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检索条件"主题词=3D video coding"

共 119 条记录，以下是101-110 订阅

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OVERVIEW OF THE MULTIVIEW HIGH EFFICIENCY video coding (MV-HEVC) STANdARd

OVERVIEW OF THE MULTIVIEW HIGH EFFICIENCY VIDEO CODING (MV-H...

引用

IEEE International Conference on Image Processing (ICIP)

作者： Hannuksela, Miska M. Yan, Ye Huang, Xuehui Li, Houqiang Nokia Technol Mountain View CA 94043 USA Univ Sci & Technol China Hefei Peoples R China

ISBN: (纸本)9781479983391

This paper reviews the multiview extension (MV-HEVC) of the High Efficiency video coding (HEVC) standard. MV-HEVC is capable of multiview video coding with or without accompanying depth views. The key design concepts and design elements of MV-HEVC are described in the paper. Furthermore, the features and characteristics of MV-HEVC compared to other standardized video codec extensions for three-dimensional (3d) video coding are reviewed.

关键词： HEVC MV-HEVC 3d video coding

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Study of a Holographic TV System Based on Multi-View Images and depth Maps

Study of a Holographic TV System Based on Multi-View Images ...

引用

Conference on Practical Holography XXVII - Materials and Applications

作者： Senoh, Takanori Ichihashi, Yasuyuki Oi, Ryutaro Sasaki, Hisayuki Yamamoto, Kenji Natl Inst Informat & Commun Technol Koganei Tokyo 1848795 Japan

ISBN: (纸本)9780819494139

Electronic holography technology is expected to be used for realizing an ideal 3dTV system in the future, providing perfect 3d images. Since the amount of fringe data is huge, however, it is difficult to broadcast or transmit it directly. To resolve this problem, we investigated a method of generating holograms from depth images. Since computer generated holography (CGH) generates huge fringe patterns from a small amount of data for the coordinates and colors of 3d objects, it solves half of this problem, mainly for computer generated objects (artificial objects). For the other half of the problem (how to obtain 3d models for a natural scene), we propose a method of generating holograms from multi-view images and associated depth maps. Multi-view images are taken by multiple cameras. The depth maps are estimated from the multi-view images by introducing an adaptive matching error selection algorithm in the stereo-matching process. The multi-view images and depth maps are compressed by a 2d image coding method that converts them into Global View and depth (GVd) format. The fringe patterns are generated from the decoded data and displayed on 8Kx4K liquid crystal on silicon (LCOS) display panels. The reconstructed holographic image quality is compared using uncompressed and compressed images.

关键词： Holographic TV system computer generated holography 3d model multi-view image adaptive depth map estimation 3d video coding Global View and depth format

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Motion Estimation for depth Maps coding Based on Rendered View distortion 4

Motion Estimation for Depth Maps Coding Based on Rendered Vi...

引用

International Conference on Audio, Language and Image Processing

作者： Shi, Zhiru Shi, Yunyu Zhang, Xiaoyun Gao, Zhiyong Shanghai Jiao Tong Univ Inst Image Commun & Informat Proc Shanghai Peoples R China

ISBN: (纸本)9781479939039

Incolour plus depth map 3d video, depth map is a luminance image that aids the virtual views generation. Since it is not the final image viewed by end user, the conventional depth map compression method, which minimizes the pixel errors of the depth map, introduces more distortions to the virtual rendered images. In this paper, a novel motion estimation scheme for depth map coding is proposed. By employing rendered view distortion in Rate-distortion Optimization, the optimal Motion Vector is determined to improve the rendered views quality. An effective Lagrange multiplier is also derived. Experimental results illustrate that 34%-63% of bit can be saved comparing to the conventional motion estimation method.

关键词： 3d video coding dIBR depth Map coding Rendered View distortion Motion Estimation

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LIGHT-FIELd video coding USING GEOMETRY-BASEd dISPARITY COMPENSATION

LIGHT-FIELD VIDEO CODING USING GEOMETRY-BASED DISPARITY COMP...

引用

3dTV-Conference on True Vision - Capture, Transmission and display of 3d video (3dTV-CON)

作者： Conti, Caroline Kovacs, Peter Tamas Balogh, Tibor Nunes, Paulo Soares, Luis ducla Inst Telecomunicacoes Lisbon Portugal Univ Inst Lisbon (ISCTE IUL) Lisbon Portugal Holografika Budapest Hungary Tampere Univ Technol Dept Signal Proc FIN-33101 Tampere Finland

ISBN: (纸本)9781479947584

One of the main challenges in 3d light-field imaging approaches lies in the massive amount of visual information involved in providing 3d content with sufficient resolution. Consequently, adequate coding tools are essential for efficient transmission and storage of this type of content. In this context, this paper presents and evaluates two coding solutions based on the High Efficiency video coding (HEVC) scheme and for efficient compression of the 3d light-field content. These two coding schemes aim to exploit the 3d geometry-based disparity information in the 3d light field content and replace the block-based disparity estimation. In the first scheme, the disparity map of each view is used to directly derive the vectors for compensation, and in the second scheme these disparity vectors (for all views) are calculated (for non-occluded areas) from the disparity map of the base view. A comparative study of these proposed coding schemes is performed and future research directions are also discussed.

