scholarly journals Compressive Representation of Three-dimensional Models

2015 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Helton Hideraldo Bíscaro ◽  
José Paulo Lima
Keyword(s):  
Compressive Sensing ◽  
Processing Speed ◽  
Measurement Techniques ◽  
Three Dimensional ◽  
Mesh Compression ◽  
Processing Times ◽  
Recent Approach ◽  
Recent Developments ◽  
3D Scanners ◽  
Three Dimensional Models

Due to recent developments in data acquisition mechanisms, called 3d scanners, mesh compression has become an important tool for manipulating geometric data in several areas. In this context, a recent approach to the theory of signs called Compressive Sensing states that a signal can be recovered from far fewer samples than those provided by the classical theory. In this paper, we investigate the applicability of this new theory with the purpose of to obtain a compressive representation of geometric meshes. We developed an experiment which combines sampling, compression and reconstruction of various mesh sizes. Besides figuring compression rates, we also measured the relative error between the original mesh and the recovered mesh. We also compare two measurement techniques through their processing times, which are: the use of Gaussian matrices; and the use of Noiselet matrices. Gaussian matrices performed better in terms of processing speed, with equivalent performance in compression capacity. The results indicate that compressive sensing is very useful for mesh compression showing quite comparable results with traditional mesh compression techniques.

scholarly journals Editor's Note

2015 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Alberto Raposo
Keyword(s):  
Virtual Reality ◽  
Human Factors ◽  
Compressive Sensing ◽  
Computer Systems ◽  
Three Dimensional ◽  
Special Issue ◽  
Recent Approach ◽  
Dimensional Models ◽  
Three Dimensional Models

The year of 2015 starts with the first issue of JIS dedicated to HCI. The journal was created in 2008, within the scope of the Brazilian Virtual Reality community, and in 2013 and 2014 it made an approximation with the Games and HCI communities, becoming the first periodic in Brazil specifically on these areas. We believe this way the journal may open the door for more interdisciplinary research.This issue contains extended versions of five papers selected among the best full papers of IHC 2014 - XIII Brazilian Symposium on Human Factors in Computer Systems. I would like to thank Carla Leitão, Cristiano Maciel, and Simone Barbosa for their dedication acting as guest editors for this special issue, and invite you to read their editorial in the following.We also have in this issue an original paper by José Paulo de Lima and Helton Bíscaro, entitled "Compressive Representation of Three-dimensional Models''. The authors investigate the applicability of a recent approach to the theory of signs, called Compressive Sensing, to obtain a compressive representation of geometric meshes.I would like to thank the authors and reviewers that contributed to this issue of JIS, and I hope it fulfills your expectations. JIS Editorial Board is looking forward to receiving your contributions.

scholarly journals Adaptive optics in laser processing

2019 ◽  
Vol 8 (1) ◽  
Author(s):  
Patrick S. Salter ◽  
Martin J. Booth
Keyword(s):  
Adaptive Optics ◽  
Intensity Distribution ◽  
Laser Processing ◽  
Ultrafast Lasers ◽  
Three Dimensional ◽  
Processing Times ◽  
The Future ◽  
Recent Developments ◽  
Focal Intensity ◽  
Adaptive Laser

AbstractAdaptive optics are becoming a valuable tool for laser processing, providing enhanced functionality and flexibility for a range of systems. Using a single adaptive element, it is possible to correct for aberrations introduced when focusing inside the workpiece, tailor the focal intensity distribution for the particular fabrication task and/or provide parallelisation to reduce processing times. This is particularly promising for applications using ultrafast lasers for three-dimensional fabrication. We review recent developments in adaptive laser processing, including methods and applications, before discussing prospects for the future.

THE USE OF THREE-DIMENSIONAL MODELING AS A WAY OF INFORMATION AND TECHNICAL SUPPORT OF FORENSIC REGISTRATION

2018 ◽  
Author(s):  
Roman Demchyshak ◽  
Keyword(s):  
Physical Properties ◽  
3D Modeling ◽  
Three Dimensional ◽  
Technical Support ◽  
Modeling Technology ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
3D Scanners ◽  
Three Dimensional Models ◽  
Dimensional Object

The article is devoted to the issues of using three-dimensional modeling as a way of information and technical support of forensic registration. It is stated that none of the modern researches focuses on the use of three- dimensional modeling technology of information and technical support of forensic registration. An assessment of the technological capabilities of modern three-dimensional scanners (3D-scanners), which are used (or can be used) in the information and technical support of forensic registration. The technological possibilities of three-dimensional modeling are analyzed, in particular in the construction of three-dimensional models of the scene, the creation of virtual rooms for educational purposes, forensic examinations, etc. Emphasis is placed on the fact that in criminology, three-dimensional (3D) modeling is carried out according to the rules of solid modeling (in which the key is to reproduce the physical properties of three-dimensional modeling objects). It is the physical properties of forensic registration objects, as a rule, that are the key information, the fixation of which is carried out within the framework of forensic registration. It is determined that the prospects of using three-dimensional (3D) modeling during forensic registration are to ensure the possibility of creating objects of accounting using additive technologies (ie three-dimensional printing (3D- printing)). The position is expressed that the technologies of three-dimensional (3D) modeling can be applied, first of all, in: trasological accounting; ballistic accounting; cold steel accounting; registration of persons on the basis of appearance; accounting of materials, substances and products. Therefore, with 3D modeling, it is possible to reproduce a certain three-dimensional object if it has been properly scanned. The described technologies create opportunities not only to quickly create exact copies or duplicates of evidence or other objects that are placed in forensic accounting, and use them for other research or for use as objects of orientation during operational or investigative actions.

