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Picture coding Symposium (PCS)

作者： Huang, Chao Zhang, Xiang Tian, Jun Xu, Xiaozhong Liu, Shan Tencent Media Lab Palo Alto CA 94306 USA

ISBN: (纸本)9781665492577

In this paper, we present a Boundary-Preserved Geometry Video (BPGV) framework for dynamic mesh coding (DMC) with time-varying geometry, connectivity and attributes. The geometry video is generated by interpolating the 3D XYZ coordinates in the sampled 2D UV charts, and can be coded by any video codec to remove the spatial and temporal redundancies. However, the reconstruction from the geometry video itself may suffer from serious distortions because of the missing boundary information of the UV charts. Therefore it is proposed to code the boundary information of the UV charts in a separate sub-bitstream by efficient prediction and residual coding. The connectivity information can be inferred from the decoded geometry images and the boundary information via triangulation with linear complexity on the decoder side. Better coding performance can be achieved by leveraging the trade-offs between bitrate and quality from the proposed coding tools, including the adaptive chart sampling and the raw-chart coding mode. The proposed BPGV framework was submitted as a response to the MPEG's CfP on DMC and the results demonstrated its superior performance compared to a state-of-the-art mesh codec.

关键词： mesh coding geometry images remeshing triangulation

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Fast mesh-based coding of depth map sequences for efficient 3D-video reproduction using OpenGL

Fast mesh-based coding of depth map sequences for efficient ...

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5th IASTED International Conference on Visualization, Imaging, and Image Processing

作者： Grewatsch, S Müller, E Univ Rostock Inst Commun Engn D-18119 Rostock Germany

ISBN: (纸本)0889865280

During the reproduction of 3D-video based on monoscopic video and corresponding depth information, two virtual views are generated in real-time for binocular perception. This has been done by depth-image-based rendering techniques. In order to make this step more efficiently, the authors applied the capabilities of current graphics hardware to the view rendering. Therefore the platform independent OpenGL library was used. To. accomplish this approach the depth maps were converted into 3D-meshes. However, the mesh generation was computationally expensive. The purpose of this research was to discuss different methods of obtaining the meshes more efficiently. For this reason current results of human-factors experiments were taken into account. Finally, a strategy for fast mesh-based lossy compression of depth map sequences was developed.

关键词： 3D-video depth maps mesh coding OpenGL

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Level-of-detail adaptive subdivision methods for the coding of dynamic mesh sequences with V-DMC 12

Level-of-detail adaptive subdivision methods for the coding ...

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12th European Workshop on Visual Information Processing

作者： Alface, Patrice Rondao Nam, Dayun Kondrad, Lukasz Lim, Seong Yong Nokia Nokia Technol Antwerp Belgium Elect & Telecommun Res Inst Immers Media Res Sect Daejeon South Korea

ISBN: (纸本)9798350391152;9798350391145

The emerging Video-based dynamic mesh coding (V-DMC) standard is designed on the concepts of subdivision surfaces and the lifting scheme. Subdivision surfaces generate different levels-of-detail (LoD) that enable to decode and render a dynamic mesh sequence at different resolutions. The initial specifications of V-DMC only supported the use of the midpoint subdivision method, that is applied to a so-called base mesh, which is a decimated version of the input dynamic mesh sequence frame being processed. Geometry details, capturing the difference between the subdivided mesh and the original mesh are added after the mesh subdivision and are called displacements. While the midpoint subdivision has the benefit of a low complexity, it also generates large displacement data as subdivided vertices lie on the respective planes of the base mesh triangles. In this paper, we present the adaptation of three subdivision methods to V-DMC: Loop, Least Square Subdivision Surfaces (LS3), and Butterfly. We show that combining different subdivision methods at different LoDs results in significant compression performance gains.

关键词： dynamic mesh coding mesh coding Level-of-Detail subdivision lifting scheme visual volumetric coding

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Cluster parallel rendering based on encoded mesh

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第7期7卷 1124-1133页

作者： QIN Ai-hong XIONG Hua PENG Hao-yu LIU Zhen SHI Jiao-ying State Key Lab of CAD ＆ CG Zhejiang University Hangzhou 310027 China School of Computer and lnformation Technology Shanxi University Taiyuan 030006 China

Use of compressed mesh in parallel rendering architecture is still an unexplored area, the main challenge of which is to partition and sort the encoded mesh in compression-domain. This paper presents a mesh compression scheme PRMC (Parallel Rendering based mesh Compression) supplying encoded meshes that can be partitioned and sorted in parallel rendering system even in encoded-domain. First, we segment the mesh into submeshes and clip the submeshes’ boundary into Runs, and then piecewise compress the submeshes and Runs respectively. With the help of several auxiliary index tables, compressed submeshes and Runs can serve as rendering primitives in parallel rendering system. Based on PRMC, we design and implement a parallel rendering architecture. Compared with uncompressed representation, experimental results showed that PRMC meshes applied in cluster parallel rendering system can dramatically reduce the communication requirement.

