This study focuses on various edge detection methods .Edge detection is the common approach used in segmentation. In an image, edge can be the boundary between two regions with relatively distinct grey level properties. Edge detection is the most familiar approach used in medical field, vehicle parking management system etc for segmentation. The aim of this paper is studying different edge dete...

An ideal triangulation of a compact \( 3 \)-manifold with nonempty boundary is known to be minimal if and only the contains minimum number edges among all triangulations manifold. Therefore, every one-edge (i.e., an singular exactly one edge) minimal. Vesnin, Turaev, Fominykh showed that two-edge no \)–\( 2 \) Pachner move can applied. In this paper we show each so-called poor three-edge We exp...

Monique DAUGE and Isabelle GRUAIS Abstract. This paper deals with the asymptotics of the displacement of a thin elastic plate when it is submitted to various boundary conditions on its lateral face: namely, hard and soft clamped conditions, and hard support. Of particular interest is the in uence of the edges of the plate where boundary conditions of di erent types meet. The singular perturbati...

Discrete roughness boundary layer transition results on a Shuttle Orbiter model in the NASA Langley Research Center 20-Inch Mach 6 Air Tunnel have been reanalyzed with new boundary layer calculations to provide consistency for comparison to other published results. The experimental results were previously obtained utilizing the phosphor thermography system to monitor the status of the boundary ...

This paper describes a method for constructing Cartesian meshes for embedded boundary algorithms by using a ray-tracing technique. In this approach, each mesh cell is distinguished as being inside, outside, or on the boundary of the input geometry, which is determined by firing rays parallel to x/y/z coordinates. The most expensive process of the embedded boundary mesh generation, an edge-geome...

Numerical results are presented for the shock-boundary layer interactions in a hypersonic flow over a sharp leading edge compression corner. In this study, a second- order Godunov type scheme based on solving a Generalized Riemann Problem (GRP) at each cell interface is used to solve thin shear layer approximation of laminar Navier-Stokes (N-S) equations. The calculated flow-field shows general...

Let u, v ∈ V be two vertices of a connected graph G. The vertex v is said to be a boundary vertex of u if no neighbor of v is further away from u than v. The boundary of a graph is the set of all its boundary vertices. In this work, we present a number of properties of the boundary of a graph under different points of view: (1) a realization theorem involving different types of boundary vertex ...