Characterizing objects by their shape is a critical part in many computer vision applications. Several theoretically interesting approaches exist which, however, remain computationally too expensive. The goal of this paper is to emphasize the value of primitive shape descriptors. A set of simple descriptors is used as a feature vector in order to group similar objects together. Each descriptor ...

Content based 3D shape retrieval for broad domains like the World Wide Web has recently gained considerable attention in Computer Graphics community. One of the main challenges in this context is the mapping of 3D objects into compact canonical representations referred to as descriptors or feature vector, which serve as search keys during the retrieval process. The descriptors should have certa...

-This paper concentrates on the fold number detection problem for the shapes with monotonic radii. The proposed method is extremely simple. Two monotonicity conditions are derived to ensure that the smallest positive integer I making SStr.o~sr2elt°dr dO nonzero is exactly the fold number of the given shape S. The fold numbers of regular polygons, roses, bolt nuts, and other kinds of shapes disc...

We present a method for deriving shape space parameters that are consistent with immunological data, and illustrate the method by deriving shape space parameters for a model of cross-reactive memory. Cross-reactive memory responses occur when the immune system is primed by one strain of a pathogen and challenged with a related, but different, strain. Much of the nature of a cross-reactive respo...

The relationship between inflation and relative price variability (RPV) is widely believed to be positive and stable. Using disaggregated CPI data for the U.S. and Japan, however, this study finds that the relationship is neither linear nor stable over time. The overall relationship is approximately U-shaped and symmetric around a certain threshold: a positive correlation on one side but a trad...

Virtual claying techniques aim at interactive local and/or global deformation of virtual models by virtual tools. Various implementations of virtual clay models are known. The deformation computation for concrete implementations of virtual claying can be both geometry-based and physically-based. Geometry-based deformation manipulates the shape of the model by modifying geometric parameters (e.g...

With recent improvements in methods for the acquisition and rendering of shapes, the need for retrieval of shapes from large repositories of shapes has gained prominence. A variety of methods have been proposed that enable the efficient querying of shape repositories for a desired shape or image. Many of these methods use a sample shape as a query and attempt to retrieve shapes from the databas...

Approximation is one of the key techniques used in manipulating geometric objects. Aggregation is a form of approximation that joins objects that are likely to be grouped together as a single unit. This can improve efficiency, reduce complexity and generate levels of detail, and has application in rendering, cartography and molecular structure design. In this work, we present a general framewor...

UNLABELLED PREMISE OF THE STUDY I present a protocol for creating geometric leaf shape metrics to facilitate widespread application of geometric morphometric methods to leaf shape measurement. • METHODS AND RESULTS To quantify circularity, I created a novel shape metric in the form of the vector between a circle and a line, termed geometric circularity. Using leaves from 17 fern taxa, I pe...

This paper provides a review of shape analysis methods. Shape analysis methods play an important role in systems for object recognition, matching, registration, and analysis. Research in shape analysis has been motivated, in part, by studies of human visual form perception systems. Several theories of visual form perception are brie y mentioned. Shape analysis methods are classi ed into several...