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检索条件"任意字段=International Symposium on 3D Data Processing Visualization and Transmission"

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Fusing multiple color images for texturing models

Fusing multiple color images for texturing models

引用

Proceedings - 2nd international symposium on 3d data processing, visualization, and transmission. 3dPVT 2004

作者： Bannai, Nobuyuki Agathos, Alexander Fisher, Robert B. School of Informatics University of Edinburgh

ISBN: (纸本)0769522238

A commonly encountered problem when creating 3d models of large real scenes is unnatural color texture fusion. due to variations in lighting and camera settings (both manual and automatic), captured color texture maps of the same structure can have very different colors. When fusing multiple views to create larger models, this color variation leads to a poor appearance with odd color tilings on homogeneous surfaces. This paper extends previous research on pairwise global color correction to multiple overlapping images. The central idea is to estimate a set of blending transformations that minimize the overall color discrepancy in the overlapping regions, thus spreading residual color errors, rather than letting them accumulate. © 2004 IEEE.

关键词： Color image processing

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3d stereoscopic image pairs by depth-map generation

3D stereoscopic image pairs by depth-map generation

引用

Proceedings - 2nd international symposium on 3d data processing, visualization, and transmission. 3dPVT 2004

作者： Battiato, S. Capra, A. Curti, S. La Cascia, M. Università di Catania Dipto. di Matematica ed Informatica 95125 Catania Italy STMicroelectronics AST Catania Lab. Stradale Primosole 50 95121 Catania Italy Università di Palermo DINFO Viole delle scienze 90128 Palermo Italy

ISBN: (纸本)0769522238

This paper presents a new unsupervised technique aimed to generate stereoscopic views estimating depth information from a single input image. Using a single input image, vanishing lines/points are extracted using a few heuristics to generate an approximated depth map. The depth map is then used to generate stereo pairs. The overall method is well suited for real time application and works also on CFA (Colour Filtering Array) data acquired by consumer imaging devices. Experimental results on a large dataset are reported. © 2004 IEEE.

关键词： Special effects

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The influence of shape on image correspondence

The influence of shape on image correspondence

引用

2nd international symposium on 3d data processing, visualization, and transmission (3dPVI 2004)

作者： Ogale, AS Aloimonos, Y Univ Maryland Ctr Automat Res College Pk MD 20742 USA

ISBN: (纸本)0769522238

We examine the implications of shape on the process of finding dense correspondence and half-occlusions for a stereo pair of images. The desired property of the depth map is that it should be a piecewise continuous function which is consistent with the images and which has the minimum number of discontinuities. To zeroeth order piecewise continuity becomes piecewise constancy. Using this approximation, we first discuss an approach for dealing with such a fronto-parallel shapeless world, and the problems involved therein. We then introduce horizontal and vertical slant to create a first order approximation to piecewise continuity. We highlight the fact that a horizontally slanted surface (ie. having depth variation in the direction of the separation of the two cameras) will appear horizontally stretched in one image as compared to the other image. Thus, while corresponding two images, N pixels on a scanline in one image may correspond to a different number of pixels M in the other image, which has consequences with regard to sampling and occlusion detection. We also discuss the asymmetry between vertical and horizontal slant, and the central role of non-horizontal edges in the context of vertical slant. Using experiments, we discuss cases where existing algorithms fail, and how the incorporation of new constraints provides correct results.

关键词： Image processing

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Robust structure from motion under weak perspective

Robust structure from motion under weak perspective

引用

2nd international symposium on 3d data processing, visualization, and transmission (3dPVI 2004)

