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Large high-resolution displays have been widely applied in various applications, such as entertainment, scientific visualization, high-fidelity collaborative environments, etc. A popular way to realize such displays is to tile multi-projector together to construct one large size display. In this paper, a low-cost multi- projector seamless tiled display system is constructed using commodity hardware...
The portability and immediate communication properties of mobile devices influence the learning processes in accessing resources and transferring data. The strength of mobile learning is the personalization and mobility; therefore it must support the availability of sensing contextual information about the learner and provide the learning content with mobile metadata. Based on fuzzy Petri nets, a...
Concerns about ubiquitous computing have been raised by the development of IT technology. And available services based on ubiquitous computing are being researched for the realization of U-city as well. U-city that is construction schedule to Pajoo Unjeong is planning `blue network' construction. In `blue network' has a plan to recycle water. This paper proposes service that takes advantage of U-technology...
Human machine interaction, such as virtual reality and 3D interaction, is one of the key technique challenges on the way to achieve ubiquitous computing. In order to realize harmonious human machine interaction, this paper makes some useful efforts on formalizing rational and emotional agents for human machine interface basing on multi-agent technology. An improved model of concurrent game structure...
Adopting the traditional object-oriented and component-based methods, the software architecture design pattern can be applied in the concurrent, realtime and distributed fields, which will replace the kind of strong-coupling and process-oriented development predominant in the real-time embedded software to satisfy the needs of the fast development of hardware and communication technology. Combined...
Normal mapping can reveal the details of complex geometry object and improve the photorealistic when rendering. However, GPU should compress a great number of normal textures to save the valuable video memory and limited bandwidth just as the common texture compression technology. This paper proposes a Hybrid Adaptive Normal Map Texture Compression Algorithm, which utilizes three useful tactics, which...
We present a new scheme for the surface reconstruction of large noisy scattered points coming from laser range scanners. It is based on a combination of the two well-known methods: least square reproducing kernel (LSRK) and partition of unity (PoU). The input point datasets are broken into many subdomains with an error-controlled octree subdivision method, which adapts to variations in the complexity...
2D shape blending or morphing is the process of continuously transforming one polygon into another, which is widely studied in 2D character animation, pattern matching, geometric modeling, virtual reality technologies and simulation, etc. ,and has found significant applications in those fields. Presents a new 2D shape blending algorithm based on the vertex circular arc path.After controlling the vertex...
One extended cell partitioning algorithm is proposed for improving the efficiency of extracting isosurface. A "ring" shape zone is constructed near isosurface. The bound threshold of the zone is determined by the half length of the cell diagonal. The cells inside the zone are processed, and the cells outside the zone are removed. The fast visualization algorithm is applied to the implicit...
A virtual clone fish experimental system is designed and set up. The system simulates the clone fish experiment process using the technique of virtual reality based on behavior model. Through the experiment, users can further observe the results and make conclusion more conveniently and quickly. The virtual clone fish experiment can reduce unnecessary waste caused in a reality clone fish experiment...
In this paper, two single pattern matching algorithms are presented, each of which is composed by a smallest suffix automaton and a forward finite state automaton. Whatever the suffix automaton or the forward finite state automaton is running, the window shifts m-R characters and then the suffix automaton starts running if no pattern prefix is found (R is zero) in the first algorithm or R is not greater...
In geographic space, spatial behaviors of humans are driven directly by their spatial cognition, and indirectly by the physical or geometrical reality. The recognition of cognitive distance is fundamental in human intelligent computation, particularly in commonsense knowledge engineering. The cognitive distance is dialectically used for measuring the similarities between cognized geographic objects...
This paper proposes a kind of general motion model and deterministic algorithm to compute the objects' centers of rotation and 3D motion parameters based on stereo sequences images and validates the algorithm through virtual simulation based on three-COMERO. It is assumed that the establishing correspondence between the matching points has been accomplished. For arbitrary two motion objects, firstly...
In this paper, we present a skeleton-based triangular surface reconstruction method for visualizing plant roots. The proposed method models plant roots as generalized cylinders. A generalized cylinder is constructed by sweeping a two-dimensional cross section along an axis in three-dimensional space. In order to efficiently construct a generalized cylinder, all the cross sections are first generated...
In this paper, we propose a new interacting multiple model (IMM) algorithm combined with particle filter for nonlinear/non-Gaussian systems, which adopts the multirate technique to improve the computational efficiency. The interacting multiple model (IMM) algorithm is specially designed to track accurately targets, and the particle filter is aim to deal with nonlinear/non-Gaussian problems. But the...
In order to test the space docking mechanism on the ground, the docking process of two spacecrafts must be simulated. The hybrid simulation (hardware-in-loop simulation) is a preferred method for its great applicability to different spacecrafts. Therefore, a space docking hybrid simulation (SDHS) prototype system is established. In this system actual spacecrafts are replaced by virtual ones and the...
Shape matching is one of the crucial problems in 3D model retrieval system. A usual approach is to exhaustively search through the database comparing each database model with the query model. This approach is inefficient especially for a large database. In this paper, an efficient mechanism for 3D model retrieval is proposed. In the preprocessing stage, a set of reference models are selected from...
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