Robust Software Watermarking for Protecting Three Dimension Applications Developed Using jMonkey Engine

2012 ◽  
Vol 268-270 ◽  
pp. 1873-1876
Author(s):  
Dong Lai Fu
Keyword(s):  
New Method ◽  
Three Dimension ◽  
Numbering System ◽  
Scene Graph ◽  
Graph Traversal ◽  
Initial Sequence ◽  
Important Clue ◽  
Software Watermarking

To prevent three dimension applications developed using jMonkey Engine from being pirated, a robust software watermarking algorithm was proposed. A watermark based on an initial sequence of scene-graph-traversal was embedded into the software by a numbering system. Since the initial sequence was a very important clue for extracting the embedded watermark, it should be only known by the owner. Furthermore, the algorithm for embedding and extracting the watermark was discussed. Analysis shows that the new method is more robust. And it enjoys the advantage that the size of scene graph does not be changed.

Research on Construction of Semantic Web of 3D Model Database

2012 ◽  
Vol 532-533 ◽  
pp. 1263-1267
Author(s):  
Hui Jia ◽  
Guo Hua Geng ◽  
Jin Xia Yang
Keyword(s):  
Semantic Web ◽  
3D Model ◽  
3D Model Retrieval ◽  
New Method ◽  
Three Dimension ◽  
Semantic Extension ◽  
Model Retrieval ◽  
Semantic Relevance ◽  
Model Database

This paper presented a new method to construct semantic web of three-dimension model database based on ontology. Firstly we build ontology of three-dimension model database, according the model to extract classes, objects and attributes. Secondly utilize WordNet which is an English ontology to expand original ontology node to semantic extension node, including synonym, hypernym, hyponym and holonym. Experiment result shows that this method not only effectively expands the semantic vocabularies of a 3D model database, but also keeps good semantic relevance of the expanded vocabularies to the original ones, so as to achieve semantic based 3D model retrieval effectively.

Study on Setting the Initial Nodal Temperature on the Joint Face of Concrete Dam

2011 ◽  
Vol 94-96 ◽  
pp. 1596-1600
Author(s):  
You Ping Zhu ◽  
Shou Kai Chen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Field ◽  
Good Accuracy ◽  
New Method ◽  
Three Dimension ◽  
Concrete Dam ◽  
Field Simulation ◽  
Element Method

Because of lacking a rigid method of setting the initial nodal temperature on the joint face, the accuracy of temperature simulation would be affected in concrete dam. Based on finite element method (FEM) and principle of thermal conversation, we validate and extend a new method of setting the initial nodal temperature on the joint face in this paper. The result of temperature field simulation shows that this method has good accuracy in three-dimension temperature field simulation.

Hybrid Modeling Based on Multiple Range Image

2013 ◽  
Vol 325-326 ◽  
pp. 1796-1799
Author(s):  
Ning Jun Ruan ◽  
Peng Wu ◽  
Kai Xie
Keyword(s):  
Hybrid Modeling ◽  
New Method ◽  
Range Image ◽  
Three Dimension ◽  
Complicated Shape ◽  
Correct Position ◽  
Object A ◽  
Realistic Image ◽  
Dimension Space

In order to reconstruct three dimension model of an object, a new method of hybrid modeling is presented. This method use multiple range image of different viewpoint, according to the color and texture, the pixel point can be mapped to correct position in three dimension space by the back-project transformation. Then the image can be got in any viewpoint by modeling reconstruction and reprojection. Experiments have proved that this method has excellent features, especially in high realistic image and static complexities. So, it can be used to reconstruct some objects with complicated shape and topologies.

How to Get the Solar Direction from Skylight Polarization for Satellite Autonomous Navigation

2014 ◽  
Vol 577 ◽  
pp. 434-437
Author(s):  
He Huang ◽  
Jun Zhou ◽  
Ying Ying Liu
Keyword(s):  
Autonomous Navigation ◽  
Satellite Navigation ◽  
New Method ◽  
Vector Polarization ◽  
Important Clue ◽  
Skylight Polarization ◽  
Polarization Sensor

The solar direction is an important clue for satellite autonomous navigation. A new method for obtaining the solar direction from skylight polarization for satellite navigation is discussed. The new method is using two E-vector polarization sensors to get solar direction, and the view field of the polarization sensor is discussed.