作者： Hajder, L Chetverikov, d Vajk, I Comp & Automat Res Inst Budapest Hungary

ISBN: (纸本)0769522238

It is widely known that, for the affine camera model, both shape and motion data can be factorized directly from the measurement matrix constructed from 2d image points coordinates. However classical algorithms for Structure from Motion (SfM) are not robust: measurement outliers, that is, incorrectly detected or matched feature points can destroy the result. A few methods to robustify SfM have already been proposed. different outlier detection schemes have been used. We examine an efficient algorithm by Trajkovic et al. [13] who use affine camera model and the Least Median of Squares (LMedS) method to separate inliers from outliers. LMedS is only applicable when the ratio of inliers exceeds 50%. We show that the Least Trimmed Squares (LTS) method is more efficient in robust SfM than LMedS. In particular we demonstrate that LTS can handle inlier ratios below 50%. We also show that using the real (Euclidean) motion data results in a more precise SfM algorithm that using the affine camera model. Based on these observations, we propose a novel robust SfM algorithm and discuss its advantages and limits. The proposed method and the Trajkovic procedure are quantitatively compared on synthetic data in different simulated situations. The methods are also tested on synthesized and real video sequences.

关键词： Image processing

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Thickness histogram and statistical harmonic representation for 3d model retrieval

Thickness histogram and statistical harmonic representation ...

引用

Proceedings - 2nd international symposium on 3d data processing, visualization, and transmission. 3dPVT 2004

作者： Liu, Yi Pu, Jiantao Zha, Hongbin Liu, Weibin Uehara, Yusuke Natl. Lab. on Machine Perception Peking University Beijing 100871 China Internet Application Lab. Fujitsu R and D Center Co. Ltd. Language Processing Lab. Information Technology Media Lab. Fujitsu Laboratories Ltd.

ISBN: (纸本)0769522238

Similarity measuring is a key problem for 3d model retrieval. In this paper, we propose a novel shape descriptor "Thickness Histogram" (TH) by uniformly estimating thickness of a model using statistical methods. It is translation and rotation-invariant, discriminative to different shapes, and very efficient to compute with the Shape distribution (Sd) proposed by Osada etc. For high performance of the retrieval, we propose a robust method for translating the directional form of the statistical distribution to the harmonic representation. By summing up energies at different frequencies, a matrix shape signature is formed to provide an exhaustive characterization of 3d geometry. Experiments show that the performance of the statistical harmonic representation is among the top ones of existing shape descriptors. © 2004 IEEE.

关键词： Scanning

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Enhanced vector quantization for data reduction and filtering

Enhanced vector quantization for data reduction and filterin...

引用

2nd international symposium on 3d data processing, visualization, and transmission (3dPVI 2004)

作者： Ferrari, S Frosio, I Piuri, V Borghese, NA Univ Milan Dept Comp Sci MAVR Lab I-20135 Milan Italy

ISBN: (纸本)0769522238

Modem automatic digitizers can sample huge amounts of 3d data points on the object surface in a short time. Point based graphics is becoming a popular framework to reduce the cardinality of these data sets and to filter measurement noise, without having to store in memory and process mesh connectivity. Main contribution of this paper is the introduction of soft clustering techniques in the field of point clouds processing. In this approach data points are not assigned to a single cluster, but they contribute in the determination of the position of several cluster centres. As a result a better representation of the data is achieved. In Soft clustering techniques, a data set is represented with a reduced number of points called Reference Vectors (RV), which minimize an adequate error measure. As the position of the RVs is determined by "learning", which can be viewed as an iterative optimization procedure, they are inherently slow. We show here how partitioning the data domain into disjointed regions called hyperboxes (HB), the computation can be localized and the computational time reduced to linear in the number of data points (O(N)), saving more than 75% on real applications with respect to classical soft-VQ solutions, making therefore VQ suitable to the task. The procedure is suitable for a parallel HW implementation, which would lead to a complexity sub-linear in N. An automatic procedure for setting the voxel side and the other parameters can be derived from the data-set analysis. Results obtained in the reconstruction of faces of both humans and puppets as well as on models from clouds of points made available on the WEB are reported and discussed in comparison with other available methods.

