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Hardware accelerated image-based rendering with compressed surface light fields and multiresolution geometry

6th Pacific-Rim conference on Multimedia (PCM 2005)

作者： Kitahara, M Shimizu, S Kamikura, K Yoshiyuki, Y NTT Corp NTT Cyber Space Labs Yokosuka Kanagawa 2390847 Japan

ISBN: (纸本)3540300279

Surface Light;Fields(SLF) are light fields parameterized to the surface of a geometric model. Past research in this area has explored the use of parameterization of aquired geometric model to the base mesh, in the context of rendering from compressed representation of the SLF. We further extend this aproach to enable hardware-accelerated SLF rendering. We show that our aproach enables hardware-accelerated, scalable rendering with commodity graphics hardware.

关键词： image analysis

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Generation of geometrical objects by iterative method

Generation of geometrical objects by iterative method

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15th International conference on computer graphics and vision, GraphiCon 2005

作者： Kim, Pavel A. Image processing laboratory Institute of Computational Mathematics and Mathematical Geophysics SB RAS 6 Lavrentiev ave. 630090 Novosibirsk Russia

Visualization of digital models of the objects forming a visual scene, is usually carried out on the basis of the conforming mathematical model describing a locating of objects in space with the help of the cartesian coordinates. thus scene structure determination assumes besides knowledge of coordinates of its elements, as well others essential to positioning objects parameters, such as for example, transparency/opacity, visibility /invisibility etc. On photogrammetric image processing experience it is possible, in particular, to note nine orientation parameters which are necessary for reception of results. Happens, that some part of the information appears missed, and in this case reconstruction of a scene becomes caused by some merely formalizable actions. the certain analogy to the described situation takes place in some algorithms for image processing, for example, in algorithm for object border detecting when the border of object is indicated by the description of properties of a locality of points of scene, without binding them to concrete object or its elements. It is interesting, that the border of object may be marked as a set of the points forming a geometrical figure, and thus algorithm don't know anything about own properties of this figure. It is possible to formation border as habitual marked object by means of vectorization the constructed sequence of points, i.e. the direct indication of frame as a sequence of the ?artesian coordinates of forming points. the approach to the geometrical constructions that changes a role of points coordinates is considered. It is based on geometrical principles at which, the main platform for geometrical constructions are concept of the neighbourhood between points of a scene. then the opportunity of storage of concomitant information in each point and transferring common advanced information between the next points. Operating by such space assumes presence of suitable device as which the vertical data presentation ad

关键词： Pixels

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Specular removal using CL-projection

Specular removal using CL-projection

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6th Pacific Rim conference on Multimedia - Advances in Mulitmedia Information processing - PCM 2005

作者： Park, Joung Wook Yoo, Jae Doug Lee, Kwan H. Intelligent Design and Graphics Laboratory Department of Mechatronics 1 Oryong-dong Buk-gu Gwangju 500-712 Korea Republic of

ISBN: (纸本)3540300406

In this paper we propose a method to remove the specularity of an image using Color Line(CL)-projection. CL-projection is defined as the projection along the direction of color line. In the first step of the proposed procedure, the highlighted region in an image is estimated from two images captured with different camera exposure times. In the second step, the representative color of the neighborhood of each highlighted region is estimated. In the final step, the specular component of color in the neighborhood region is removed using CL-projection and then the highlight is inpainted to recover the original color using a distance transform. © Springer-Verlag Berlin Heidelberg 2005.

关键词： image analysis

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A stratification-based approach to accurate and fast image annotation

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6th International conference on Web -Age Informational Management

作者： Ye, JY Zhou, XD Pei, J Chen, L Zhang, L Fudan Univ Dept Comp & Informat Technol Shanghai 200433 Peoples R China Simon Fraser Univ Sch Comp Sci Burnaby BC V5A 1S6 Canada

