In this work we present an extension of the regression-based method presented in [27] for centerline and boundary detection. As shown in [27], classification based approaches are inaccurate when applied to centerline detection of linear structures. The reason is that centerline points and locations immediately next to them are extremely difficult to distinguish, The solution proposed in [27] is...

The theory of turbulent jets emerging from a circular hole can be found in different books which adopt different theories (1; 2; 3; 4) or in specialized articles (5; 6) : in all the models the pressure , p, is equal to zero. The centerline velocity is always taken to be classical. This paper briefly reviews in Section 2 the simplest model of turbulent jets and then investigates in Section 3 the...

Abstract: Within the American Society for Testing and Materials (ASTM) a Standard Practice (Z6849Z ) is being developed to provide an objective statistical procedure for comparing air quality simulation modeling results with tracer field data. The practice is limited to steady-state local-scale transport from isolated point sources in simple terrain. Evaluation data having similar external cond...

Seamline network generation is a crucial step in mosaicking multiple orthoimages. It determines the topological and mosaic contribution area for each orthoimage. Previous methods, such as Voronoi-based AVOD (area Voronoi)-based, may generate holes low-overlap irregular orthoimage cases. This paper proposes Voronoi centerline-based seamline method to address this problem. The first detect edge v...

CT colonography is an emerging technique for colorectal cancer screening. Using this technique virtual reality models of the human colon are generated from an abdominal CT study of a suitably prepared patient. Manual navigation through these models is a slow and tedious process. It is possible to automate navigation by calculating the centerline of the human colon. There are numerous well docum...

Semianalytical solutions are developed for turbulent hydrogen-air plume. We derived analytical expressions for plume centerline variables radius, velocity, and density deficit in terms of a single universal function, called plume function. By combining the obtained analytical expressions of centerline variables with empirical Gaussian expressions of the mean variables, we obtain semianalytical ...

Rural two-lane roads generally lack physical measures such as wide medians or barriers to separate opposing traffic flows. As a result, a major crash problem on these roads involves vehicles crossing the centerline and either sideswiping or striking the front ends of opposing vehicles. These types of opposing-direction crashes account for about 20% all fatal crashes on rural two-lane roads and ...

Accurate determination of the vessel axis is a prerequisite for automated visualization and quantification of artery diseases. This paper presents an evaluation of different methods for approximating the centerline of the vessel in a phantom simulating the peripheral arteries. Six algorithms were used to determine the centerline of a synthetic peripheral arterial vessel. They are based on: ray ...