关键词： Signal filtering and prediction

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Blind watermarking of 3d shapes using localized constraints

Blind watermarking of 3D shapes using localized constraints

引用

Proceedings - 2nd international symposium on 3d data processing, visualization, and transmission. 3dPVT 2004

作者： Bors, Adrian G. Dept. of Computer Science University of York York Y010 5DD United Kingdom

ISBN: (纸本)0769522238

This paper develops a digital watermarking methodology for 3-d graphical objects defined by polygonal meshes. In watermarking or fingerprinting the aim is to embed a code in a given media without producing identifiable changes to it. One should be able to retrieve the embedded information even after the shape had suffered various modifications. Two blind watermarking techniques applying perturbations onto the local geometry for selected vertices are described in this paper. The proposed methods produce localized changes of vertex locations that do not alter the mesh topology. A study of the effects caused by vertex location modification is provided for a general class of surfaces. The robustness of the proposed algorithms is tested at noise perturbation and object cropping. © 2004 IEEE.

关键词： Watermarking

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3d shape registration using regularized medial scaffolds

3D shape registration using regularized medial scaffolds

引用

Proceedings - 2nd international symposium on 3d data processing, visualization, and transmission. 3dPVT 2004

作者： Chang, Ming-Ching Leymarie, Frederic F. Kimia, Benjamin B. LEMS Division of Engineering Brown University Providence RI 02912 United States

ISBN: (纸本)0769522238

This paper proposes a novel method for global registration based on matching 3d medial structures of unorganized point clouds or triangulated meshes. Most practical known methods are based on the Iterative Closest Point (ICP) algorithm, which requires an initial alignment close to the globally optimal solution to ensure convergence to a valid solution. Furthermore, it can also fail when there are points in one dataset with no corresponding matches in the other dataset. The proposed method automatically finds an initial alignment close to the global optimal by using the medial structure of the datasets. For this purpose, we first compute the medial scaffold of a 3d dataset: a 3d graph made of special shock curves linking special shock nodes. This medial scaffold is then regularized exploiting the known transitions of the 3d medial axis under deformation or perturbation of the input data. The resulting simplified medial scaffolds are then registered using a modified graduated assignment graph matching algorithm. The proposed method shows robustness to noise, shape deformations, and varying surface sampling densities. © 2004 IEEE.

关键词： Image reconstruction

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Interactive modeling from dense color and sparse depth

Interactive modeling from dense color and sparse depth

引用

Proceedings - 2nd international symposium on 3d data processing, visualization, and transmission. 3dPVT 2004

作者： Popescu, Voicu Sacks, Elisha Bahrautov, Gleb Computer Science Department Purdue University

ISBN: (纸本)0769522238

We are developing a system for interactive modeling of real world scenes, The acquisition device consists of a video camera enhanced with an attached laser system. As the operator sweeps the scene, the device acquires dense color and sparse depth frames that are registered and merged into a point-based model. The evolving model is rendered continually to provide immediate operator feedback. The interactive modeling pipeline runs at five frames per second. We model scenes in two modes based on their geometric complexity. Scenes that contain large smooth surfaces are modeled freehand;scenes that contain small uneven surfaces are modeled using a parallax-free camera bracket. © 2004 IEEE.

关键词： data acquisition

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A variational analysis of shape from specularities using sparse data

A variational analysis of shape from specularities using spa...

引用

2nd international symposium on 3d data processing, visualization, and transmission (3dPVI 2004)

作者： Solem, JE Aanæs, H Heyden, A Malmo Univ Sch Technol & Soc Malmo Sweden

ISBN: (纸本)0769522238

Looking around in our every day environment, many of the encountered objects are specular to some degree. Actively using this fact when reconstructing objects front image sequences is the scope of the shape from specularities problem. One reason why this problem is important is that standard structure from motion techniques fail when the object surfaces are specular Here this problem is addressed by estimating surface shape using information from the specular reflections. A specular reflection gives constraints on the surface normal. The approach taken in this paper differs significantly from many earlier shape from specularities methods since the normal data used is sparse. The main contribution of this paper is to give a solid foundation for shape from specularities problems. Estimation of surface shape using reflections is formulated as a variational problem and the surface is represented implicitly using a level set formulation. A functional incorporating all surface constraints is proposed and the corresponding level set motion PdE is explicitly derived. This motion is then proven to minimize the functional. As a part of this functional a variational approach to normal alignment is proposed and analyzed. Also novel methods for implicit surface interpolation to sparse point sets are presented together with a variational analysis. Experiments on both real and synthetic data support the proposed method.

关键词： Image reconstruction

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