ISBN: (纸本)3540292276

image annotation is an important research problem in content-based image retrieval (CBIR) and computer vision with broad applications. A. major challenge is the so-called "semantic gap" between the low-level visual features and the high-level semantic concepts. It is difficult to effectively annotate and extract semantic concepts from an image. In an image with multiple semantic concepts, different objects corresponding to different concepts may often appear in different parts of the image. If we can properly partition the image into regions, it is likely that the semantic concepts are better represented in the regions and thus the annotation of the image as a whole can be more accurate. Motivated by this observation, in this paper we develop a novel stratification-based approach to image annotation. First, an image is segmented into some likely meaningful regions. Each region is represented by a set of discretized visual features. A naive Bayesian method is proposed to model the relationship between the discrete visual features and the semantic concepts. the topic-concept distribution and the significance of the regions in the image are also considered. An extensive experimental study using real data sets shows that our method significantly outperforms many traditional methods. It is comparable to the state-of-the-art Continuous-space Relevance Model in accuracy, but is much more efficient - it is over 200 times faster in our experiments.

关键词： image processing

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Haptic interaction with depth video media

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6th Pacific Rim conference on Multimedia - Advances in Mulitmedia Information processing - PCM 2005

作者： Cha, Jongeun Kim, Seung-Man Oakley, Ian Ryu, Jeha Lee, Kwan H. Human-Machine-Computer Interface Lab. Dept. of Mechatronics Gwangju Institute of Science and Technology 1 Oryong-dong Buk-gu Gwangju 500-712 Korea Republic of Intelligent Design and Graphics Lab. Dept. of Mechatronics

ISBN: (纸本)3540300279

In this paper we propose a touch enabled video player system. A conventional video player only allows viewers to passively experience visual and audio media. In virtual environment, touch or haptic interaction has been shown to convey a powerful illusion of the tangible nature - the reality - of the displayed environments and we feel the same benefits may be conferred to a broadcast, viewing domain. To this end, this paper describes a system that uses a video representation based on depth images to add a haptic component to an audio-visual stream. We generate this stream through the combination of a regular RGB image and a synchronized depth image composed of per-pixel depth-from-camera information. the depth video, a unified stream of the color and depth images, can be synthesized from a computer graphics animation by rendering with commercial packages or captured from a real environment by using a active depth camera such as the Zcam™. In order to provide a haptic representation of this data, we propose a modified proxy graph algorithm for depth video streams. the modified proxy graph algorithm can (i) detect collisions between a moving virtual proxy and time-varying video scenes, (ii) generates smooth touch sensation by handling the implications of the radically different display update rates required by visual (30Hz) and haptic systems (in the order of 1000Hz), (iii) avoid sudden change of contact forces. A sample experiment shows the effectiveness of the proposed system. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Video signal processing

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Registration of brain MR images using feature information of structural elements

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6th Pacific Rim conference on Multimedia - Advances in Mulitmedia Information processing - PCM 2005

作者： Chae, Jeong-Sook Cho, Hyung-Jea Korea Republic of Computer Vision and Multimedia Lab. Department of Computer Engineering Dongguk University Korea Republic of

ISBN: (纸本)3540300279

In this paper, we propose a new registration algorithm, which can provide more exact criteria for deciphering brain diseases. At the first stage, our algorithm divides the areas of the brain structures to extract their features. After calculating contour and area information, the grouping step is performed. At the next stage, the brain structures are precisely classified with respect to the shape of cerebrospinal fluid and the volume of brain structures. these features are finally integrated into a knowledge base to build up a new standard atlas for normal brain MR images. Using this standard atlas, we perform the registration process after extracting the brain structures from the MR image to be compared. Finally, we analyze the registration results of the normal and abnormal MR images, and showed that the exactness of our algorithm is relatively superior to the previous methods. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Medical imaging

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Generation of 3D building model using 3D line detection scheme based on line fitting of elevation data

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6th Pacific Rim conference on Multimedia - Advances in Mulitmedia Information processing - PCM 2005

作者： Woo, Dong-Min Han, Seung-Soo Jung, Young-Kee Lee, Kyu-Won Information Engineering Department Myongji University Gyeonggido 449-728 Korea Republic of Computer Engineering Department Honam University Gwangju 506-090 Korea Republic of Computer Engineering Department Daejun University Daejun 300-716 Korea Republic of