Scene Graph Based Multi-Thread Rendering System

2011 ◽  
Vol 268-270 ◽  
pp. 1548-1552
Author(s):  
Fang Wan ◽  
Fei Deng
Keyword(s):  
Data Structure ◽  
High Performance ◽  
Three Dimensional ◽  
Dimensional System ◽  
Data Organization ◽  
Three Dimension ◽  
Scene Graph ◽  
Organization And Management ◽  
Huge Data ◽  
System Data

Traditional three dimensional system data structure such as tree and linked list does not fit the huge data organization and management. In this paper, we introduced advantage of scene graph data structure in three dimension data management and presented a scene graph based data structure to improve the management and rendering efficiency. To assure high performance in a usual PC machine, we designed a multi-thread structure to respectively handing data reading, merging and rendering. From the experiment, we proved the capability of the multi-thread rendering system in different level of data size.

scholarly journals Environmental Perception and Sensor Data Fusion for Unmanned Ground Vehicle

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Yibing Zhao ◽  
Jining Li ◽  
Linhui Li ◽  
Mingheng Zhang ◽  
Lie Guo
Keyword(s):  
Data Fusion ◽  
Object Identification ◽  
New Method ◽  
Three Dimension ◽  
Chain Code ◽  
Probability Assignment ◽  
Basic Probability Assignment ◽  
Basic Probability ◽  
Cross Country ◽  
Theory Of Evidence

Unmanned Ground Vehicles (UGVs) that can drive autonomously in cross-country environment have received a good deal of attention in recent years. They must have the ability to determine whether the current terrain is traversable or not by using onboard sensors. This paper explores new methods related to environment perception based on computer image processing, pattern recognition, multisensors data fusion, and multidisciplinary theory. Kalman filter is used for low-level fusion of physical level, thus using the D-S evidence theory for high-level data fusion. Probability Test and Gaussian Mixture Model are proposed to obtain the traversable region in the forward-facing camera view for UGV. One feature set including color and texture information is extracted from areas of interest and combined with a classifier approach to resolve two types of terrain (traversable or not). Also, three-dimension data are employed; the feature set contains components such as distance contrast of three-dimension data, edge chain-code curvature of camera image, and covariance matrix based on the principal component method. This paper puts forward one new method that is suitable for distributing basic probability assignment (BPA), based on which D-S theory of evidence is employed to integrate sensors information and recognize the obstacle. The subordination obtained by using the fuzzy interpolation is applied to calculate the basic probability assignment. It is supposed that the subordination is equal to correlation coefficient in the formula. More accurate results of object identification are achieved by using the D-S theory of evidence. Control on motion behavior or autonomous navigation for UGV is based on the method, which is necessary for UGV high speed driving in cross-country environment. The experiment results have demonstrated the viability of the new method.

Application of a Virtual Geosciences Modeling System in Digital City Construction

2010 ◽  
Vol 20-23 ◽  
pp. 1311-1314 ◽  
Author(s):  
Chun Hua Dong ◽  
Jian Ping Hu ◽  
Li Wang
Keyword(s):  
Service Systems ◽  
New Method ◽  
Three Dimension ◽  
Geological Environment ◽  
Digital City ◽  
Spatial Query ◽  
Virtual Reality Technology ◽  
Digital Map ◽  
Geological Information ◽  
City Construction

This document puts forward a new method for solving the modeling of overground and underground entities and spatial analysis provided by the virtual reality technology (VR). The new method can construct virtual urban geological environment, realize the integrated modeling of overground and underground entities, and research the interactive functions such as 2D-digital map navigation and spatial query in the virtual environment, which provides the decision making platform of three-dimension visualization for urban planning, urban construction and urban management, and is a good foundation for construction of “the management and service systems for urban geological information”.

A new method for quantitative analysis of EELS

1994 ◽  
Vol 52 ◽  
pp. 950-951
Author(s):  
Suichu Luo ◽  
David C. Joy
Keyword(s):  
Quantitative Analysis ◽  
Energy Loss ◽  
Single Scattering ◽  
New Method ◽  
Three Dimension ◽  
Angular Correction ◽  
Accurate Quantitative Analysis ◽  
Angular Scattering ◽  
Electron Intensity ◽  
Image Position

Techniques to remove plural scattering from electron energy loss spectra (EELS) are important in bot hmicroanalysis and other quantitative applications of electron spectroscopy. The techniques used are either based on convolution, or Fourier transform deconvolution, methods, in which either the elastic scattering angular correction or both elastic and inelastic angular corrections are not included. In this work we propose a new method based on both angular and energy loss three-dimension Poisson statistics which includes elastic and inelastic mixed angular scattering correction in order to obtain more accurate quantitative analysis for EELS.The electron scattering distribution determined by angular and energy loss three-dimension Poissonstatistics is given by:where IT is the total incident electron intensity; t is the sample thickness; λi, λe and λT are inelastic , elastic and total scattering mean free paths; Si (θ) and Se(θ) are normalized single inelastic and elastic angular scattering distributions respectively, F(E) is the single scattering normalized energy loss distribution.

Selective Sampling and Orientation of Non-Homogeneous Tissues

1968 ◽  
Vol 26 ◽  
pp. 98-99
Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Light Microscopy ◽  
Random Sampling ◽  
New Method ◽  
Microscope Examination ◽  
Small Areas ◽  
Selective Sampling ◽  
Large Numbers ◽  
Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

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