The Average Silhouette Width (ASW) is a popular cluster validation index to estimate the number of clusters. question whether it also suitable as general objective function be optimized for finding clustering addressed. Two algorithms (the standard version OSil and fast FOSil) are proposed, they compared with existing methods in an extensive simulation study covering known unknown numbers Real ...

OBJECTIVE To determine the prevalence of various radiographic findings for dogs with cardiac tamponade (CT) attributable to pericardial effusion (PE) and to determine the sensitivity and specificity of such findings for identification of affected dogs. DESIGN Retrospective, randomized, blinded, controlled study. ANIMALS 50 dogs with CT attributable to PE and 23 control dogs (10 healthy dogs...

G. Elber Dept. of Computer Science, Technion, Haifa, 32000, Israel [email protected] Abstract We present an efficient and robust algorithm for computing the perspective silhouette of the boundary of a general swept volume. We also construct the topology of connected components of the silhouette. At each instant t, a three-dimensional object moving along a trajectory touches the envelope...

Silhouettes have many applications in computer graphics such as non-photorealistic edge rendering, fur rendering, shadow volume creation, and anti-aliasing. The number of edges, s, in the silhouette of a model observed from a point is therefore useful in analyzing such algorithms. This paper examines, from a theoretical viewpoint, a menagerie of objects with interesting silhouettes (including t...

A general-purpose neural model that challenges image understanding is presented in this paper. The model incorporates accumulative computation, lateral interaction and double time scale, and can be considered as biologically plausible. The model uses at global time scale t and in form of accumulative computation all the necessary mechanisms to detect movement from the grey level change at each ...

Many applications in computer vision require the 3D reconstruction of a shape from its different views. When the available information in the images is just a binary mask segmenting the object, the problem is called shape from silhouette (SfS). As first proposed by Baumgart [1], the shape is usually computed as the maximum volume consistent with the given set of silhouettes. This is called visu...

Transparency in 3D graphics has traditionally been created by ordering the transparent objects from back-to-front with respect to the viewpoint, and rendering the opaque objects first and then the transparent objects in the prescribed order. This has three major disadvantages: need for splitting intersecting polygons, repeated ordering for varying view points, and finally, incorrect transparenc...