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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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3d performance capture for facial animation

3D performance capture for facial animation

引用

international symposium on 3d data processing visualization and transmission

作者： d.M. Vicar S. Ford E. Borland R. Rixon J. Patterson P. Cockshott Dept. Computing Science The University of Glasgow U.K.

This work describes how a photogrammetry based 3d capture system can be used as an input device for animation. The 3d dynamic Capture System is used to capture the motion of a human face, which is extracted from a sequence of 3d models captured at TV frame rate. Initially the positions of a set of landmarks on the face are extracted. These landmarks are then used to provide motion data in two different ways. First, a high level description of the movements is extracted, and these can be used as input to a procedural animation package (i.e. CreaToon). Second the landmarks can be used as registration points for a conformation process where the model to be animated is modified to match the captured model. This approach gives a new sequence of models, which have the structure of the drawn model but the movement of the captured sequence.

关键词： Facial animation Cameras data mining Financial advantage program Humans Head Motion analysis MPEG 4 Standard Frequency Face

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Topology and geometry of unorganized point clouds

Topology and geometry of unorganized point clouds

引用

international symposium on 3d data processing visualization and transmission

作者： G. Kamberov G. Kamberova Department of Computer Science Stevens Institute of Technology Hoboken NJ USA Department of Computer Science Stevens Institute of Technology Hoboken NY USA

We present a new method for defining neighborhoods, and assigning principal curvature frames, and mean and Gauss curvatures to the points of an unorganized oriented point-cloud. The neighborhoods are estimated by measuring implicitly the surface distance between points. The 3d shape recovery is based on conformal geometry, works directly on the cloud, does not rely on the generation of polygonal, or smooth models. Test results on publicly available synthetic data, as ground truth, demonstrate that the method compares favorably to the established approaches for quantitative 3d shape recovery. The proposed method is developed to serve applications involving point based rendering and reliable extraction of differential properties from noisy unorganized point-clouds.

关键词： Topology Geometry Clouds Gaussian processes data mining Computer vision Surface fitting Shape Computer graphics Computer science

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3d image sensing for bit plane method of progressive transmission

3D image sensing for bit plane method of progressive transmi...

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international symposium on 3d data processing visualization and transmission

作者： d. Loganathan K.M. Mehata Department of Computer Science and Engineering College of Engineering Guindy Anna University Chennai India

Image compression has received a lot of interest over the years. Almost all the compression algorithms and standards, discussed in literature, gather statistics and compress on the complete image and compresses to suit various requirements such as lossy / lossless, baseline/ progressive, spatial, region on interest. Natural images such as gray scale images and color images are best compressed in the existing literature based on the local and global properties such as attributes of constituent pixels of the given image. In this paper, it is proposed to quantize the amplitudes of pixel values to form a number of bit planes and these bit planes are transmitted in either lossy, lossless, progressive manner. Bit plane formation is attempted from the image acquiring stage to compress and then to transmission stage. Results obtained are promising and give rise to new method or ideology in image sensing, acquiring, storage and transmission.

关键词： Image coding Satellites Image sensors Transform coding Pixel Voltage Propagation losses Image storage Earth Sensor phenomena and characterization

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Face recognition from 3d data using Iterative Closest Point algorithm and Gaussian mixture models

Face recognition from 3D data using Iterative Closest Point ...

引用

international symposium on 3d data processing visualization and transmission

作者： J. Cook V. Chandran S. Sridharan C. Fookes Image and Video Research Laboratory Queensland University of Technology Brisbane QLD Australia

An approach to face verification from 3d data is presented. The method uses 3d registration techniques designed to work with resolution levels typical of the irregular point cloud representations provided by structured light scanning. Preprocessing using a-priori information of the human face and the Iterative Closest Point algorithm are employed to establish correspondence between test and target and to compensate for the nonrigid nature of the surfaces. Statistical modelling in the form of Gaussian mixture models is used to parameterise the distribution of errors in facial surfaces after registration and is employed to differentiate between intra- and extra-personal comparison of range images. An equal error rate of 2.67% was achieved on the 30 subject manual subset of the 3d/spl ***/rma database.

关键词： Face recognition Iterative closest point algorithm Humans Testing Laser modes Laser sintering Shape Support vector machines Support vector machine classification Iterative algorithms

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A non causal Bayesian framework for object tracking and occlusion handling for the synthesis of stereoscopic video

A non causal Bayesian framework for object tracking and occl...

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international symposium on 3d data processing visualization and transmission

作者： K. Moustakas d. Tzovaras M.G. Strintzis Informatics and Telematics Institute Thessaloniki Greece Aristotle University of Thessaloniki Thessaloniki Greece

This work presents a framework for the synthesis of stereoscopic video using as input only a monoscopic image sequence. Initially, bi-directional 2d motion estimation is performed, which is followed by an efficient method for the reliable tracking of object contours. Rigid 3d motion and structure is recovered utilizing extended Kalman filtering. Finally, occlusions are dealt with a novel Bayesian framework, which exploits future information to correctly reconstruct occluded areas. Experimental evaluation shows that the layered object scene representation, combined with the proposed methods for object tracking throughout the sequence and occlusion handling, yields very accurate results.

