The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We study the watermarking of 2D vector data and introduce a framework which preserves topological properties of the input. Our framework is based on so-called maximum perturbation regions (MPR) of the input vertices, which is a concept similar to the just-noticeable-difference constraint. The MPRs are computed by means of the Voronoi diagram of the input and allow us to avoid (self-)intersections...
Through study the geometric meaning of Vector Algebra, vector cross-product was used to determine the topological relationship between point and polygon. A horizontal vector was made based on the point determined. Cross multiplication between it and each edge of the polygon was made. Then, the signal of k-component was employed to determine the spatial relationship between point and polygon. An appropriate...
Research on existing vector representation method of the text data and it is advantages or disadvantages and applicability of linear and nonlinear dimensionality reduction methods, the paper analysis the feature of laws and regulations of construction data, establishes the vector space model of the text data. Based on Riemann Surface Theory and Topology Theory, adopting the globe pole mapping method...
It is a critical technique in GIS about how to implement map overlay with high performance. To avoid the disadvantages of computational geometry algorithm approach, an optimal algorithm based on rasterization is proposed in this paper, which adopts approach of rasterization of vector polygons with run length encoded scan line, map overlay on the basis of raster representation and vectorization of...
A new technique for the reconstruction of a smooth surface from a set of 3D data points is presented. The reconstructed surface is represented by an everywhere C1-continuous subdivision surface which interpolates all the given data points. The new technique consists of two major steps. First, an efficient surface reconstruction method is applied to produce a polyhedral approximation to the given data...
Design and control of vector fields is critical for many visualization and graphics tasks such as vector field visualization, fluid simulation, and texture synthesis. The fundamental qualitative structures associated with vector fields are fixed points, periodic orbits, and separatrices. In this paper, we provide a new technique that allows for the systematic creation and cancellation of fixed points...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.