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检索条件"任意字段=3rd International Symposium on 3D Data Processing, Visualization, and Transmission, 3DPVT 2006"

共 148 条记录，以下是41-50 订阅

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Contour-based object detection in range images

Contour-based object detection in range images

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3rd international symposium on 3d data processing, visualization and transmission

作者： Stiene, Stefan Lingemann, Kai Nuechter, Andreas Hertzberg, Joachim Univ Osnabruck Knowledge Based Syst Res Grp Albrechtstr 28 D-49069 Osnabruck Germany

ISBN: (纸本)9780769528250

This paper presents a novel object recognition approach based on range images. due to its insensitivity to illumination, range data is well suited for reliable silhouette extraction. Silhouette or contour descriptions are good sources of information for object recognition. We propose a complete object recognition system, based on a 3d laser scanner reliable contour extraction with floor interpretation, feature extraction using a new, fast Eigen-CSS method, and a supervised learning algorithm. The recognition system was successfully tested on range images acquired with a mobile robot, and the results are compared to standard techniques, i.e., Geometric features, Hu and Zernike moments, the Border Signature method and the Angular Radial Transformation. An evaluation using the receiver operating characteristic analysis completes this paper The Eigen-CSS method has proved to be comparable in detection performance to the top competitors, yet faster than the best one by an order of magnitude in feature extraction time.

关键词： Object recognition

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3d reconstruction by gluing pair-wise euclidean reconstructions, or "How to achieve a good reconstruction from bad images"

3D reconstruction by gluing pair-wise euclidean reconstructi...

引用

3rd international symposium on 3d data processing, visualization and transmission

作者： Martinec, daniel Pajdla, Tomas Czech Tech Univ Ctr Machine Percept Dept Cybernet Fac Elect Engn Karlovo Nam13 Prague 12135 Czech Republic

ISBN: (纸本)9780769528250

This paper presents a new technique for estimating a multiview reconstruction given pair-wise Euclidean reconstructions up to rotations, translations and scales. The partial reconstructions are glued by the following three step procedure: (i) Camera rotations consistent with all reconstructions are estimated linearly. (ii) All the pair-wise reconstructions are modified according to the new rotations and refined by bundle adjustment while keeping the corresponding rotations same. (iii) The refined rotations are used to estimate both camera translations and 3d points using Second Order Cone Programming by minimizing the L-infinity-norm. We introduce a new criterion for evaluating importance of an epipolar geometry in influence on the overall 3d geometry. The estimated importance is used to reweight data in the above algorithm to better handle unequiponderantly captured images. The performance of the proposed method is demonstrated on difficult wide base-line image sets.

关键词： Rotation

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A 3d outdoor scene scanner based on a night-vision range-gated active imaging system

A 3D outdoor scene scanner based on a night-vision range-gat...

引用

3rd international symposium on 3d data processing, visualization and transmission

作者： Monnin, david Schneider, Armin L. Christnacher, Frank Lutz, Yves French German Res Inst St Louis 5Rue Gen Cassagnou F-68301 St Louis France

ISBN: (纸本)9780769528250

We present a 3d outdoor scene scanner for the acquisition of kilometers-deep scenes in night conditions. Its imaging system is based on a compact and low-cost pulsed laser illuminator and a light-intensifier equipped CCd camera. By precisely synchronizing both the illuminator and the camera shutter it is possible to acquire "slices" of the scene at specific known distances. We show that even with large laser pulses and without megahertz-capable electronics, the third dimension can be recovered for the whole range of the scene by processing only two images acquired in specific conditions. As the pixel intensities of the images produced by active imaging systems vary with the square of the range, and due to the limited dynamics of image sensors, scanning long-range scenes with shorter "slices" allows the camera gain to be adjusted with respect to the range and the accuracy to be enhanced. The imaging system as well as the different image processing steps are detailed in this paper and an example of typical results is given.

关键词： Imaging systems

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distortion-Sensitive Synthesis of Texture and Geometry in Interactive 3d visualization

Distortion-Sensitive Synthesis of Texture and Geometry in In...

