Visual Form: Analysis and Recognition

C. Arcelli

L.P. Cordella

G.S. di Baja

This book contains the papers presented at the International Workshop on Visual Fonn, held in Capri (Italy) on May 27-30, 1991. The workshop, sponsored by the International Association for Pattern Recognition (!APR), has been jointly organized by the Dipartimento di Infonnatica e Sisternistica of the University of Naples and the Istituto di Cibemetica of the National Research Council of Italy, and has focussed on Shape. Shape is a distinctive feature of most patterns, so that recognition can often be attained through shape discrimination. The organizers of the workshop shared the general feeling manifested by researchers, that it was time for holding a meeting exclusively devoted to a feature so crucial for both human and machine perception. During this meeting, problems and prospects in the field of 2D and 3D shape analysis could be discussed extensively, so as to provide an effective, updated picture of the current research activity in which shape plays a central role. Indeed, many highly qualified researchers in the field positively reacted to the Call for Papers.

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Cuprins

Thinning of Gray-Scale Images with Combined Sequential and Parallel Conditions for Pixel Removal.- Shape Decomposition Using Structured Light Vision.- Reversible Skeletonization by (5,7,11)-Erosion.- Perception of 3-D Objects by a Robotic Stereo Eye-in-Hand Vision System.- Motion and Structure in Rigid Multi-Surfaced Stationary Environments Using Time-Varying Image Velocity: Linear Solutions.- Parallel Simulated Annealing for Shape Detection.- Filling and Analysing Concavities of Digital Patterns Parallelwise.- Shape from Occluding Contours: a Regularization Method.- Towards Representation of 3D Shape: Global Surface Parametrization.- Differential Invariants of Planar Curves and Recognizing Partially Occluded Shapes.- Three-Dimensional Surface Reconstruction Using Delaunay Triangulation in the Image Plane.- Multidimensional Indexing for Recognizing Visual Shapes.- Circular Shape Detection in Remote Sensing Multispectral Images.- Orthogonal Zig-Zag: an Efficient Method for Extracting Straight Lines from Engineering Drawings.- Massively Parallel Processing of Image Contours.- Classifying Character Shapes.- Detecting Digital Straight Line Segments in O(N2).- Computing Egomotion and Shape from Image Motion Using Collinear Points.- Extraction and Representation of Shape Features for CAD/CAM Applications.- 3-D Object Recognition from Single Perspective Views.- Search and Replace of 2-D Objects in Digital Images.- Primitive-Based Shape Modeling and Recognition.- Qualitative Shape — Some Computational Aspects.- Fast Thinning Algorithms for Large Binary Images.- 3D Object Recognition by Integration of Associative and Symbolic Techniques.- A New Approach to Affine Transform Invariant Shape Matching.- Model-Based Morphology: Simple and Complex Shapes.- Human Face MotionAnalysis.- A Computational Model of Mathematical Morphology.- Determining the Symmetry of Polyhedra.- Depth Data Segmentation Using Robust Estimation in a Hierarchical Data Structure.- Shape Recognition Under Affine Distortions.- Entropy Scale-Space.- A New Contour Generation Thinning Algorithm.- The Visual Hull and Its Computation in 2-D.- Shape Description Using Geons as 3D Primitives.- Shape and Causal-History.- Shape Representation and Recovery Using Deformable Superquadrics.- From Voxels to Curvature Features.- The Dimensions of Shape and Form.- Shape Classification by Using Associative Memories.- Applications of Splines to Shape Description.- 3D Medial Surfaces and 3D Skeletons.- A Review of Hierarchical Representations of Shape and Some Applications.- Estimating Curvature by Kalman Filters.- View-Class Representation and Matching of 3D Objects.- Occlusions and Perspective in an Image Sequence.- Detecting Round Regions.- On Symmetric Forms of Discrete Sets of Points and Digital Curves.- Extraction of Surface Orientation Using Gray Level Difference Statistics.- Shape Splitting from Medial Lines Using the 3–4 Chamfer Distance.- Distance Transformation and Skeleton for Shape Feature Analysis.- Forms Structure Form at Ever “Higher” and “Lower” Levels.- Human Perception of Affine Equivalent Polygons.- 3-D Pose Estimation by an Improved Kohonen-Net.- On the Recognition of Articulated Objects (Generalizing the Generalized Hough Transform).- Analysis of Straight Homogeneous Generalized Cylinders Under Perspective Projection.- Invariants and Pose Determination.- Characteristic Pattern Based on Mathematical Morphology.- Contributors.