关键词： Light-field HoloVizio HEVC 3d video coding

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Geometry Compensation using depth and Camera Parameters for Three-dimensional video coding

Geometry Compensation using Depth and Camera Parameters for ...

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Conference on Stereoscopic displays and Applications XXIII (Sd and A)/IS and T/SPIE Electronic Imaging - Science and Technology Symposium

作者： Kim, dong Hyun Seo, Jungdong Ryu, Seungchul Lee, Jin Young Wey, Ho-Cheon Sohn, Kwanghoon Yonsei Univ Dept Elect & Elect Engn 50 Yonsei Ro Seoul 120749 South Korea Samsung Eelect Co Ltd Samsung Adv Inst Technol Gyeonggi 449712 South Korea

ISBN: (纸本)9780819489357

One of the important issues for a next generation broadcasting system is how to compress a massive amount of three-dimensional (3d) video efficiently. In this paper, we propose a geometry compensation method for 3d video coding exploiting color videos, depth videos and camera parameters. In the proposed method, we first generate a compensated view, which is located at the geometrically same position with the current view, using depth and camera parameters of neighboring views. Then, the compensated view is used as a reference picture to reduce the inter-view redundancies such as disparity and motion vectors. Furthermore, considering the direction of hole-regions, we propose a hole-filling method for picture of P-view to fill up the holes based on the neighboring background pixels. The experimental results show that the proposed algorithm increases Bd-PSNRs up to 0.22dB and 0.63dB for P- and B-views, respectively. Meanwhile, we achieved up to 6.28% and 18.32% Bd bit-rates gain for P- and B- views, respectively.

关键词： 3d video coding Multi-View plus depth (MVd) Geometry compensation method

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INTERACTIVE MULTIVIEW video SYSTEM WITH LOW dEcoding COMPLEXITY

INTERACTIVE MULTIVIEW VIDEO SYSTEM WITH LOW DECODING COMPLEX...

引用

18th IEEE International Conference on Image Processing (ICIP)

作者： Maugey, Thomas Frossard, Pascal Ecole Polytech Fed Lausanne Signal Proc Lab LTS4 Lausanne Switzerland

ISBN: (纸本)9781457713033

Research in multimedia is always investigating new ways of improving the immersive experience of the users. One current solution consists in designing systems which offer a high level of interactivity, such as multiview content navigation where the point of view can be changed while watching at a video sequence (e. g., free viewpoint television, gaming, etc.). The coding algorithm designed for the transmission of such media streams must be adapted to these novel decoder needs. However, video plus depth data transmission is usually performed by considering the information flows as two sequences encoded with MVC schemes. Whereas it achieves good compression performance, this coding approach is not appropriate for interactive applications since the decoding of a frame often requires the prior transmission and decoding of several reference frames. Moreover, the techniques recently developed to improve interactivity are generally implemented at the decoder, whose computational complexity requirements are augmented. In this paper, we propose a novel coding scheme for video plus depth sequences that is adapted to user navigation;contrarily to several common approaches, the additional complexity is added on the encoder side so that the decoder stays simple. We further propose to limit the additional bandwidth imposed by interactivity requirements by designing a rate allocation algorithm that builds on a model of the user behavior. A first version of our novel coding architecture is evaluated in terms of rate-distortion performance, where it is shown to offer a high interactivity at a reasonable bandwidth cost.

关键词： 3d video coding depth interactive navigation

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Quad-tree based Inter-view Motion Prediction

Quad-tree based Inter-view Motion Prediction

引用

IEEE Visual Communications and Image Processing (VCIP) Conference

作者： Ma, Ji Zhang, Na Fan, Xiaopeng Xiong, Ruiqin Zhao, debin Harbin Inst Technol Dept Comp Sci & Technol Harbin Peoples R China Peking Univ Inst Digital Media Beijing Peoples R China

ISBN: (纸本)9781467373142

As a 3d video extension of Audio video coding Standard (AVS), 3d-AVS is being developed to improve the coding efficiency of multi-view video. Since multi-view video is composed of projections of the same scenery from different viewpoints at the same time instant, it contains a large amount of inter-view redundancies. To exploit the inter-view correlation, this paper presents a method to derive the motion parameters for a coding unit (CU) in the dependent view from the already coded inter-view picture. The algorithm is based on quad-tree partitioning, each CU could be recursively split into four sub-CUs of the same size and whether each sub-CU is further split is determined by comparing the derived motion parameters. Experimental results show that the proposed method provides 8.7% Bd-rate saving for both video 1 and video 2 in low delay configuration and the Bd-rate saving is up to 14.5% and 13.7% on video 1 and video 2 for Balloons. This method has been proposed and adopted into the 3d-AVS standard.

