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Interactive walkthroughs using "morphable 3d-mosaics

Interactive walkthroughs using "morphable 3D-mosaics

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

作者： Komodakis, N Pagonis, G Tziritas, G Univ Crete Dept Comp Sci Iraklion Greece

ISBN: (纸本)0769522238

This paper presents a hybrid (geometry- & image-based) technique suitable for providing interactive walkthroughs of large, complex outdoor scenes. Motion is restricted along a smooth predefined path and the input to the system is a sparse set of stereoscopic views at certain points (key-positions) along that path (one view per position). An approximate local 3d model is constructed from each view, capable of capturing photometric and geometric properties of the scene only locally. Then during the rendering process, a continuous morphing (both photometric & geometric) takes place between successive local 3d models, using what we call a "morphable 3d-model". The morphing proceeds in a physically-valid way. For this reason, a wide-baseline image matching technique is proposed, handling cases where the wide baseline between the two images is mainly due to a looming of the camera. Our system can be extended in the event of multiple stereoscopic views (and therefore multiple local models) per key-position of the path (related by a camera rotation). In that case one local 3d-mosaic (per key-position) is constructed comprising all local 3d models therein and a "morphable 3d-mosaic" is used during the rendering process. A partial-differential equation is adopted to handle the problem of geometric consistency of each 3d-mosaic.

关键词： Image processing

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A unified representation for interactive 3d modeling

A unified representation for interactive 3D modeling

引用

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

作者： Tubić, dragan Hébert, Patrick deschênes, Jean-daniel Laurendeau, denis Comp. Vision and Systems Laboratory University Laval Qué. Canada

ISBN: (纸本)0769522238

Interactive 3d modeling is the process of building a 3d model of an object or a scene in real-time while the 3d (range) data is acquired. This is possible only if the computational complexity of all involved algorithms is linear with respect to the amount of data. We propose a new framework for 3d modeling where a complete modeling chain meets with this requirement. The framework is based on the use of vector fields as an implicit surface representation. Each modeling step, registration, surface reconstruction, geometric fusion, compression and visualization is solved and explained using the vector fields without any intermediate representations. The proposed framework allows model reconstruction from any type of 3d data, surface patches, curves, unorganized sets of points or a combination of these. © 2004 IEEE.

关键词： Image reconstruction

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Photo-consistency based registration of an uncalibrated image pair to a 3d surface model using genetic algorithm

Photo-consistency based registration of an uncalibrated imag...

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

作者： Jankó, Z Chetverikov, dT Comp & Automat Res Inst Budapest Hungary

ISBN: (纸本)0769522238

We consider the following data fusion problem. A 3d object with textured Lambertian surface is measured and independently photographed. A triangulated model of the object and two uncalibrated images are obtained. The goal is to precisely register the images to the model. Solving this problem is necessary for building a geometrically accurate, photorealistic model from laser-scanned 3d data and high quality images. Recently, we have proposed a novel method that generalises the photo-consistency approach by Clarkson et al. [2] to the case of uncalibrated cameras, when both intrinsic and extrinsic parameters are unknown. This gives a user the freedom of taking the pictures by a conventional digital camera, from arbitrary positions and with varying zoom. The method is based on manual pre-registration followed by a genetic optimisation algorithm. A brief description of the pilot version of the method [8] has been given together with the results of a few initial tests. In this paper, we report on some new significant developments in this project. The critical issue of robustness against illumination changes is addressed and various colour representations and cost functions are tested and compared Natural constraints are introduced and experimentally validated to simplify the camera model and accelerate the algorithm. Finally, we present synthetic and real data with ground truth, apply the improved method to the data and measure the quality of the results.

关键词： Image processing

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disordered patterns projection for 3d motion recovering

Disordered patterns projection for 3D motion recovering

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

作者： Adán, A Molina, F Morena, L Univ Castilla La Mancha Dept Ingn Elect Electr & Automat E-13071 Ciudad Real Spain

ISBN: (纸本)0769522238

In this paper 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 is the code recovering phase is highly reduced since codewords are defined (is 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： Motion estimation

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Realistic models of children heads from 3d-MRI segmentation and tetrahedral mesh construction

Realistic models of children heads from 3D-MRI segmentation ...

