volumetric properties. The "naturalness" of the resulting descriptions will be demonstrated on several examples of complex object shape. Formally, the representation can be viewed as topologies on the bounding surface with increasing strength: the weakest being at the object part level and the strongest at the level of the neighborhood of surface points. Host: Professor Azer Bestavros ------------------------------------------------------------------------------- For more information contact Prof. Azer Bestavros -------------------------------------------------------------------------------