Silhouettes are building elements of logos, graphic symbols and fonts. These shapes can be designed exchanged in vector form, but more often they drawn, printed, scanned, or directly found digital images. Such raster forms require vectorization to get scale-invariant exchangeable formats. There is a need for mathematically well-defined justified shape process, which also provides minimal set co...

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 ...

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...

one of the most important goals of orthodontic treatment is to create an esthetic, well balanced facial profile. however, the components of a well-balanced iranian facial profile have not yet been established. the purpose of this study was to evaluate the anteroposterior lip position of the iranian population and to compare the perception of orthodontists, dental students and orthodontic patien...

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 ...