ten years of modelling to achieve haemodynamic optimisation of the total cavopulmonary connection

2004 ◽  
Vol 14 (S3) ◽  
pp. 48-52 ◽  
Author(s):  
gabriele dubini ◽  
francesco migliavacca ◽  
giancarlo pennati ◽  
marc r. de leval ◽  
edward l. bove
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Cardiovascular System ◽  
Three Dimensional ◽  
In Vitro Models ◽  
Surgical Reconstruction ◽  
Complex Anatomy ◽  
Recent Developments ◽  
Three Dimensional Models

the techniques of computational fluid dynamics are among the most powerful tools available to engineers dealing with the motion of fluids and the exchange of mass, momentum, and energy. they have recently been shown to have an increasing number of applications to the human cardiovascular system, including the fluid dynamics of surgical reconstruction of congenitally malformed parts of the cardiovascular system. in vitro models are the alternative laboratory tools with which to study fluid dynamics. the advantages of computational fluid dynamics over the in vitro models are the easy quantification of haemodynamic variables, such as rates of flow, pressure, and distribution of shear stress, and changes in geometric and fluid dynamics parameters. furthermore, using computational fluid dynamics allows the development of three-dimensional models to reproduce both the complex anatomy of the investigated region and the details of the surgical reconstruction, especially with the recent developments in magnetic resonance imaging. on the basis of the results, it is possible quantitatively to evaluate the surgical correction. this technology, which benefits greatly from the continuous improvement in hardware and software, enables cardiovascular experts and bioengineers to look at the fluid dynamics of various cardiovascular regions with increasing sophistication.

Two- and Three-Dimensional Models of Dispersion Based upon Measurements in the North Sea

1991 ◽  
Vol 24 (10) ◽  
pp. 45-53 ◽  
Author(s):  
G. C. van Dam
Keyword(s):  
North Sea ◽  
Three Dimensional ◽  
Historical Review ◽  
Particle Simulation ◽  
Simulation Methods ◽  
The North ◽  
Recent Developments ◽  
Long Time ◽  
The North Sea ◽  
Three Dimensional Models

After a brief historical review some recent developments are discussed, with an emphasis on particle simulation methods. Examples are shown of relatively short and relatively long time scale applications in connection with accidental spills and problems of continuous sources respectively.

Plastic replicas as three-dimensional models of pulps

1975 ◽  
Vol 39 (8) ◽  
pp. 544-546
Author(s):  
HL Wakkerman ◽  
GS The ◽  
AJ Spanauf
Keyword(s):  
Three Dimensional ◽  
Dimensional Models ◽  
Three Dimensional Models

Validation of a Belt Model for Prediction of Hub Forces from a Rolling Tire4

2009 ◽  
Vol 37 (2) ◽  
pp. 62-102 ◽  
Author(s):  
C. Lecomte ◽  
W. R. Graham ◽  
D. J. O’Boy
Keyword(s):  
Internal Pressure ◽  
Equations Of Motion ◽  
Three Dimensional ◽  
Prediction Method ◽  
Analytical Models ◽  
Beam Model ◽  
Impedance Boundary ◽  
Bending Waves ◽  
Tire Rotation ◽  
Three Dimensional Models

Abstract An integrated model is under development which will be able to predict the interior noise due to the vibrations of a rolling tire structurally transmitted to the hub of a vehicle. Here, the tire belt model used as part of this prediction method is first briefly presented and discussed, and it is then compared to other models available in the literature. This component will be linked to the tread blocks through normal and tangential forces and to the sidewalls through impedance boundary conditions. The tire belt is modeled as an orthotropic cylindrical ring of negligible thickness with rotational effects, internal pressure, and prestresses included. The associated equations of motion are derived by a variational approach and are investigated for both unforced and forced motions. The model supports extensional and bending waves, which are believed to be the important features to correctly predict the hub forces in the midfrequency (50–500 Hz) range of interest. The predicted waves and forced responses of a benchmark structure are compared to the predictions of several alternative analytical models: two three dimensional models that can support multiple isotropic layers, one of these models include curvature and the other one is flat; a one-dimensional beam model which does not consider axial variations; and several shell models. Finally, the effects of internal pressure, prestress, curvature, and tire rotation on free waves are discussed.

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