Active contour, or snake, is an energy minimizing spline that is useful in image boundary detection. Active contours are stimulated by internal forces, image forces and external forces which maintain the shape of the contours while attract the contours to some desired features, usually edges. Problems in implementing active contours such as convergence and initialization have motivated research...

In this paper we propose a new technique for outlines of objects detection. We exploit the set of contours computed using the image analogies principle. A set of artificial patterns are used to locate contours of any query image, each one permits the location of contours corresponding to a specific intensity variation. We studied these contours and a theoretical foundation is proposed to explai...

Vortex-induced vibrations (VIV) of a cylinder in Newtonian fluid is model problem fluid–structure interactions and has been studied extensively. In this work, we study the influence shear-thinning shear-thickening fluids on VIV response one-degree-of-freedom flexibly-mounted cylinder. We consider system with mass ratio $m^*=2$ zero structural damping power-law at $Re_0 = 15$ 200$ , respectively...

Previous literature suggests that low-level stimulus properties determine the detection performance of contours and are used to define different contour types. Here we investigated the processing of different types of contours under conscious and unconscious conditions. In Experiment 1, we adopted an inattentional blindness paradigm and showed that collinear contours (i.e., a contour type that ...

We explain how to compute correlation functions at zero temperature within the framework of quantum version Separation Variables (SoV) in case a simple model: XXX Heisenberg chain spin 1/2 with twisted (quasi-periodic) boundary conditions. first detail all steps our method anti-periodic The model can be solved SoV by introducing inhomogeneity parameters. action local operators on eigenstates ar...

This paper presents a new method for reconstructing piecewise linear surfaces from planar polygonal contours that branch. For non-branching contours, experience has shown that the piecewise linear surface of minimum surface area which connects a pair of contours often provides a good solution. The current algorithm extends this idea by searching for the surface of minimal area which connects tw...

In this paper we study the exact contours of a piecewise trilinear scalar field. We show how to represent these contours exactly as trimmed surfaces of triangular rational cubic Bézier patches. As part of this, we introduce an extension of the marching cubes algorithm which gives a topologically exact triangular approximation of the contours for any case. Finally, we modify the exact contours t...

In order to recognize plant species from their shapes, shapes of contours of leaves can be used. However, contours of leaves are complicated and have variations. In order to deal with the complexities and variations of contours of leaves, a hierarchical representation of leaves is presented in this paper. First, global structures and shapes of leaves are represented by polygons whose vertices a...

We examined interpolation in 6- and 9-year-old children and in adults, in the two most common forms of fragmentation: subjective and partially occluded contours. Experiment 1 examined the effects on adults' interpolation of contour geometry, specifically, the effect of a scale-dependent factor (i.e., retinal size) and a scale-independent factor (i.e., support ratio). For both subjective and par...

Overlaid plots of iso-contours in individual members of a scalar ensemble field are a popular concept to visualize the data uncertainty. However, such plots do not allow inferring on the spatial cumulative probability distribution of the iso-contours, and they cannot reveal distribution characteristics like spread and topology for very large amounts of contours. In this paper, we propose a new ...