Accession Number : ADA296353
Title : Multiple Representation Approach To Geometric Model Construction from Range Data.
Descriptive Note : Technical rept.,
Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA DEPT OF COMPUTER AND INFORMATION SCIENCE
Personal Author(s) : Koivunen, Visa ; Vezien, Jean-Marc ; Bajcsy, Ruzena
PDF Url : ADA296353
Report Date : 1995
Pagination or Media Count : 27
Abstract : A method is presented for constructing geometric design data from noisy 3-D sensor measurements of physical parts. In early processing phase, RLTS regression filters stemming from robust estimation theory are used for separating the desired part of the signal in contaminated sensor data from undesired part. Strategies for producing a complete 3-D data set from partial views are studied. Surface triangulation, NURBS, and superellipsoids are employed in model construction to be able to represent efficiently polygonal shapes, free form surfaces and standard primitive solids. Multiple representations are used because there is no single representation that would be most appropriate in all situations. The size of the required control point mesh for spline description is estimated using a surface characterization process. Surfaces of arbitrary topology are modeled using triangulation and trimmed NURBS. A user given tolerance value is driving refinement of the obtained surface model. The resulting model description is a procedural CAD model which can convey structural information in addition to low level geometric primitives. The model is translated to IGES standard product data exchange format to enable data sharing with other processes in concurrent engineering environment. Preliminary results on view registration and integration using simulated data are shown. Examples of model construction using both real and simulated data are also given. (AN)
Descriptors : *IMAGE PROCESSING, *OPTICAL IMAGES, DATA BASES, MATHEMATICAL MODELS, ALGORITHMS, SIGNAL PROCESSING, COMPUTERIZED SIMULATION, AUTOMATION, DATA MANAGEMENT, COMPUTER AIDED DESIGN, SHAPE, SIGNAL TO NOISE RATIO, CONCURRENT ENGINEERING, MESH, ESTIMATES, REGRESSION ANALYSIS, THREE DIMENSIONAL, GEOMETRIC FORMS, DATA ACQUISITION, COMPUTER VISION, OPTICAL DETECTORS, IMAGE REGISTRATION, IMAGE RESTORATION, SPLINES(GEOMETRY), POLYGONS, TRIANGULATION.
Subject Categories : Cybernetics
Distribution Statement : APPROVED FOR PUBLIC RELEASE