To reconstruct a topologically consistent 3D surface model is a challenging problem. In this paper we present an algorithm that estimates from a range image, without registering and converting it into a volumetric dat...
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ISBN:
(纸本)0769513301
To reconstruct a topologically consistent 3D surface model is a challenging problem. In this paper we present an algorithm that estimates from a range image, without registering and converting it into a volumetric data, the most probable topology of a surface to be reconstructed. In our algorithm we start with a closed initial mesh and preserve its "closeness" during the reconstruction process. Some experiments were carried out to validate our proposal.
We present a parametric model for feather modeling in computergraphics. the model is based on Bezier curves and allows easy generation of many feather structures through manipulation of the parameters.
ISBN:
(纸本)0769513301
We present a parametric model for feather modeling in computergraphics. the model is based on Bezier curves and allows easy generation of many feather structures through manipulation of the parameters.
this paper introduces a new connected filter which provides image simplification in terms of flat zone and graylevel reduction. this filtering consists in application of morphological operators to the histogram. It is...
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ISBN:
(纸本)0769513301
this paper introduces a new connected filter which provides image simplification in terms of flat zone and graylevel reduction. this filtering consists in application of morphological operators to the histogram. It is done because each object in the image has a significative distribution of graylevels in the histogram. In other words, that is enough to classify the distributions in the histogram for simplification of that objects. It is also shown some experimental results, where the proposed method is compared to other classical ones applied to flat zone and graylevel reduction.
We present methods for synthesizing 3D shape features on subdivision surfaces using multiscale procedural techniques. Multiscale synthesis is a powerful approach for creating surfaces with different levels of detail. ...
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ISBN:
(纸本)0769513301
We present methods for synthesizing 3D shape features on subdivision surfaces using multiscale procedural techniques. Multiscale synthesis is a powerful approach for creating surfaces with different levels of detail. Our methods can also blend multiple example multiresolution surfaces, including procedurally-defined surfaces as well as captured models.
We present a CAD system for skeletal age assessment based on Tanner-Whitehouse method. Using digital X-ray left hand images, maturity indicators are searched by means of a interactive process. Results indicate that th...
ISBN:
(纸本)0769513301
We present a CAD system for skeletal age assessment based on Tanner-Whitehouse method. Using digital X-ray left hand images, maturity indicators are searched by means of a interactive process. Results indicate that this approach is useful to speed up the analysis of growth disorders.
the estimation of left ventricle motion and deformation from series of images has been an area of attention in the medical image analysis and still remains and open and challenging problem. the proper motion tracking ...
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ISBN:
(纸本)0769513301
the estimation of left ventricle motion and deformation from series of images has been an area of attention in the medical image analysis and still remains and open and challenging problem. the proper motion tracking of left ventricle wall can contribute to isolate the location and extent of ischemic or infarcted myocardium. We present a method that automatically estimates the velocity vector field for a beating heart based on the study of variation in frequency content of a time series of non-stationary images. Results obtained withthis automated method in synthetic images and cardiac gated-SPECT images are presented.
this paper describes the design and implementation of NISVAS, an application for interactive visualization of large three-dimensional datasets produced by scientific applications that was developed in Java/Java3D. Dat...
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ISBN:
(纸本)0769513301
this paper describes the design and implementation of NISVAS, an application for interactive visualization of large three-dimensional datasets produced by scientific applications that was developed in Java/Java3D. Data visualization with NISVAS maps dataset magnitudes into color, symbols and vectors. this paper presents the concepts and requirements for NISVAS graphical processing and user interface. the user interface is easy to use and learn, and supports different levels of user expertise. User reactions to NISVAS showed that all objectives were met, especially those relating to application performance and ease of use. Concluding remarks include directions for future development.
作者：
Clua, EWGDreux, MFeijó, BICAD
Department of Computer Science PUC - Rio Brazil ICAD
Department of Mechanical Engineering PUC - Rio Brazil
In order to obtain models of complex virtual environments, there are many solutions that make use of image-based rendering techniques. When using a set of images to represent an element in space as a billboard, there ...
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ISBN:
(纸本)0769513301
In order to obtain models of complex virtual environments, there are many solutions that make use of image-based rendering techniques. When using a set of images to represent an element in space as a billboard, there are some problems related withthe shading calculations, once these elements are just planes in space. this article presents a new approach for shading objects represented by images, which divides the problem into two parts: the shading maps generation for an object with specific set of lights in the environment and real-time shading simulation for a specific observer point of view and object location.
fMRI is a non-invasive technique to evaluate brain areas related to a requested task. the event-related fMRI is one kind of its design, which permits not only spatial resolution, but also temporal correlation. this in...
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ISBN:
(纸本)0769513301
fMRI is a non-invasive technique to evaluate brain areas related to a requested task. the event-related fMRI is one kind of its design, which permits not only spatial resolution, but also temporal correlation. this information may be more easily understood by the clinicians, if showed in a dynamic way. the aim of this paper is to describe a fMRI visualization system to expose the brain images, in the best view to stand out the areas of activity as long as they appear. It will empower the technique, not only to impress the clinicians, but also to enhance the importance of temporal connectivities. this system will be a module of the CAVERNA virtual reality.
this paper proposes a new method for image denoising with edge preservation, based on image multiresolution decomposition by a redundant wavelet transform. In our approach, edges are implicitly located and preserved i...
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ISBN:
(纸本)0769513301
this paper proposes a new method for image denoising with edge preservation, based on image multiresolution decomposition by a redundant wavelet transform. In our approach, edges are implicitly located and preserved in the wavelet domain, while noise is filtered out. At each resolution, the coefficients associated to noise and coefficients associated to edges are modeled by Gaussians, and a shrinkage function is assembled. the shrinkage functions are combined in consecutive resolution, and geometric constraints are applied to preserve edges that are not isolated. Finally, the inverse wavelet transform is applied to the modified coefficients. this method is adaptive, and performs well for images contaminated by natural and artificial noise.
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