In scientific visualization, interaction tools allow users to navigate through volume and explore its features, helping information understanding. the use of sound as a data display tool (sonfication) has also been sh...
详细信息
ISBN:
(纸本)0769520324
In scientific visualization, interaction tools allow users to navigate through volume and explore its features, helping information understanding. the use of sound as a data display tool (sonfication) has also been shown to support information understanding and may help dealing with adding dimensions to a visual display. However, thus far the issues of data exploration tools and sonfication have been treated separately by the visualization community. this paper presents an interaction model for scientific visualization that considers the main issues related to sonfication, and shows a prototype implemented to illustrate the proposed model. the prototype is a class library that implements a number of interaction tools with sonfication functions, which is freely available and can be employed in general purpose visualization applications.
this paper presents a novel and more successful learning based approach to extracting low level features in a retina-like (log-polar) image representation. the low level features (edges, bars, blobs and ends) are base...
详细信息
ISBN:
(纸本)0769513301
this paper presents a novel and more successful learning based approach to extracting low level features in a retina-like (log-polar) image representation. the low level features (edges, bars, blobs and ends) are based on Marr's primal sketch hypothesis for the human visual system [10]. the feature extraction process used a neural network that learns examples of the features in a window of receptive fields of the image representation. An architecture designed to encode the feature's class, position, orientation and contrast has been proposed and tested. Success depended on the incorporation of a function to normalise the feature's orientation and a PCA pre-processing module to produce better separation in the feature space.
this work presents the application of advanced analysis processes and datamining to images produced by scanning probe microscopy in polymers samplers. these techniques are applied to two specific problems: statistical...
详细信息
ISBN:
(纸本)0769513301
this work presents the application of advanced analysis processes and datamining to images produced by scanning probe microscopy in polymers samplers. these techniques are applied to two specific problems: statistical characterization of polydispersivity in films of poly (o-methoxyaniline) (POMA) and morphological analysis of substrates of polymers used to produce liquid crystals alignment.
Optical microscopic images, especially with a nonconfocal microscope, are fundamentally limited because the optical transfer function (the Fourier transform of the point-spread function) is zero over a region of the s...
详细信息
ISBN:
(纸本)9780769529967
Optical microscopic images, especially with a nonconfocal microscope, are fundamentally limited because the optical transfer function (the Fourier transform of the point-spread function) is zero over a region of the spatial-frequency domain. Iterative algorithms were developed for the restoration and extrapolation of diffraction-limited imagery. In this paper we present the effectiveness of an iterative method based on the Richardson-Lucy algorithm for image restoration and a simultaneous modified version of Gerchberg-Papoulis method to extrapolate the spectrum and control the noise amplification. Good convergence stabilization results were achieved and also good numerical results were observed.
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.
this paper proposes a new rotation-invariant and scale-invariant representation for texture image retrieval based on Steerable Pyramid Decomposition. By calculating the mean and standard deviation of decomposed image ...
详细信息
ISBN:
(纸本)9780769529967
this paper proposes a new rotation-invariant and scale-invariant representation for texture image retrieval based on Steerable Pyramid Decomposition. By calculating the mean and standard deviation of decomposed image subbands, the texture feature vectors are extracted. To obtain rotation or scale invariance, the feature elements are aligned by considering either the dominant orientation or dominant scale of the input textures. Experiments were conducted on the Brodatz database aiming to compare our approach to the conventional Steerable Pyramid Decomposition, and a recent proposal for texture characterization based on Gabor Wavelets with regard to their retrieval effectiveness. Results demonstrate the superiority of the proposed method in rotated and scaled image datasets.
In this paper we present further results of the application of Dempster-Shafer theory for uncertainty reasoning in corresponding distorted images in computer Vision. In a previous work [12], the model was applied to c...
详细信息
ISBN:
(纸本)0769520324
In this paper we present further results of the application of Dempster-Shafer theory for uncertainty reasoning in corresponding distorted images in computer Vision. In a previous work [12], the model was applied to correspond radiometrically distorted images, that is, images with differences in brightness and contrast, as an extension of the work developed in [I I]. the results showed the model is robust when dealing with pairs of non-equalized images and encouraged its to try to correspond geometric distorted images, that is, pairs of images in which one is rotated in relation to the other. In the conducted experiments, the right image was rotated by different angles to simulate the desired geometric distortions. the model was applied to a pair of rotated images and it successfully established the correspondence of a pair of points. As in previous works, the correspondence evidences are based on the contextual and structural features of the points and their combination is performed Dempster-Shafer's rule of combination for uncertainty reasoning. A search process maximizes the Belief on the combined evidences.
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 ...
详细信息
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.
We present the assessment of two classification procedures using a Monte Carlo experience and Landsat data. Classification performance is hard to assess with generality due to the huge number of variables involved. In...
详细信息
ISBN:
(纸本)0769526861
We present the assessment of two classification procedures using a Monte Carlo experience and Landsat data. Classification performance is hard to assess with generality due to the huge number of variables involved. In this case we consider the problem of classifying multispectral optical imagery with pointwise Gaussian Maximum Likelihood and contextual ICM (Iterated Conditional Modes), with and without errors in the training stage. Using simulation the ground truth is known and, therefore, precise comparisons are possible. the contextual approach proved being superior than the pointwise one, at the expense of requiring more computational resources, with both real and simulated data. Quantitative and qualitative results are discussed.
the single triangle-strip loop generation algorithm on a triangulated two-manifold presented by Gopi and Eppstein [4] is based on the guaranteed existence of a perfect matching in its dual graph. However such a perfec...
详细信息
ISBN:
(纸本)0769526861
the single triangle-strip loop generation algorithm on a triangulated two-manifold presented by Gopi and Eppstein [4] is based on the guaranteed existence of a perfect matching in its dual graph. However such a perfect matching is not guaranteed in the dual graph of triangulated manifolds with boundaries. In this paper we present algorithms that suitably modify the results of the dual graph matching to generate a single strip loop on manifolds with boundaries. Further the algorithm presented in [4] can produce only strip loops, but not linear strips. We present an algorithm that does topological surgery to construct linear strips, with user-specified start and end triangles, on manifolds with or without boundaries. the main contributions of this paper include graph algorithms to handle unmatched triangles, reduction of the number of Steiner vertices introduced to create strip loops, and finally a novel method to generate single linear strips with arbitrary start and end positions.
暂无评论