引用

international symposium on 3d data processing visualization and transmission

作者： Nicola Brusco Pietro Zanuttigh david Taubman Guido Maria Cortelazzo University of New South Wales Sydney Australia Università di Padova Padova Italy

This paper addresses the problem of remote browsing of 3d scenes. Texture and geometry information are both available at server side in the form of scalably compressed images and depth maps. We propose a framework for the dynamic allocation of the available transmission resources between geometry and texture. Both the transmission of new images and the improvement of the already transmitted ones are taken into account. We also introduce a novel strategy for distortion-sensitive synthesis of both geometry and rendered imagery at client side.

关键词： visualization Image coding Layout Rendering (computer graphics) Information geometry Solid modeling Resource management Geometrical optics Australia Computational geometry

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The reverse projection correlation principle for depth from defocus

The reverse projection correlation principle for depth from ...

引用

3rd international symposium on 3d data processing, visualization and transmission

作者： McCloskey, Scott Langer, Michael Siddiqi, Kaleem McGill Univ Ctr Intelligent Machines Montreal PQ H3A 2A7 Canada

ISBN: (纸本)9780769528250

In this paper, we address the problem of finding depth from defocus in a fundamentally new way. Most previous methods have used an approximate model in which blurring is shift invariant and pixel area is negligible. Our model avoids these assumptions. We consider the area in the scene whose radiance is recorded by a pixel on the sensor and relate the size and shape of that area to the scene's position with respect to the plane of focus. This is the notion of reverse projection, which allows us to illustrate that, when out of focus, neighboring pixels will record light from overlapping regions in the scene. This overlap results in a measurable change in the correlation between the pixels' intensity values. We demonstrate that this relationship can be characterized in such a way as to recover depth from defocused images. Experimental results show the ability of this relationship to accurately predict depth from correlation measurements.

关键词： Pixels

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Automatic 3d face detection, normalization and recognition

Automatic 3D face detection, normalization and recognition

引用

3rd international symposium on 3d data processing, visualization and transmission

作者： Mian, Ajmal Bennamoun, Mohammed Owens, Robyn Univ Western Australia Sch Comp Sci & Software Engn 35 Stirling Highway Crawley WA 6009 Australia

ISBN: (纸本)9780769528250

A fully automatic 3d face recognition algorithm is presented. Several novelties are introduced to make the recognition robust to facial expressions and efficient. These novelties include: (1) Automatic 3d face detection by detecting the nose;(2) Automatic pose correction and normalization of the 3d face as well as its corresponding 2d face using the Hotelling Transform;(3) A Spherical Face Representation and its use as a rejection classifier to quickly reject a large number of candidate faces for efficient recognition;and (4) Robustness to facial expressions by automatically segmenting the face into expression sensitive and insensitive regions. Experiments performed on the FRGC Ver 2.0 dataset (9,500 2d/3d faces) show that our algorithm outperforms existing 3d recognition algorithms. We achieved verification rates of 99.47% and 94.09% at 0.001 FAR and identification rates of 98.03% and 89.25% for probes with neutral and non-neutral expression respectively.

关键词： Face recognition

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3d skeleton-based body pose recovery

3D skeleton-based body pose recovery

引用

3rd international symposium on 3d data processing, visualization and transmission

作者： Menier, Clement Boyer, Emond Raffin, Bruno INRIA Rhone Alpes GRAVIR 655 Ave Europe F-38334 Saint Ismier France

ISBN: (纸本)9780769528250

This paper presents an approach to recover body motions from multiple views using a 3d skeletal model. It takes, as input, foreground silhouette sequences from multiple viewpoints, and computes, for each frame, the skeleton pose which best fit the body pose. Skeletal models encode mostly motion information and allows therefore to separate motion estimation from shape estimation for which solutions exist;And focusing on motion parameters significantly reduces the dependancy on specific body shapes, yielding thus more flexible solutions for body motion capture. However, a problem generally faced with skeletal models is to find adequate measurements with which to fit the model. In this paper, we propose to use the medial axis of the body shape to this purpose. Such medial axis can be estimated from the visual hull, a shape approximation which is easily obtained from the silhouette information. Experiments show that this approach is robust to several perturbations in the model or in the input data, and also allows fast body motions or, equivalently, important motions between consecutive frames.

