Active contour is an effective technique for object boundary extraction in biomedical images such as blood vessel tracing or optic disc extraction in retinal images. The traditional serial realization of contour finding needs considerable processing time. This paper presents a parallel realization of the active contour model to speed up the contour convergence process. The initially drawn conto...

Contour crossings are a form of numerical error common to contour dynamical and contour-advective simulations of geophysical fluid flows. This thesis is devoted to the study of contour crossings that occur in simulations of fluid motion performed by the Contour-Advective Semi-Lagrangian (CASL) algorithm. Components of the CASL algorithm relevant to the study of contour crossings are discussed. ...

Active contour methods can be used to segment a 3D mesh into parts by iteratively moving the contour to the mesh region that minimizes the contour energy. However, as the contour moves, it often does not lie on the mesh surface. To address this problem, existing methods use either vertex/edge projection or mesh parameterization to obtain the corresponding contour on the mesh surface. Although v...

This paper presents a prosody generation method for Chinese mandarin using the template of quantified prosodic unit and base intonation contour. This method uses the prosodic feature picked-up from the syllables in the prosody words by rule as the base unit, and integrates the prosody rules in the prosody words of Chinese mandarin and base intonation contour to achieve the prosody contours with...

This paper introduced a method of building and fixing a digitalized model of human hand gesture through contour analysis of the hand’s orthographic projection. Via contour analysis the fingers and palm on the projection are located and their quantized characters are calculated. The model is used in a gesture recognition method, where the articulation is of core concern. Thus the method is adapt...

Mass lesion segmentation on mammograms is a challenging task since mass lesions are usually embedded and hidden in varying densities of parenchymal tissue structures. In this article, we present a method for automatic delineation of lesion boundaries on digital mammograms. This method utilizes a geometric active contour model that minimizes an energy function based on the homogeneities inside a...

There has been much recent interest in curvature-dependent contour evolution, particularly when the resultant family of contours satisfies the heat (diffusion) equation. Modeling the evolution of a shape's boundary as a real-valued solution to the reaction-diffusion equation has been shown to be useful for shape decomposition [3]. This approach to contour evolution involves solving a partial di...

A contour tree is a good graphical tool for representing the spatial relations of contour lines and has found many applications in map generalization, map annotation, terrain analysis, etc. A new approach for generating contour trees by introducing a Voronoi-based interior adjacency set concept is proposed in this paper. The immediate interior adjacency set is employed to identify all of the ch...