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In this paper, we propose a 3D middleware between the 3D application layer and the transport layer for the transmission of triangle-based progressively compressed 3D models. The significant features of the proposed middleware include. 1) handing 3D models with the algorithm of progressive geometry compression based on wavelet transformation, and the compressed bitstream structure is rate scalability...
In unwrapping interferograms with large size and dense residues, the path-following algorithm as a fundamental unwrapping method may produce retrieval error caused by long branch-cuts and repetitive connection of residues. In this paper, two unwrapping algorithms, i.e. the multiple patches method connecting opposite residues and the center expansion method searching opposite residues, are alternatively...
Virtual-teaching scene is developed and three-dimensional digital systems on Jiangxi Science and Technology Normal University is built mainly based on Virtools, which implements roaming the campus on the computer and reproduction of teaching-scene. The learner can travel every corner of the campus and into the multimedia projector teaching simulation and display system through it. The learner can...
With the demand of real time rendering of large scale of filed scenes, which require the graphic's processing unit that have the features of high efficiency and low power. the rasterization of graphics is a stage of compute intensive and is a key part to raise the system performance. In this paper, I improve the “CENTROL LINE” rasterization, is the main method for designing VLSI, and focus on the...
This paper proposes an embedded surveillance system for real-time anomaly intrusion detection based on temporal difference algorithm and theft items detection based on accumulated background subtraction algorithm. This design of modified vision algorithm fully utilize the advanced parallelism of Field Programmable Gate Arrays (FPGA) and this hardware implementation realizes time-consumed difference...
We investigate feature selection methods, which have been applied to automatic kinds of compressed audio classification systems. It is based on attribute dependency for feature optimization and modified SVM (Support Vector Machine) for classifier. In this paper, we present a new method for feature selection based on priori knowledge by removing both irrelevant and redundant features, and it still...
Dredging simulation is of great significance to the development of dredging engineering technology of harbor, waterway, rivers, lakes, etc. The design and implement of the dredging simulation system are introduced. The modeling and key techniques for the virtual reality of construction site, the movement of dredge vessel, the soil cutting of cutter, and the hydraulic transport of sand in a pipeline,...
Aiming at the massive data organization and management of textures with various sizes for real-time rendering of large-scale 3D city models, this paper proposes a new method: a texture spatial index tree is built up based on the hierarchical spatial index of 3D geometries, and then the texture data is written into mapping files structure through depth-first and hierarchical iteration for the clustering...
A suture simulation system is developed. Using a Phantom desktop haptic device, user can insert a virtual needle into a deformable object and pull a virtual suture attached to the needle through the object. The object can deform under the interaction of both the needle and the suture. The suture uses rigid link model and FTL(Follow the Leader) deformation algorithm. Tensor-mass deformation method...
Proposed and implemented a rapid star map simulation method based on GPU. The method used the vertex shaders of OpenGL shading language to perform real-time calculation of star positions. Combined with the display list technology, the results of calculation were used to perform the simulation of the initial star maps, then the initial star maps as texture were passed to the fragment shaders, completed...
In this paper, dynamic algorithm transforms (DAT) for reconfigurable real-time processor for audio application based on the adaptive wavelet packet (WP) decomposition are presented. DA T techniques is to constrain a minimum cost sub-band decomposition of wavelet transform by maximinimizing the minimum masking threshold (which is limited by the perceptual entropy) in every sub-band for the given embedded...
In this paper, the mainly used packet scheduling algorithms in wireless communication system will be introduced. The 3rd Generation partnership long term evolution (3GPP LTE) will provide QoS guaranteed multimedia services which demand much higher downlink packet rate and lower HOL packet delay. So, a suitable packet scheduling algorithm is becoming more and more important in 3GPP LTE system. The...
In the working environment of argument reality, users interact with virtual objects by hands. Making real-time collision detection between virtual and real objects is very essential to enhance the immersion and authenticity of the environment. In this paper, the key points of hand are marked by color block. We use a pair of common web cameras to collect images and track the points. Then the stereo...
Stereo vision is an important branch of the research area in computer vision. Among the techniques of stereo vision, binocular stereo vision which is based on processing two images remains a research hotspot. Binocular stereo vision directly simulates the manner of human eyes observing one scene from two different viewpoints. By using the principle of triangulation, the disparities of a number of...
In this paper, we propose a novel discrete variational scheme for 3D surface modeling. The key idea is to consider to utilize an unknown surface from a finite number of normals for surface reconstruction. The algorithm, based on active contours procedure, is obtained without any preprocessing or postprocessing steps and with no restriction on the sets of measurement directions except their number,...
Directional difference filter (DDF) is a nonlinear filter for reducing impulse noise. It does not employ order statistics unlike median filter and can reduce impulse noise effectively. However, it has some parameters and we need to set them appropriately based on empirical control. So far, there are few studies to evaluate the appropriateness of the parameter setting of DDF. Parameter setting problem...
According to the concept and characteristics of virtual assembly feature, reconstruction method of virtual assembly feature model is proposed. Using the secondary development tools provided by ProEngineer, namely, ToolKit, getting assembly information is implemented. Based on analysis about three kinds mapping methods between the geometric elements and triangulated patches, an complete information...
In recent years, virtual assembly has become an effective technique for large equipment's maintainability analysis and verification. As an indispensable part in maintenance process simulation, motion control for virtual human still remains on low level based on key-frame or inverse kinematics, which in turn leads to an over complicated modeling process. Therefore, we propose an instruction-level motion...
In this paper, we propose an efficient approach to automatic human object segmentation. First, foreground (human object) model and background model are built based on the face detection result, and are used to obtain the seed pixels for foreground and background, respectively. Then seed pixels are clustered using K-means algorithm, and Gaussian mixture models are exploited to generate the foreground/background...
This paper proposes an embedded vision system for real-time moving object tracking using modified mean-shift algorithm for mobile robot application. This design of modified mean-shift algorithm fully utilizing the advanced parallelism of Field Programmable Gate Arrays (FPGA) is capable of processing real-time PAL video of 720*576 at 25 fps. This hardware implementation realizes time-consumed color...
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