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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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Recognition of object contours from stereo images: an edge combination approach

Recognition of object contours from stereo images: an edge c...

引用

international symposium on 3d data processing visualization and transmission

作者： M. Gelautz d. Markovic Institute of Software Technology and Interactive Systems University of Technology Vienna Vienna Austria

We present an algorithm to combine edge information from stereo-derived depth maps with edges from the original intensity/color image to improve the contour detection in images of natural scenes. After computing the disparity map, we generate a so-called "edge combination image", which relies on those edges of the original image that are also present in the stereo map. We describe an algorithm to identify corresponding intensity and depth edges, which are usually slightly displaced due to nonperfect stereo reconstruction. Our experiments demonstrate how the proposed edge combination approach can be used in conjunction with an active contours algorithm to achieve better segmentation results.

关键词： Image recognition Stereo vision Image edge detection Color Object segmentation Active contours Application software digital cameras Interactive systems Software algorithms

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Facial view synthesis from a single image using shape from shading

Facial view synthesis from a single image using shape from s...

引用

international symposium on 3d data processing visualization and transmission

作者： W.A.P. Smith A. Robles-Kelly E.R. Hancock Department of Computer Science University of York York UK

We present a facial view synthesis technique based on explicit shape and reflectance information extracted from a single image. The technique combines an image based reflectance estimation process with a novel method of interpolating between needle-maps recovered using shape from shading. This allows images of a face to be synthesised under novel lighting, pose and skin reflectance given only one example image. We exploit facial symmetry by reflecting the needle-map of a rotated face to yield the needle-map of the face rotated in the opposite direction. This provides two needle-maps between which interpolation can be performed.

关键词： Shape Face recognition Reflectivity Image recognition Computer science data mining Skin Interpolation Robustness degradation

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Neural mesh ensembles

Neural mesh ensembles

引用

international symposium on 3d data processing visualization and transmission

作者： I. Ivrissimtzis Yunjin Lee Seungyong Lee W.-K. Jeong H.-P. Seidel MPI Informatik Germany POSTECH and MPI Informatik South Korea University of Utah USA

This work proposes the use of neural network ensembles to boost the performance of a neural network based surface reconstruction algorithm. Ensemble is a very popular and powerful statistical technique based on the idea of averaging several outputs of a probabilistic algorithm. In the context of surface reconstruction, two main problems arise. The first is finding an efficient way to average meshes with different connectivity, and the second is tuning the parameters for surface reconstruction to maximize the performance of the ensemble. We solve the first problem by voxelizing all the meshes on the same regular grid and taking majority vote on each voxel. We tune the parameters experimentally, borrowing ideas from weak learning methods.

关键词： Surface reconstruction Neural networks Surface fitting Reconstruction algorithms Shape data visualization Laser tuning Convergence Voting Learning systems

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Robust 3d segmentation for underwater acoustic images

Robust 3D segmentation for underwater acoustic images

引用

international symposium on 3d data processing visualization and transmission

作者： L. Tao U. Castellani V. Murino Computer Science Department Tsinghua University Beijing China Dipartimento di Informatica University of Verona Verona Italy

A technique for 3d acoustic image segmentation and modelling is proposed. Especially, in the underwater environment, in which optical sensors suffer from visibility problems, the acoustical devices may provide efficient solutions, but, on the other hand, acoustic image interpretation is surely more difficult for a human operator. The proposed application involves the use of an acoustic camera which directly acquires images structured as a set of 3d points. due to the noisy nature of this type of data, the segmentation problem becomes more challenging and the standard algorithms for range image segmentation are likely to fail. The proposed method is based on a simplified version of the so called recover and select paradigm in which the seed areas, from which the segmentation starts, are generated by adopting a robust approach based on the RANSAC (Random Sample And Consensus) algorithm. Superquadric primitives are directly recovered from raw data without any pre-segmentation processing. Experimental trials using both synthetic and real acoustical images confirm the goodness of the method, and a large robustness of the resulting segmented images, associated to a relatively low computational load.

关键词： Robustness Image segmentation Underwater acoustics Acoustic noise Solid modeling Acoustic devices Sea surface Surface fitting Optical sensors data mining

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Projection model, 3d reconstruction and rigid motion estimation from non-central catadioptric images

Projection model, 3D reconstruction and rigid motion estimat...

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international symposium on 3d data processing visualization and transmission

作者： N. Goncalves H. Araujo Institute of Systems and Robotics-Coimbra University of Coimbra Coimbra Portugal

This paper addresses the problem of rigid motion estimation and 3d reconstruction in vision systems where it is possible to recover the incident light ray direction from the image points. Such systems include pinhole cameras and catadioptric cameras. Given two images of the same scene acquired from two different positions, the transformation is estimated by means of an iterative process. The estimation process aims at having corresponding incident rays intersecting at the same 3d point. Geometrical relationships are derived to support the estimation method. Furthermore, this paper also addresses the problem of the mapping from 3d points to image points, for non-central catadioptric cameras with mirror surfaces given by quadrics. The projection model presented can be expressed in a non-linear equation of only one variable, being more stable and easier to solve than the classical Snell's law. Experiments with real images are presented, by using simulated annealing as estimation method.