关键词： 3d video coding quad-tree inter-view motion prediction disparity vector 3d-AVS

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Neighboring block based disparity vector derivation for 3d-AVC

Neighboring block based disparity vector derivation for 3D-A...

引用

IEEE International Conference on Visual Communications and Image Processing (VCIP)

作者： Zhang, Li Kang, Jewon Zhao, Xin Chen, Ying Joshi, Rajan Qualcomm Technol Inc San Diego CA 92121 USA

ISBN: (纸本)9781479902880

3d-AVC, being developed under Joint Collaborative Team on 3d video coding (JCT-3V), significantly outperforms the Multiview video coding plus depth (MVC+d) which has no new macroblock level coding tools compared to Multiview video coding extension of H.264/AVC (MVC). However, for multiview compatible configuration, i.e., when texture views are decoded without accessing depth information, the performance of the current 3d-AVC is only marginally better than MVC+d. The problem is caused by the lack of disparity vectors which can be obtained only from the coded depth views in 3d-AVC. In this paper, a disparity vector derivation method is proposed by using the motion information of neighboring blocks and applied along with existing coding tools in 3d-AVC. The proposed method improves 3d-AVC in the multiview compatible mode substantially, resulting in about 20% bitrate reduction for texture coding. When enabling the so-called view synthesis prediction to further refine the disparity vectors, the performance of the proposed method is 31% better than MVC+d and even better than 3d-AVC under the best performing 3d-AVC configuration.

关键词： Multiview video coding 3d video coding MVC 3d-AVC disparity vector deviation

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Neighboring block based disparity vector derivation for multiview compatible 3d-AVC

Neighboring block based disparity vector derivation for mult...

引用

Conference on Applications of digital Image Processing XXXVI

作者： Kang, Jewon Chen, Ying Zhang, Li Zhao, Xin Karczewicz, Marta Qualcomm Technol Inc San Diego CA USA

ISBN: (纸本)9780819497062

3d-AVC being developed under Joint Collaborative Team on 3d video coding (JCT-3V) significantly outperforms the Multiview video coding plus depth (MVC+d) which simultaneously encodes texture views and depth views with the multiview extension of H. 264/AVC (MVC). However, when the 3d-AVC is configured to support multiview compatibility in which texture views are decoded without depth information, the coding performance becomes significantly degraded. The reason is that advanced coding tools incorporated into the 3d-AVC do not perform well due to the lack of a disparity vector converted from the depth information. In this paper, we propose a disparity vector derivation method utilizing only the information of texture views. Motion information of neighboring blocks is used to determine a disparity vector for a macroblock, so that the derived disparity vector is efficiently used for the coding tools in 3d-AVC. The proposed method significantly improves a coding gain of the 3d-AVC in the multiview compatible mode about 20% Bd-rate saving in the coded views and 26% Bd-rate saving in the synthesized views on average.

关键词： Multiview video coding 3d video coding MVC MVC plus d 3d-AVC disparity vector deviation

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Low complexity multiview video coding

Low complexity multiview video coding

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作者： Khattak, Shadan De Montfort University

学位级别：doctor

3d video is a technology that has seen a tremendous attention in the recent years. Multiview video coding (MVC) is an extension of the popular H.264 video coding standard and is commonly used to compress 3d videos. It offers an improvement of 20% to 50% in compression efficiency over simulcast encoding of multiview videos using the conventional H.264 video coding standard. However, there are two important problems associated with it: (i) its superior compression performance comes at the cost of significantly higher computational complexity which hampers the real-world realization of MVC encoder in applications such as 3d live broadcasting and interactive Free Viewpoint Television (FTV), and (ii) compressed 3d videos can suffer from packet loss during transmission, which can degrade the viewing quality of the 3d video at the decoder. This thesis aims to solve these problems by presenting techniques to reduce the computational complexity of the MVC encoder and by proposing a consistent error concealment technique for frame losses in 3d video transmission. The thesis first analyses the complexity of the MVC encoder. It then proposes two novel techniques to reduce the complexity of motion and disparity estimation. The first method achieves complexity reduction in the disparity estimation process by exploiting the relationship between temporal levels, type of macroblocks and search ranges while the second method achieves it by exploiting the geometrical relation- ship between motion and disparity vectors in stereo frames. These two methods are then combined with other state-of-the-art methods in a unique framework where gains add up. Experimental results show that the proposed low-complexity framework can reduce the encoding time of the standard MVC encoder by over 93% while maintaining similar compression efficiency performance. The addition of new View Synthesis Prediction (VSP) modes to the MVC encoding framework improves the compression efficiency of MVC. However, te

关键词： multiview video coding 3d video video Compression video coding MVC 3d video coding

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