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A new method of reconstructing three-dimensional (3D) tubular structures from cone-beam projections is proposed in this paper. Minimal path method is applied to detect 2D tubular structures in the cone-beam projections. The extracted 2D information are fused to design a weight function over the 3D volume so that minimal path method can be applied again to extract centerlines of 3D tubular structures...
A kinds of feature using in content-based 3D model retrieval is ray-based feature. There is much ray/mesh intersection. A fast method combining with space distribution is proposed in this paper, and experiments show the improving effective.
In three-dimensional accurate radiotherapy treatment planning system, one of the key steps in the whole planning is to reconstruct and visualize the surface model of tumor target and organs at risk (OAR) from a serial of cross-sectioned contour points rapidly and accurately. This study designed a fast 3D-reconstruction and visualization pipeline comprising the following four main steps: (1) pre-processing...
This paper proposes to apply the artificial neural network theory and the genetic algorithm to solve the difficulties of predicting composite mechanical properties. Niche technique based on crowding mechanism is used in genetic algorithm, and punishing function is adopted to adjust individual fitness, so as to promote global search capability. Taking the wheat straw-reinforced composite for instance,...
A virtual experiment system for metal creep performance testing is built by virtual reality modeling language (VRML). The structure, function and design principles of the system are described and its implementation procedure is also discussed. The key development process, including object modeling, 3D scene building, VRML connecting to the real-time database, design of interactive virtual 3D scene...
A virtual lab system for material mechanical performance testing is developed by virtual reality modeling language (VRML). The structure, function and design principles of the system are described and its implementation procedure is also discussed. Taking the tensile test for example, the authors provide a feasible solution to realize a platform of complex interactive actions by Visual Basic 2005...
Motion Capture has been widely used in many fields such as animation and game production. This paper describes the scheme and implementation of a self-designed vision-based motion capture system. This system is set up based on a Client/Server network structure. The client software tracks every marker attached to the actor's body and sends the results to the server in real-time. The server software...
The engineering design of antenna arrays requires the knowledge of the mutual coupling within and/or between antenna arrays, which is typically obtained by expensive and time-consuming measurements due to the limited capability of computational methods. Therefore, an efficient numerical method is highly desirable for such problems to speed up the design process, reduce the cost, and expand the optimization...
This paper presented a simple approach to implementing the 2nd-order absorbing boundary condition (ABC) in the FETI-DPEM (dual primal finite element tearing and interconnecting method) without changing the major framework of the method. As a result, the accuracy of the FETI-DPEM method in 3D open-region analysis is significantly improved. Numerical results are provided to validate the implementation...
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