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

作者： Burguet, J Gadi, N Bloch, I LTCI CNRS UMR 5141 Dept TSIEcole Natl Super Telecommun F-75013 Paris France

ISBN: (纸本)0769522238

In order to analyze the sensitivity of children to RF fields and mobile phones in particular, the SAR (Specific Absorption Ratio) defined as the power absorbed by a unit of mass of tissues (W/kg) should be computed based on a numerical model of the head. We propose to build realistic models from 3d-MRI of children heads. The method is composed of two steps. The first one consists in segmenting the main tissues in these images (skin, fat, muscles, cortical and marrow bones, cerebrospinal fluid, grey and white matter, blood, etc.). The segmentation is based on mathematical morphology methods which are well adapted to this aim and provide a robust and automatic method requiring minimum user intervention. Using simplified segmented images, the second step concerns the tetrahedral mesh generation. Our method uses almost regular meshes and topological tools to preserve the topological arrangement of the head tissues. A method to guarantee a good geometrical quality is also provided.

关键词： Brain imaging Mathematical morphology MRI segmentation Tetrahedral mesh Topological 3d labeling

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Small CPU times and fast interactivity in sonar seabottom surveys

Small CPU times and fast interactivity in sonar seabottom su...

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

作者： Loke, RE du Buf, JMH Univ Algarve Dept Elect & Comp Sci Vis Lab P-8000810 Faro Portugal

ISBN: (纸本)0769522238

Sonar profiling of the seabottom provide 3d data sets that can cover huge survey areas with many gaps. This paper describes a multiresolution framework or visualization pipeline that is being optimized for dealing with such data, taking into account both the CPU time and the user interactivity. This paper describes the techniques employed: (a) the construction of a quadtree that allows to eliminate gaps by interpolating available 3d data, (b) a first but coarse visualization at a high tree level in order to rapidly change or adjust the region of interest, and (c) a very efficient triangulation (mesh reduction) that allows for a fast interactivity even at the highest detail level. By using one single octree, all processing can be combined because (1) gaps can be filled by interpolation since they are smaller at higher tree levels, and (2) connected components can be projected down the tree and refined using the data available there. As a result, huge data sets can be visualized in near realtime on normally-sized discrete grids using shading instead of wire-frames, and this enables a fast searching for objects in the seabottom. Real CPU times are presented for a real sonar data set which is visualized at a low resolution, showing the overall shape of the seabottom, and at a high resolution, showing a (semi-)buried pipeline. In order to detect an object at such a high resolution additional techniques are applied to the data: (a) an interslice interpolation in order to cope with the increased data sparseness and (b) a maximum-homogeneity filtering in order to cope with the decreased signal-to-noise-ratio. After the extraction of the pipeline a thinning technique is applied in order to be able to quantify its length.

关键词： oceanic engineering sonar applications sonar imaging/ mapping sparse data volumetric interpretation volume visualization volumetric reconstruction multiresolution analysis interpolation segmentation surface fitting rendering

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3d reconstruction of natural scenes with view-adaptive multi-texturing

3D reconstruction of natural scenes with view-adaptive multi...

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

作者： Mueller, K Smolic, A Merkle, P Kaspar, B Eisert, P Wiegand, T Heinrich Hertz Inst Nachrichtentech Berlin GmbH Fraunhofer Inst Telecommun Image Proc Dept D-10587 Berlin Germany

ISBN: (纸本)0769522238

We present a 3d reconstruction and modeling system that operates on a number of input photographs that show a natural scene. Approaches from computer graphics and image processing are combined and performance is shown via experiments. Furthermore, reconstruction quality is analyzed w.r.t. the number and distribution of textures, used for reconstruction. The reconstruction pipeline starts with image acquisition, which consists of a number of photographs of the scene that are sequentially taken at different positions. Since the photographs are not acquired concurrently, they are influenced by different illumination conditions that we mandate to be preserved in the final 3d representation. In the second step, object segmentation is applied and camera calibration provided. This allows the application of shape-from-silhouette approaches, namely a hierarchical voxel approach, where different resolution layers are organized within an octree structure. For applying texture mapping, the voxel model is transformed into a wireframe, which provides smoothing of the object's surface and also reduces the number of surface primitives. Finally, a subset of original images is mapped onto the 3d geometry to provide texture information. Here, view-adaptive multi-texturing is used to preserve natural illumination. Intermediate views are interpolated automatically using adaptive real-time weight calculations for original textures.

