In the paper we present a method for area and volume approximation using modifications to the marching cubes algorithm of Lorensen and Cline (1987). Approximations to two and three-dimensional objects using marching s...
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In the paper we present a method for area and volume approximation using modifications to the marching cubes algorithm of Lorensen and Cline (1987). Approximations to two and three-dimensional objects using marching squares and marching cubes have been covered extensively. Given an approximation to an object, an algorithm is presented which allows a simple method that can approximate the area or volume of the object. More interestingly the method can be used to estimate the area encapsulated between two points on the surface and a line or the volume encapsulated between three points on the surface and a plane. This is of use in room and space planning operations or the design of rooms and manufactured products.
We propose a new method for matching two 3D point sets of identical cardinality with global similarity but locally nonrigid distribution. This problem arises from marker-based optical motion capture systems. The point...
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We propose a new method for matching two 3D point sets of identical cardinality with global similarity but locally nonrigid distribution. This problem arises from marker-based optical motion capture systems. The point-sets are extracted from similar design poses of two subjects with underlying nonrigidity and possible distribution discrepancies, one being a model set (manually identified) and the other representing observation of another subject, to be matched to the model set. There exists neither a single global scale, nor an affine transformation between the point-sets. To establish the goal of a one-to-one for identification, we introduce a k-dimensional tree based method, which is well adapted and robust to such data, typically with distribution errors due to underlying subject nonrigidity. First, we construct a k-d tree for the model set. Then a similarity k-d tree of the data set is constructed following the structure information embedded in the model tree. Matching sequences of the two point sets are generated by traversing the identically structured trees. Experimental results confirm that this method is applicable for robust spatial matching of sparse point sets under nonrigid distortion.
Follow the advances in computing technologies from teraflop to petaflop (hardware, software, and algorithms) to : . Perform realistic simulations of nanosystems and devices . Demonstrate the feasibility of simulating ...
ISBN:
(数字)9783540362654
ISBN:
(纸本)3540003037
Follow the advances in computing technologies from teraflop to petaflop (hardware, software, and algorithms) to : . Perform realistic simulations of nanosystems and devices . Demonstrate the feasibility of simulating systems not yet attempted . Incorporate simulation and parallel computing & visualization in physical sciences and engineering education
We introduce the Bioelectric Problem Solving Environment (BioPSE), and demonstrate its utility in solving forward and inverse bioelectric field problems. BioPSE is an extensible software toolkit of modeling, simulatio...
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We introduce the Bioelectric Problem Solving Environment (BioPSE), and demonstrate its utility in solving forward and inverse bioelectric field problems. BioPSE is an extensible software toolkit of modeling, simulation, and visualization tools that have been tightly integrated into a unified, interactive software environment. BioPSE has been developed through the NIH NCRR Center for Bioelectric Field Modeling, Simulation, and visualization; the software is open source, and is freely available for non-commercial use. To introduce BioPSE we provide a brief overview of the design of the system and then demonstrate the utility of BioPSE by using it to solve a cortical mapping problem.
High performance computing, storage, visualization, and database infrastructures are increasing geometrically in complexity as scientists move towards grid-based computing. While this is natural, it has the effect of ...
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ISBN:
(纸本)9780769515243
High performance computing, storage, visualization, and database infrastructures are increasing geometrically in complexity as scientists move towards grid-based computing. While this is natural, it has the effect of pushing computational capabilities beyond the reach of scientists because of the time needed to harness the infrastructure. Hiding the complexity of networked resources becomes essential if scientists are to utilize them effectively. In this work, we describe our efforts to integrate various computational chemistry components into a scientific computing environment. We briefly describe improvements we have made to individual components of the chemistry environment as well as future directions, followed by a more in-depth discussion of our strategy for integration into a grid workflow environment based on web services, which enables access to remote resources while shielding users from the complexities of the grid infrastructures. A preliminary schema for storing data obtained from computational chemistry calculations is also described.
We have adapted a miniature head mounted operating microscope for AR by integrating two very small computer displays. To calibrate the projection parameters of this so called Varioscope AR we have used Tsai’s Algorit...
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Nowadays many problems requiring huge computing power have arisen. Although the performance of digital processors doubles every year, there are certain tasks where the computation cannot be carried out within a reason...
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Nowadays many problems requiring huge computing power have arisen. Although the performance of digital processors doubles every year, there are certain tasks where the computation cannot be carried out within a reasonable time interval. Such hard problems are the analysis of big dynamical systems or real-time exact colour reproduction. The exact colour visualization of motion pictures is necessary in industrial, medical and scientific research areas. Thus, for example, exact colour reproduction is required for remote medical diagnosis or remote operation. The doctor has to see the same image that appears in reality. Device dependent colour appearance may cause faulty decisions. Nowadays these problems cannot be solved perfectly because many steps of the transformation are not completely known and the huge number of computations cannot be done in real-time even by the fastest PC. In this article we describe some methods to produce exact colours in a remote medical diagnostic system.
The ever increasing number of data-intensive scientific visualizations motivate the need for high-performance data management support. One such example is given from a simulation and visualization system that assists ...
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ISBN:
(纸本)0769510620
The ever increasing number of data-intensive scientific visualizations motivate the need for high-performance data management support. One such example is given from a simulation and visualization system that assists the physician in the planning and execution of a novel, non-invasive, and very effective treatment of brain aneurysm. The output dataset of this blood flow simulation is very large and information rich that demands an effective means to gaining insights into the nature of lime-varying flow fields. For this purpose, we built a computing environment which exploits efficient data storage and management techniques to provide a sufficient performance for real-time visualization. Our approach has substantial advantages for achieving higher access efficiency and storage utilization, yielding frame rates suitable for interactive visualization on common desktop workstations. Practical experiments indicate that the techniques developed in this environment can provide the basic building blocks for future efficient implementation of large complex data visualization systems.
With the advances in medical imaging, we can now extract quantitative information about human anatomical structures in three dimensions from images of various modalities. But visualization of anatomical structures and...
ISBN:
(纸本)3540426973
With the advances in medical imaging, we can now extract quantitative information about human anatomical structures in three dimensions from images of various modalities. But visualization of anatomical structures and finite element analysis are two technical problems for representation of biomedical objects and simulation of physiological behavior. We describe the component of our workstation that contributes to the automatic generation of 3D physical-based meshes used in biomechanical engineering analysis and visualization of complex anatomical structures. This component extends the provision of visual information of the human spine to physical-based analysis for predicting the effects of treatment. These effects range from instrumentation in deformity correction, treatments on the courses of nerves and the resulting strains to the eventual interaction between bone and implants. One of the first applications of our approach was the used of the physical-based model to investigate the injury to human spine among airforce pilots in high G flying.
This paper describes the optical system Svision including the attachment to PC's monitor and software for preparation and demonstration of stereoscopic images. This software-hardware complex provides possibility t...
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ISBN:
(纸本)0819441481
This paper describes the optical system Svision including the attachment to PC's monitor and software for preparation and demonstration of stereoscopic images. This software-hardware complex provides possibility to demonstrate 3D stereoscopic objects on the kinescope screen of usual PC's monitor, such objects are interactively controlled by user. Advantages of system Svision over analogues are the following: spectators do not need individual hardware for viewing. there are no need in rework of computer, production of attachments is simple and does not require unique techniques. The complex is used for processing and display of data measured by means of scanning-probe microscope for analysis of complicated 3D objects and also for precision measurement schemes.
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