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检索条件"主题词=3D video coding"

共 119 条记录，以下是91-100 订阅

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REdUCEd RESOLUTION UPdATE FOR dEPTH MAP COMPRESSION ON THE BASIS OF TEXTURE ANd PREdICTEd IMAGE

REDUCED RESOLUTION UPDATE FOR DEPTH MAP COMPRESSION ON THE B...

引用

21st European Signal Processing Conference (EUSIPCO)

作者： Sugimoto, Shiori Shimizu, Shinya Kimata, Hideaki Kojima, Akira NTT Corp NTT Media Inteligence Labs Tokyo Japan

ISBN: (纸本)9781479936878

In 3d video compression, depth map is normally compressed by resolution reduction. To avoid artifacts in views synthesized with the reduced resolution depth map, up-sampling approaches based on special properties of depth map have been proposed. Most previous studies do not apply rate-distortion control and the quality of depth map and synthesized views is not always guaranteed because their re-sampling processes are out of the coding loop. This paper proposes a novel in-loop reduced resolution depth coding based on the scheme of a reduced resolution update mode. This is achieved by encoding prediction residuals at reduced resolution, which was obtained by performing prediction using full resolution references. We also propose an effective method for reduction of resolution for residuals and reconstruction of depth map based on Texture and predicted depth map. Experiments showed that it is possible to achieve bitrate reductions of up to 2.09% and about 1.10% on average for seven sequences.

关键词： 3d video coding depth map coding Resolution reduction Reduced resolution update depth reconstruction filter

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Parameterized Estimation of Common Motion for Image and depth Sequences

Parameterized Estimation of Common Motion for Image and Dept...

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19th National Conference on Communications (NCC)

作者： Sudhakar, Modem Vupparaboina, Kiran Kumar Jana, Soumya IIT Hyderabad Dept Elect Engn Hyderabad 502205 Andhra Pradesh India

ISBN: (纸本)9781467359528;9781467359504

Representation of 3d video using reference image and depth map sequences (2d+depth) has become standard. Although standards recommend separate encoding of image and depth, exploitation of their correlation opens up opportunities, especially for low-bit-rate applications. To this end, a common motion vector is sometimes used to compensate both the sequences. In this context, we propose a parametric method for estimation of common motion that improves upon the current image-based approach. Specifically, we identify statistical redundancy between image and depth sequences, demonstrate how the said redundancy cannot fully be exploited by a technique based on image sequences alone, and then propose a method to remove such redundancy in an optimized manner. Finally, we demonstrate the efficacy of our technique using well-known stereoscopic video sequences.

关键词： 3d video coding depth Image based Rendering Common Motion Vector MPEG-2

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Reference Viewpoints Selection for Multi-View video Plus depth coding Based on the Network Bandwidth Constraint

Reference Viewpoints Selection for Multi-View Video Plus Dep...

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International Conference on Sensors, Measurement and Intelligent Materials (ICSMIM 2012)

作者： Luo, Lei Jiang, Rongxin Tian, Xiang Chen, Yaowu Zhejiang Univ Inst Adv Digital Technol & Instrument Hangzhou 310027 Zhejiang Peoples R China

ISBN: (纸本)9783037856529

In multi-view video plus depth (MVd) coding based free viewpoint video applications, a few reference viewpoints' texture and depth videos should be compressed and transmitted at the server side. At the terminal side, the display view videos could be the decoded reference view videos or the virtual viewpoints' videos which are synthesized by dIBR technology. The entire video quality of all display views are decided by the number of reference viewpoints and the compression distortion of each reference viewpoint's texture and depth videos. This paper studies the impact of the reference viewpoints selection on the entire video quality of all display views. The results show that depending on the available network bandwidth, the MVd coding requires different selections of reference viewpoints to maximize the entire video quality of all display views.

关键词： multi-view video plus depth (MVd) reference viewpoint free viewpoint video (FVV) 3d video coding dIBR virtual view synthesis

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BACKWARd VIEW SYNTHESIS PREdICTION USING VIRTUAL dEPTH MAP FOR MULTIVIEW video PLUS dEPTH MAP coding

BACKWARD VIEW SYNTHESIS PREDICTION USING VIRTUAL DEPTH MAP F...