ISBN: (纸本)3540300279

this paper presents a new 3D line segment extraction method, which can be used in generating 3D rooftop model. the core of our method is that 3D line segment is extracted by using line fitting of elevation data on 2D line coordinates of ortho-image. In order to use elevation in line fitting, the elevation itself should be reliable. To measure the reliability of elevation, in this paper, we employ the concept of self-consistency. We test the effectiveness of the proposed method with a quantitative accuracy analysis using synthetic images generated from Avenches data set of Ascona aerial images. Experimental results indicate that our method generates 3D line segments almost 10 times more accurate than raw elevations obtained by area-based method. Also, our proposed method shows much improved accuracy over the cooperative hybrid stereo method. Using a simple 3D line grouping scheme, 3D line segments are shown to generate a precise 3D building model effectively. © Springer-Verlag Berlin Heidelberg 2005.

关键词： three dimensional computer graphics

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Layered image Warping with Post-texture Model

Layered Image Warping with Post-texture Model

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Asian Simulation conference/the 6th International conference on system Simulation and Scientific Computing

作者： TANG Yang, MA Wenjun, WU Huizhong, XIAO Liang (Department of computer Science &Technology, Nanjing University of Science and Technology, Nanjing 210094,China Department of computer Science,University of Alabama in Huntsville,301 Sparkman Road, A1, 35805,USA)

image warping is one of the basic algorithms of image-based rendering. To eliminate the visual errors and reduce the redundant computations of traditional methods, a novel post-texture image warping model is proposed which mainly include equal-density mapping and texture reconstruction. With the new model, a layered image mapping (LIW) approach is proposed then. In LIW, reference pixels are firstly mapped to "equal density layers" which parallel the desired view and are stored in a bidirectional link list after some by-layer processing. By implementing texture rendering along the list eventually, the warping is transformed to a fast texture mapping process, which provides a considerable speedup. LIW is proved to be efficiently and effective by experiments.

关键词： image warping image-based rendering computer graphics virtual reality

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Automated delineation of regions of interest through adaptive segmentation and interpretation of images in view of dimensional evaluation of manufactured parts

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JOURNAL OF ELECTRONIC IMAGING 2004年第3期13卷 462-473页

作者： Lallement, A Khemmar, R Hirsch, E Univ Strasbourg 1 Ecole Natl Super Phys Strasbourg Lab Sci Image Informat & Teledetect CNRSUMR 7005 F-67412 Illkirch Graffenstaden France

Industrial applications of computer vision, such as dimensional inspection, require, among other things, making automated procedures available for the analysis of gray-level image to derive application-dependent 3-D descriptions of their contents. In view of the quantitative 3-D reconstruction of an imaged object and to fully automate the evaluation process, we describe two segmentation and interpretation methods for the automated delineation of regions of interest belonging to the object and associated with free-form surfaces. the selection of the procedure to apply, either a mean shift based or level set based analysis, depends essentially on available a priori information relative to the localization and the shape of the object in the scene. the two approaches are part of a 3-D vision-based on-line inspection system. Results on images of manufactured parts acquired under realistic conditions illustrate the use of these two approaches. (C) 2004 SPIE and IST.

关键词： image segmentation image processing 3D image processing Inspection Manufacturing Data acquisition image resolution 3D modeling Binary data image analysis

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A digital presenter with behaviour

A digital presenter with behaviour

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6th IASTED International conference on Signal and image processing

作者： Lee, JH Lee, IH Elect & Telecommun Res Inst Digital Content Res Div Taejon 305350 South Korea

ISBN: (纸本)0889864349

computer graphics is developing day by day, and computer animation with 3D virtual character becomes usual. As this character animation is especially focused on humanoid and has fascinating factor, it is used in the variety of fields. Existing presentations for user were mostly video-based or web-based applications and it is rare to use 3D character, because of the difficulty in character animation. In this paper, we propose a digital presenter with behaviour. Our digital presenter is 3D character with animation, and presents something instead of human presenter. To make animation faster and more real, we try to add the behaviour to digital presenter's animation.

关键词： computer graphics virtual reality character animation simulation digital presenter behaviour

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