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Interactive walkthroughs using "morphable 3d-mosaics

Interactive walkthroughs using "morphable 3D-mosaics

引用

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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Automatic registration method for frontal 3d face

Automatic registration method for frontal 3D face

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3rd IEEE international symposium on Control, Communications and Signal processing (ISCCSP 2008)

作者： Tang, X. M. Moon, Y. S. Chinese Univ Hong Kong Dept Comp Sci & Engn Hong Kong Hong Kong Peoples R China

ISBN: (纸本)9781424416875

Three-dimensional face registration is a critical step in 3d face recognition. This paper presents an automatic registration method for frontal 3d face data. In our method, a unified coordinate system is created for each face according to the spatial relationships among its Symmetry Plane, nose tip point and nose bridge point. For evaluating the performance of our registration method, manually marked fiducial points are used for comparison. Extensive localization displacement and face verification experiments have been performed on the FRGC benchmark 3d face dataset to evaluate the accuracy and robustness of the proposed automatic registration method. Preliminary experiment results show that this approach can yield very accurate registration results with least human intervention. ©2008 IEEE.

关键词： three-dimensional face registration Symmetry plane nose tip nose bridge

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A unified representation for interactive 3d modeling

A unified representation for interactive 3D modeling

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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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Applications of 3d medical imaging in orthopaedic surgery: Introducing the Hip-Op system 1

Applications of 3D medical imaging in orthopaedic surgery: I...

引用

1st international symposium on 3d data processing visualization and transmission

作者： Lattanzi, R Viceconti, M Petrone, M Quadrani, P Zannoni, C Ist Ortoped Rizzoli Lab Tecnol Med Bologna Italy

ISBN: (纸本)0769515215;0769515223

Computer Aided Surgery (CAS) systems help surgeons in planning the operation accurately, resulting in costs reducing, clinical outcome improving and enhancing of the health care delivery efficiency. This paper describes the Hip-Op system, which is a novel software for the preoperative planning of total hip replacement. The software uses a fully, three-dimensional (3d) internal representation of the patient anatomy, derived from Computed Tomography data, The user interface is based on an innovative visualization paradigm, called Multimodal display, and represents the anatomical objects by means of multiple views, which are familiar to medical professionals. Besides the original CT slices, also two synthetically generated radiographs are available, as well as a surface rendering view The surgeon can load prosthetic models into the planning software environment, selecting them from those available in the implant database. Then he can perform a virtual surgery procedure in order to plan the proper position and orientation of the prosthesis within the host femur Analysis modules a low to evaluate the planning from a biomechanical point of view. Hip-Op version 1.3 is currently available as freeware at .

关键词： Medical imaging

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A hierarchy of cameras for 3d photography 1

A hierarchy of cameras for 3D photography

引用

1st international symposium on 3d data processing visualization and transmission

作者： Neumann, J Fermüller, C Aloimonos, Y Univ Maryland Ctr Automat Res College Pk MD 20742 USA

ISBN: (纸本)0769515215;0769515223

We investigate the relationship between camera design and 3d photography, by examining the influence of camera design on the estimation of the motion and structure of a scene from video data. To compute the 3d structure of a scene accurately from a moving vision sensor, we need to be able to estimate the motion of the sensor from the recorded image information, a problem that has been well-studied. By relating the differential structure of the time varying plenoptic function to different known and new camera designs, we can establish a hierarchy of cameras based upon the stability and complexity of the computations necessary to estimate structure and motion. At the low end of this hierarchy is the standard planar pinhole camera for which the structure from motion problem is non-linear and ill-posed. At the high end is a camera, which we call the full field of view polydioptric camera, for which the problem is linear and stable. In between are multiple view cameras with a large field of view which we have built, as well as omni-directional sensors. We develop design suggestions for a polydioptric camera especially suited for 3d photography, and we propose a linear algorithm utilizing this camera design to recover the structure of the scene.

关键词： 3d photography motion estimation structure from motion plenoptic function

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3d strain estimation of soft biological tissues based on a constrained minimization strategy

3D strain estimation of soft biological tissues based on a c...

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3rd IEEE international symposium on Biomedical Imaging

作者： deprez, Jean-Francois Brusseau, Elisabeth Gehin, Claudine dittmar, Andre Basset, Olivier Univ Lyon 1 INSA Lyon CNRSINSERM U630 CREATISUMR 5515 F-69365 Lyon France CNRS LPM MMB UMR 5511 F-69365 Lyon France

ISBN: (纸本)9780780395763

The aim of this study is the estimation of the three dimensional strain occurring in soft biological tissues under compressive forces, through the processing of radiofrequency ultrasound volumes. This work is one of the first attempts to deal with the 3d problem of tissue motion under load. In this article, we propose a new adaptive and iterative numerical model, allowing full-resolved strain parameters estimation. This model is based on an objective function minimization with linear inequalities constraints. An original technique of adaptive displacement of the region of study is also considered. Preliminary tests are performed on a volume of ultrasound data obtained from a 3d numerical phantom. Axial, lateral, and elevational displacements and axial strain fields are estimated, and compared with the theory.

关键词： Tissue

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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...

引用

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

引用

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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Efficient algorithm fo the computation of 3d Fourier descriptors 1

Efficient algorithm fo the computation of 3D Fourier descrip...

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1st international symposium on 3d data processing visualization and transmission, 3dPVT 2002

作者： Sijbers, J. Van dyck, d. Vision Lab. University of Antwerp Groenenborgerlaan 171 U312 AntwerpB-2020 Belgium

ISBN: (纸本)0769515215

This work describes a new approach for the computation of 3d Fourier descriptors, which are used for characterization, classification, and recognition of 3d objects. The method starts with a polygonization of the object's surface. Next, a progressive mesh is constructed from the polyhedron using quadric-based polygonal surface simplification. Then, the same progressive mesh is exploited to efficiently reconstruct the original polyhedron onto the surface of a sphere, which is a necessary step for the computation of 3d Fourier descriptors. The mapping method is shown to be efficient and fast in projecting an arbitrarily shaped polyhedron onto a sphere surface. © 2002 IEEE.

关键词： Computational efficiency

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Multiresolution distance volumes for progressive surface compression 1

Multiresolution distance volumes for progressive surface com...

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1st international symposium on 3d data processing visualization and transmission

作者： Laney, d Bertram, M duchaineau, M Max, N Univ Calif Davis Dept Appl Sci Davis CA 95616 USA

ISBN: (纸本)0769515215;0769515223

We present a surface compression method that stores surfaces as wavelet-compressed signed-distance volumes. Our approach enables the representation of surfaces with complex topology and arbitrary numbers of components within a single multiresolution data structure. This data structure elegantly handles topological modification at high compression rates. Our method does not require the costly and sometimes infeasible base mesh construction step required by subdivision surface approaches, We present several improvements over previous attempts at compressing signed-distance functions, including an O(n) distance transform, a zero set initialization method for triangle meshes, and a specialized thresholding algorithm. We demonstrate the potential of sampled distance volumes for surface compression and progressive reconstruction for complex high genus surfaces.

关键词： data structures

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