关键词： Image reconstruction Motion estimation Cameras Mirrors Surface reconstruction Machine vision Geometry Application software Context modeling Optical reflection

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RoboScan: an automatic system for accurate and unattended 3d scanning

RoboScan: an automatic system for accurate and unattended 3D...

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international symposium on 3d data processing visualization and transmission

作者： M. Callieri A. Fasano G. Impoco P. Cignoni R. Scopigno G. Parrini G. Biagini ISTI-CNR Italy Scienzia Machinale

We describe an automatic system for fast unattended acquisition of accurate and complete 3d models, called RoboScan. The design goal is to reduce the three main bottlenecks in human-assisted 3d scanning: the selection of the range maps to be taken (view planning), the positioning of the scanner in the environment, and the range maps' alignment. The system is designed around a commercial laser-based 3d scanner moved by a robotic arm. The acquisition session is organised in two stages. First, an initial sampling of the surface is performed by the automatic selection of a set of views. Then, some added views are automatically selected, acquired and merged to the initial set in order to fill the surface regions left unsampled. Both the initial set of range maps and the subsequently added ones are post-processed automatically, by using the known scanner positions to initialise the alignment phase. Results of the assessment of the system on real acquisitions are presented and discussed.

关键词： Robotics and automation Sampling methods Hardware Orbital robotics Optical design Laser modes Image reconstruction Algorithm design and analysis Cultural differences Shape

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disordered patterns projection for 3d motion recovering

Disordered patterns projection for 3D motion recovering

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international symposium on 3d data processing visualization and transmission

作者： A. Adan F. Molina L. Morena Departmento de Ingeniería Eléctrica Electrónica y Automática Universidad de Castilla La Mancha Ciudad Real Spain

We present a new color structured light technique based on a disordered codeword strategy. The aim of this method is to recover 3d information in moving scenes in such a way that the correspondence problem is easily and robustly solved. With this goal in mind a six-connectivity topology has been introduced in our pattern and color features have been inserted on it. Repetition and disorder are allowed in the codeword which implies that the Hamming distance between contiguous codewords increases. As a consequence of that, code loss circumstances can be efficiently handled. Additionally, computational cost in the code recovering phase is highly reduced since codewords are defined as sets. A structured light projection system has been built in our lab and a wide test under real moving conditions has been carried out. This experimentation has been performed on medium resolution and for slow movements specifications giving promising results.

关键词： Layout Encoding Cameras Image segmentation Robustness Topology Hamming distance Computational efficiency System testing Pixel

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Reliability and judging fatigue reduction in 3d perceptual quality estimation

Reliability and judging fatigue reduction in 3D perceptual q...

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international symposium on 3d data processing visualization and transmission

作者： I. Cheng A. Basu Department of Computing Science University of Alberta Edmonton Canada

Many factors, such as the number of vertices and the resolution of texture, can affect the display quality of 3d objects. When the resources of a graphics system are not sufficient to render the ideal image, degradation is inevitable. It is therefore important to study how individual factors will affect the overall quality, and how the degradation can be controlled given limited resources. In this paper, the essential factors determining the display quality are reviewed. We provide more details on our earlier presentation [Y. Pan et al., (2003)] on integrating two important ones, resolution of texture and resolution of mesh, to model a perceptual metric. We then present a preliminary study of the reliability of the perceptual experiments. Experiments demonstrate that the reliability of our user evaluations to be quite high. Finally, we also propose an approach for reducing user fatigue while performing perceptual quality evaluations.

关键词： Fatigue Life estimation Humans Lighting Pixel Visual system Image coding degradation Performance evaluation Spatial resolution

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Testing reflectance models against radiance data

Testing reflectance models against radiance data

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international symposium on 3d data processing visualization and transmission

作者： H. Ragheb A. Robles-Kelly E.R. Hancock Department of Computer Science University of York York UK Department of Computer Engineering Bu-Ali Sina University Hamedan Iran

We describe an empirical investigation of departures from Lambert's law for rough and shiny surfaces. We commence by using a recently reported method to recover estimates of the surface radiance function for objects illuminated in the viewer direction. This method is nonparametric, and offers the advantage that it is simple to use since it does not require detailed camera calibration. We compare the radiance data with a number of phenomenological and physics-based reflectance models. The models studied include those of Oren-Nayar, Wolff and different variants of the Beckmann model. The main conclusion of the study is that among these models the best fit to the empirical data is found to be the Wolff model for smooth objects and the modified Beckmann model for rough objects.

关键词： Testing Reflectivity Rough surfaces Surface roughness Light scattering Computer vision Computer graphics Surface waves Computer science Cameras

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3d shape registration using regularized medial scaffolds

3D shape registration using regularized medial scaffolds

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international symposium on 3d data processing visualization and transmission

作者： M.-C. Chang F.F. Leymarie B.B. Kimia LEMS Division of Engineering Brown University Providence RI USA

This work proposes a 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.

关键词： Shape Electric shock Clouds Iterative methods Iterative closest point algorithm Iterative algorithms Joining processes Noise robustness Noise shaping Sampling methods

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