关键词： Bayesian methods Layout Image sequences Motion estimation Bidirectional control Tracking Image reconstruction Image converters Image motion analysis Interpolation

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Scalable and efficient coding of 3d model extracted from a video

Scalable and efficient coding of 3D model extracted from a v...

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international symposium on 3d data processing visualization and transmission

作者： R. Balter P. Gioia L. Morin F. Galpin IRISA/INRIA Rennes France FRANCE TELECOM R & D Cesson-Sevigne France

This work presents an efficient and scalable coding scheme for transmitting a stream of 3d models extracted from a video. As in classical model-based video coding, the geometry, connectivity, and texture of the 3d models have to be transmitted, as well as the camera position for each frame in the original video. The proposed method is based on exploiting the interrelations existing between each type of information, instead of coding them independently, allowing a better prediction of the next 3d model in the stream. Scalability is achieved through the use of wavelet-based representations for both texture and geometry of the models. A consistent connectivity is built for all 3d models extracted from the video sequence, which allows a more compact representation and straightforward geometric morphing between successive models. Furthermore this leads to a consistent wavelet decomposition for 3d models in the stream. Quantitative and qualitative results for the proposed scheme are compared with the state of the art video coder H264, 3d model-based Galpin coder and independent MPEG4-based coding of the information. Targeted applications include distant visualization of the original video at very low bit-rate and interactive navigation in the extracted 3d scene on heterogeneous terminals.

关键词： Solid modeling Streaming media data mining Geometry Video coding Cameras Predictive models Scalability Video sequences visualization

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View dependence of 3d recovery from folded pictures and warped 3d faces

View dependence of 3D recovery from folded pictures and warp...

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international symposium on 3d data processing visualization and transmission

作者： P. Cavanagh M. von Grunau L. Zimmerman Department of Psychology Harvard University Cambridge MA USA Department of Psychology Concordia University Montreal QUE Canada Department of Electrical and Computer Engineering University of Minnesota Duluth MN USA

In a popular visual illusion, the portrait on paper currency is folded into an M shape along vertical lines through the nose and the eyes. When this folded picture is tilted back and forth horizontally the face undergoes striking changes in expression. This distortion reveals two insights concerning 3d representation in the human visual system and we have explored these with experiments on simple schematic faces and observations on distortions of laser range images of faces. The observations show first that when recovering depicted depth, pictorial cues are interpreted independently of binocular depth information and second, that the recovery of facial expression is based on a scaled prototypical face structure.

关键词： Shape Psychology Visual system Face Nose Eyes Humans Laser noise Prototypes Solids

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Feature based registration of range images for mapping of natural outdoor environments

Feature based registration of range images for mapping of na...

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international symposium on 3d data processing visualization and transmission

作者： P. Forsman A. Halme Automation Technology Laboratory Helsinki University of Technology Finland

Challenges related to viewpoint registration in rough forest terrain can be quite different compared to those faced in structured environments. Maneuvring the sensor between measurement positions introduces large error into the a priori estimates of the registration coordinates. As a consequence, locally optimal registration methods may not work properly. Moreover, due to the clutter, the scene contents can change substantially even due to a relative small displacement of the sensor. Often, the sensor has to be moved to the other side of the target object, such as a group of trees, to get a good coverage of its geometry. In both cases, overlap between the two 3d data sets will be minimal ruling out conventional registration methods. In this paper, a feature-based method for registering 3d range scans for mapping natural outdoor environments is proposed. The method utilizes cylindrical, rotation symmetric features extracted from the 3d measurement data for viewpoint registration. The method is tested on real range images.

关键词： Position measurement data mining Layout Image segmentation Geometry Laser radar Cameras Testing Terrain mapping Automation

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Acquisition, modelling and rendering of very large urban environments

Acquisition, modelling and rendering of very large urban env...

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international symposium on 3d data processing visualization and transmission

作者： G. Bostrom M. Fiocco d. Puig A. Rossini J.G.M. Goncalves V. Sequeira European Commission Joint Research Centre Ispra Varese Italy

We describe a vehicle borne data acquisition system for urban environments and associated 3d data management and interactive rendering software. The data acquisition system is capable of acquiring 3d data from urban areas with centimetre resolution including automatic capturing of colour. The system includes a management and interactive rendering software which is designed to cope with the huge quantities of data generated by the acquisition system. It uses out-of-core preprocessing to transform data into octrees. Real-time interactive rendering is achieved by using novel techniques such as front-to-back octree traversal, occlusion query and speculative prefetching. The paper presents the results of the described techniques applied to large public areas including the City Centre of Verona, Italy.

关键词： data acquisition Vehicles Computer graphics Urban areas Cities and towns Laser modes Toy industry Urban planning Hardware Global Positioning System

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Thickness histogram and statistical harmonic representation for 3d model retrieval

Thickness histogram and statistical harmonic representation ...

引用

international symposium on 3d data processing visualization and transmission

作者： Yi Liu Jiantao Pu Hongbin Zha W. Liu Y. Uehara National Laboratory on Machine Perception Peking University Beijing China Internet Application Laboratory Language Processing Laboratory Fujitsu Research and Development Center Company Limited Japan Media Laboratory Fujitsu Laboratories Limited Japan

Similarity measuring is a key problem for 3d model retrieval. 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.

关键词： Histograms Shape Robustness Feature extraction Principal component analysis Laboratories Frequency Geometry Solid modeling Internet

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