关键词： Image reconstruction

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Local approximate 3d matching of proteins in viral cryo-EM density maps

Local approximate 3D matching of proteins in viral cryo-EM d...

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

作者： Burkhardt, S Fredriksson, K Ojamies, T Ravantti, J Ukkonen, E Max Planck Inst Comp Sci D-66123 Saarbrucken Germany

ISBN: (纸本)0769522238

Experimental structure analysis of biological molecules (e.g, proteins) or macromolecular complexes (e.g, viruses) can be used to generate three-dimensional density maps of these entities. Such a density map can be viewed as a three-dimensional gray-scale image where space is subdivided in voxels of a given size. The focus of this paper is the analysis of virus density maps. The hull of a virus consists of many copies of one or several different proteins. An important tool for the study of viruses is cryo-electron microscopy (cryo-EM), a technique with insufficient resolution to directly determine the arrangement of the proteins in the virus. We therefore created a tool that locates proteins in the three-dimensional density map of a virus. The goal is to fully determine the locations and orientations of the protein(s) in the virus given the virus' three-dimensional density map and a database of density maps of one or more protein candidates.

关键词： Proteins

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Fast and robust bore detection in range image data for industrial automation

Fast and robust bore detection in range image data for indus...

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

作者： Biegelbauer, G Vincze, M Vienna Tech Univ Automat & Control Inst A-1040 Vienna Austria

ISBN: (纸本)0769522238

This paper presents a fast and robust method to precisely segment and locate bore holes of 4 to 50mm diameter The task is solved by a robot moving a compact triangulation scanning sensor to all sides of the object and scanning the bore holes. Exploiting the knowledge about the expected bore diameter and bore pose makes it possible to develop highly robust algorithms for an industrial application. Sparse data of the bore hole is sufficient to segment the bore independent of bore hole chamfer type using a robust normal vector fit and a classification based on the Gaussian image. A sequential algorithm to fit the bore cylinder makes it possible to calculate the bore pose in less than 1 second. Experiments demonstrate that 120 degrees of the bore hole surface are sufficient for robust localization within 0.3mm and 0.5 degrees even in the presence of ghost points and notches in the bore holes.

关键词： Image analysis

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Speech-driven face synthesis from 3d video

Speech-driven face synthesis from 3D video

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

作者： Ypsilos, LA Hilton, A Turkmani, A Jackson, PJB Univ Surrey Ctr Vis Speech & Signal Proc Guildford GU2 7XH Surrey England

ISBN: (纸本)0769522238

This paper presents a framework for speech-driven synthesis of real faces from a corpus of 3d video of a person of dynamic 3d face shape and speaking. Video-rate capture of colour appearance provides the basis for a visual speech synthesis model. A displacement map representation combines face shape and colour into a 3d video. This representation is used to efficiently register and integrate shape and colour information captured from multiple views. To allow visual speech synthesis viseme primitives are identified from the corpus using automatic speech recognition. A novel non-rigid alignment algorithm is introduced to estimate dense correspondence between 3d face shape and appearance for different visemes. The registered displacement map representation together with a novel optical flow optimisation using both shape and colour enables accurate and efficient non-rigid alignment. Face synthesis from speech is performed by concatenation of the corresponding viseme sequence using the non-rigid correspondence to reproduce both 3d face shape and colour appearance. Concatenative synthesis reproduces both viseme timing and co-articulation. Face capture and synthesis has been perA formed for a database of 51 people. Results demonstrate A synthesis of 3d visual speech animation with a quality comA parable to the captured video of a person.

关键词： Face recognition

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