引用

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

作者： Shimizu, Shinya Sugimoto, Shiori Kimata, Hideaki Kojima, Akira NTT Corp NTT Media Intelligence Labs Tokyo Japan

ISBN: (纸本)9781479902880

View synthesis prediction has been studied as an efficient inter-view prediction scheme. Existing view synthesis prediction schemes fall into two types according to the pixel warping direction. While backward warping based view synthesis prediction enables block-based processing, forward warping based view synthesis prediction can handle occlusions properly. This paper proposes a two-step warping based view synthesis prediction;a virtual depth map is first generated by forward warping, and then prediction signals are generated by block-based backward warping using the virtual depth map. The technique of backward-warping-aware depth inpainting is also proposed. Experiments show that the proposed VSP scheme can achieve the decoder runtime reductions of about 37% on average with slight bitrate reductions relative to the conventional forward warping based VSP. Compared to the conventional backward warping based VSP, the proposed method reduces the bitrate for the synthesized views by up to 2.9% and about 2.2% on average.

关键词： 3d video coding Multiview video plus depth map View synthesis prediction

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SIMPLIFIEd INTER-COMPONENT dEPTH MOdELING IN 3d-HEVC 11th

SIMPLIFIED INTER-COMPONENT DEPTH MODELING IN 3D-HEVC

引用

IEEE 11th IVMSP Workshop - 3d Image/video Technologies and Applications

作者： Song, Yunseok Ho, Yo-Sung GIST Kwangju South Korea

ISBN: (纸本)9781467358576

In this paper, we present a method to reduce complexity of depth modeling modes (dMM), which is currently used in the 3d-HEVC standardization activity. dMM adds four modes to the existing HEVC intra prediction modes;the main purpose is to accurately represent object edges in depth video. Mode 3 of dMM requires distortion calculation of all pre-defined wedgelets. The proposed method employs absolute differences of neighboring pixels in the reference block. The number of wedgelets that need to be concerned can be reduced to six. Experimental results show 3.1% complexity reduction on average while maintaining coding performance, which implies that the correct wedgelet is included, while non-viable wedgelets are disregarded.

关键词： 3d video coding depth coding depth modeling

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IMPROVEd dISPARITY VECTOR dERIVATION IN 3d-HEVC

IMPROVED DISPARITY VECTOR DERIVATION IN 3D-HEVC

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

作者： Zhang, Na Chen, Yi-Wen Lin, Jian-Liang Fan, Xiaopeng Ma, Siwei Zhao, debin Gao, Wen Harbin Inst Technol Dept Comp Sci & Technol Harbin 150006 Peoples R China Mediatek Inc Hsinchu Taiwan Peking Univ Beijing Peoples R China

ISBN: (纸本)9781479902880

In the High Efficiency video coding (HEVC) based 3d video coding, 3d-HEVC, the disparity vector (dV) derivation is critical for inter-view motion prediction, interview residual prediction, disparity-compensated prediction (dCP) or any other tools exploiting inter-view correlation. In HTM-5.0.1, the dV is derived from some spatial and temporal neighbors to locate a corresponding block in another view. This paper advocates modifications of the dV derivation to reduce the complexity and to achieve slightly better coding efficiency. Firstly, we propose to remove the additional temporal block, unify the dV searching order for all views, and to impose restrictions on the temporal blocks for memory access bandwidth and complexity reduction in dV derivation. We also propose an improved dV searching order for slightly better coding performance. These proposed methods were adopted into the 3d-HEVC standard in the 3rd JCT-3V meeting in Jan. 2013.

关键词： 3d video coding dV derivation interview prediction 3d-HEVC

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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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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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Object-adaptive depth Compensated Inter Prediction for depth video coding in 3d video System

Object-adaptive Depth Compensated Inter Prediction for Depth...

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Conference on Visual Information Processing and Communication II

作者： Kang, Min-Koo Lee, Jaejoon Lim, Ilsoon Ho, Yo-Sung Gwangju Inst Sci & Technol GIST Kwangju 500712 South Korea

ISBN: (纸本)9780819484192

Nowadays, the 3d video system using the MVd (multi-view video plus depth) data format is being actively studied. The system has many advantages with respect to virtual view synthesis such as an auto-stereoscopic functionality, but compression of huge input data remains a problem. Therefore, efficient 3d data compression is extremely important in the system, and problems of low temporal consistency and viewpoint correlation should be resolved for efficient depth video coding. In this paper, we propose an object-adaptive depth compensated inter prediction method to resolve the problems where object-adaptive mean-depth difference between a current block, to be coded, and a reference block are compensated during inter prediction. In addition, unique properties of depth video are exploited to reduce side information required for signaling decoder to conduct the same process. To evaluate the coding performance, we have implemented the proposed method into MVC (multiview video coding) reference software, JMVC 8.2. Experimental results have demonstrated that our proposed method is especially efficient for depth videos estimated by dERS (depth estimation reference software) discussed in the MPEG 3dV coding group. The coding gain was up to 11.69% bit-saving, and it was even increased when we evaluated it on synthesized views of virtual viewpoints.

关键词： 3d video coding 3dTV MVC depth video coding JMVC inter prediction

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