关键词： Motion estimation

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Motion editing in 3d video database

Motion editing in 3D video database

引用

3rd international symposium on 3d data processing, visualization and transmission

作者： Xu, Jianfeng Yamasaki, Toshihiko Aizawa, Kiyoharu Univ Tokyo Dept Elect Engn Kashiwa Chiba 2778561 Japan Univ Tokyo Dept Frontier Informat Tokyo Japan

ISBN: (纸本)9780769528250

As the next generation of media, 3d video is attracting increased attention. 3d video is a sequence of three dimensional mesh models, captured and generated for a real dynamic object. In this paper, we present a simple framework of motion editing in 3d video database to re-use 3d video data. Our system is composed of two modules. In the first module, a motion database is automatically set up from original 3d video sequences off-line by analyzing the feature vectors of each frame. It is observed that our original 3d video sequences have a two-level temporal structure. A fine-to-coarse method is proposed to extract such a structure. 3d video is segmented into the fine-level structure by a three reference frame strategy and then is clustered into the coarse-level structure. In the second module, users can synthesize the motions to edit a new 3d video sequence online. A cost function is optimized to transit between two motions with the users' requirements. All the algorithms in the system are based on the analysis in feature vector space and the edited 3d video sequence is played using OpenGL.

关键词： Cost functions

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Illumination insensitive model-based 3d object tracking and texture refinement

Illumination insensitive model-based 3D object tracking and ...

引用

3rd international symposium on 3d data processing, visualization and transmission

作者： Yang, Hua Welch, Greg Pollefeys, Marc Univ N Carolina Dept Comp Sci Chapel Hill NC 27599 USA

ISBN: (纸本)9780769528250

A common approach to model-based tracking is to use a model of the object to predict what will be observed, and then to compare that with real observations. For methods that make use of the object's photometric properties (appearance) in their measurements, illumination inconsistencies between the modeled and actual scene can cause tracking problems. In this paper we address one case: model-based tracking of Lambertian objects under directional light sources. We present an iterative optimization method that uses a Kalman filter to simultaneously refine estimates of the object motion, the illumination, and the model texture. We model the illumination variance between the real and predicted observation using the intensity ratios of corresponding surface points, which we then use to make model-based image predictions consistent with the real lighting. To demonstrate the effectiveness of our method we present experimental results using both synthetic (controlled) and real image sequences.

关键词： Light sources

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Reconstructing a 3d line from a single catadioptric image

Reconstructing a 3D line from a single catadioptric image

引用

3rd international symposium on 3d data processing, visualization and transmission

作者： Lanman, douglas Wachs, Megan Taubin, Gabriel Cukierman, Fernando Brown Univ Providence RI 02912 USA Stanford Univ Stanford CA 94305 USA Univ Buenos Aires RA-1053 Buenos Aires DF Argentina

ISBN: (纸本)9780769528250

This paper demonstrates that, for axial non-central optical systems, the equation of a 3d line can be estimated using only four points extracted from a single image of the line. This result, which is a direct consequence of the lack of vantage point, follows from a classic result in enumerative geometry: there are exactly two lines in 3-space which intersect four given lines in general position. We present a simple algorithm to reconstruct the equation of a 3d line from four image points. This algorithm is based on computing the Singular Value decomposition (SVd) of the matrix of Plucker coordinates of the four corresponding rays. We evaluate the conditions for which the reconstruction fails, such as when the four rays are nearly coplanar Preliminary experimental results using a spherical catadioptric camera are presented. We conclude by discussing the limitations imposed by poor calibration and numerical errors on the proposed reconstruction algorithm.

关键词： Singular value decomposition

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