computer animation is the important technique in the fields of scientific visualization. The traditional algorithm like particle tracing is frequently applied to show the speed and direction of the vector field clearl...
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computer animation is the important technique in the fields of scientific visualization. The traditional algorithm like particle tracing is frequently applied to show the speed and direction of the vector field clearly. More particles can display more detailed image but needs more computing time. The technique of texture based animation can make full use of the modern display card and accelerates the rendering process effectively. This paper proposes an animation algorithm based on texture advection technique for vector field visualization. First, the texture image is created including the features of the vector field by line integral convolution algorithm. Then the texture coordinates are adjusted to create new image by calculating the next position of the sample points. In the computing process, Hanning window filter is chosen as the kernel periodic function to remove the noises in the input image as the pre-step. The result image can be obtained by repeating the process of computing and blending two images. The experiment results show the approach is reliable and effective.
XP (eXtreme Programming) has become popular for IID (Iteration and Increment Development). It is suitable for small teams, lightweight projects and vague/volatile requirements. However, some challenges are left to dev...
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ISBN:
(纸本)1595933751
XP (eXtreme Programming) has become popular for IID (Iteration and Increment Development). It is suitable for small teams, lightweight projects and vague/volatile requirements. However, some challenges are left to developers when they desire to practise XP. A critical one of them is constructing the release plan and negotiating it with customers. In this paper, we propose a risk-driven method for XP release planning. It has been applied in a case study and the results show the method is feasible and effective. XP practicers can follow it to decide a suitable release plan and control the development process. Copyright 2006 ACM.
This paper presents a blind watermarking method for triangular meshes. Firstly, one local coordinate system is created for each embedding primitive. The the watermark is a readable string. It is encoded into a binary ...
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This paper presents a blind watermarking method for triangular meshes. Firstly, one local coordinate system is created for each embedding primitive. The the watermark is a readable string. It is encoded into a binary sequence. Also bit by bit by modifying the position of vertices' projections in the local coordinate system is embedded. The watermarked model is achieved by calculating the new position of the watermarked vertices from their modified projections. The original mesh is not required in detecting watermarks. The experimental results show the efficiency of the algorithm not only in visual quality but also in robustness against translation, rotation, scaling, cropping and vertex permutation.
Deformation is a powerful tool for shape modeling and computer animation. The research focuses on a new local deformation model based on convolution surfaces. After a user specifies a series of constraints, which cons...
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Deformation is a powerful tool for shape modeling and computer animation. The research focuses on a new local deformation model based on convolution surfaces. After a user specifies a series of constraints, which consist of line segments, arcs and quadratic curves with effective radii and maximum displacements. The deformation model creates a set of convolution surfaces by taking the constraints as the skeletons. Each convolution surface determines a local influence region and a field function associated with the constraint. Compared with the constrained deformation model based on generalized metaballs, the proposed method reduces the bulges emerged from the deformation. Furthermore, the user finely controls the deformation result by adjusting the weight distributions along the one-dimensional convolution skeletons. This deformation model operates on the local space. It is independent of the underlying representation of the object to be deformed. Experimental results show that new deformation model is both efficient and intuitive.
Data Grid is one of the important research subjects in the field of Grid Computing. To get a high efficiency of the system, this paper proposes a set of novel multi-cast algorithms for Data grid, which can achieve sho...
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Owing to the fluent and lightweight nature, sketch-based user interface is becoming increasingly significant in graphical computing. This paper presents a strategy of sketch understanding for electric circuit diagramm...
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Owing to the fluent and lightweight nature, sketch-based user interface is becoming increasingly significant in graphical computing. This paper presents a strategy of sketch understanding for electric circuit diagramming in e-learning. It can be characterized in three aspects. Firstly, the LR grammar modeling technique is adopted to represent drawing contexts and shapes. So that stroke parsing and sketch recognition can be combined. Secondly, error correction based on fuzzy logic reasoning is introduced to deal with errors caused by the ambiguity of recognition. Further provided a guide for stroke parsing based on the context. Significantly, it recognizes drawings recursively without user's explicit mediations. Experiments proved the proposed method is both effective and efficient.
This paper describes a research project to implement vehicle body structure design in early stage of a new vehicle program. In order to dramatically reduce the design mistakes of traditional method in vehicle structur...
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This paper describes a research project to implement vehicle body structure design in early stage of a new vehicle program. In order to dramatically reduce the design mistakes of traditional method in vehicle structure concept design, an intelligent system has been implemented based on UGS NX/API opening platform, which is named CVD (Concept Vehicle body Design) System. In this system, a template method is adopted to build body concept geometry model and FEM model quickly and easily. It also integrates body modeling, analysis and optimization on one CAD platform by the parametric variables database and all of parametric variables would be shared or updated on different phases of the CVD system. A wizard user interface based on knowledge is used in the system, which makes user manipulation easier. The procedures of the implementation and the CVD system function diagram are provided. An example proves the high efficiency of CVD system.
In this paper discussed the design and implementation of a graphical library for synthetic character in virtual learning environment. The library provides basic API for high-level users that do not care about graphic ...
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In this paper discussed the design and implementation of a graphical library for synthetic character in virtual learning environment. The library provides basic API for high-level users that do not care about graphic skills, such as artificial group, educational group programmers. Simply writing several rows of code, the library creates the 3D environment with synthetic characters under user requirements. A virtual mind designed from AI group or imported from present AI system is supported. It controls synthetic character expressing specified behavior and personal personality. Open Scene Graph (OSG) is chosen to manage scene organization and geometry level rendering mechanism based on OpenGL. Behavior is implemented using animation engine which take advantage of Cal3D, an animation library supporting motion blending and transition.
In this paper, a general particle swarm optimization based on SA algorithm (SA-GPSO) for the solution to multi-specification one-dimensional cutting stock problem is proposed. Due to the limitation of its velocity-dis...
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ISBN:
(纸本)1424406048
In this paper, a general particle swarm optimization based on SA algorithm (SA-GPSO) for the solution to multi-specification one-dimensional cutting stock problem is proposed. Due to the limitation of its velocity-displacement search model, particle swarm optimization (PSO) has less application on discrete and combinatorial optimization problems effectively. SA-GPSO is still based on PSO mechanism, but the new updating operator is developed from simulated annealing algorithm, crossover operator and mutation operator of genetic algorithm. In order to repair invalid particle and reduce the searching space, best fit decrease (BFD) is introduced into repairing algorithm of SA-GPSO. According to the experimental results, it is observed that the proposed algorithm is feasible to solve both sufficient one-dimensional cutting problem and insufficient one-dimensional cutting problem
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