关键词： Cluster Parallel rendering Rendering Compression algorithm mesh coding mesh segmentation

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Image-based surface compression

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COMPUTER GRAPHICS FORUM 2008年第6期27卷 1647-1663页

作者： Ochotta, Tilo Saupe, Dietmar Univ Utah Salt Lake City UT 84112 USA Univ Konstanz D-7750 Constance Germany

We present a generic framework for compression of densely sampled three-dimensional (3D) surfaces in order to satisfy the increasing demand for storing large amounts of 3D content. We decompose a given surface into patches that are parameterized as elevation maps over planar domains and resampled on regular grids. The resulting shaped images are encoded using a state-of-the-art wavelet image coder. We show that our method is not only applicable to mesh- and point-based geometry, but also outperforms current surface encoders for both primitives.

关键词： height fields 3D model coding mesh coding

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Benchmarking Open-Source Static 3D mesh Codecs for Immersive Media Interactive Live Streaming

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IEEE JOURNAL ON EMERGING AND SELECTED TOPICS IN CIRCUITS AND SYSTEMS 2019年第1期9卷 190-203页

作者： Doumanoglou, Alexandros Drakoulis, Petros Zioulis, Nikolaos Zarpalas, Dimitrios Daras, Petros Ctr Res & Technol Hellas Informat Technol Inst Visual Comp Lab GR-57001 Thessaloniki Greece

This paper provides a systematic understanding of the requirements of live 3D mesh coding, targeting (tele-)immersive media streaming applications. We thoroughly benchmark in rate-distortion and runtime performance terms, four static 3D mesh coding solutions that are openly available. Apart from mesh geometry and connectivity, our analysis includes experiments for compressing vertex normals and attributes, something scarcely found in the literature. In addition, we provide a theoretical model of the tele-immersion pipeline that calculates its expected frame rate, as well as lower and upper bounds for its end-to-end latency. In order to obtain these measures, the theoretical model takes into account the compression performance of the codecs and some indicative network conditions. Based on the results we obtained through our codec benchmarking, we used our theoretical model to calculate and provide concrete measures for these tele-immersion pipeline's metrics and discuss on the optimal codec choice depending on the network setup. This offers deep insight into the available solutions and paves the way for future research.

关键词： 3D compression mesh coding tele-immersion 3D media streaming performance evaluation time varying meshes

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Enabling progressive dynamic mesh geometry data extraction in V-DMC 12

Enabling progressive dynamic mesh geometry data extraction i...

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12th European Workshop on Visual Information Processing

作者： Alface, Patrice Rondao Kondrad, Lukasz Kammachi-Sreedhar, Kashyap Nokia Nokia Technol Antwerp Belgium Nokia Nokia Technol Munich Germany Nokia Nokia Technol Tampere Finland

ISBN: (纸本)9798350391152;9798350391145

The emerging Video-based dynamic mesh coding standard is designed on the concepts of subdivision surfaces and the lifting scheme applied to a simplified variant of a dynamic mesh. Those processes create displacement data, i.e., residual information that is hierarchically predicted through each subdivision iteration, that is then coded using traditional 2D video codecs. The current draft of the standard defines the packing of the displacement data in a video frame in a way that does not support adaptations based on Level-of-Detail (LoD). In this paper, we describe and evaluate an experimental LoD adaptive displacement packing method that could be used to optimize bandwidth consumption or to save computational complexity and battery at the client side. We show that a modified packing of the displacement video data and a LoDadaptive selection of lifting parameters, combined with HEVC motion constrained tile sets provide this functionality with a low impact on compression performance. The LoD adaptive displacement packing method described in this paper has been recently adopted into the V-DMC standard specifications.

关键词： dynamic mesh coding mesh coding Level-of-Detail subdivision lifting scheme visual volumetric coding

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PARTIAL INTER-FRAME coding FOR DYNAMIC meshES 31

PARTIAL INTER-FRAME CODING FOR DYNAMIC MESHES

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2024 International Conference on Image Processing

作者： Jin, Xudong Xu, Jianfeng Kawamura, Kei KDDI Res Inc Adv Visual Commun Lab XR Div Fujimino Japan

ISBN: (纸本)9798350349405;9798350349399

The MPEG-3DGH group is advancing a new standard for dynamic mesh encoding, known as Video-based Dynamic mesh coding (V-DMC). While V-DMC improves efficiency by toggling between intra- and inter-frame coding, it struggles with dynamic meshes that change inconsistently across frames. To address this issue, we introduce a novel partial inter-frame coding mode within the V-DMC framework. The method initiates by partitioning the adjacent frames into temporally aligned segments. These segments are then classified as suitable for either intra-frame or inter-frame coding based on the detection of inconsistent changes. Leveraging these segmentations, we introduce a partial inter-frame coding mode that allows for the selective application of intra- and inter-frame coding at the level of individual segments. Experiments on the MPEG V-DMC test sequences demonstrate that our method can achieve BD-rate improvement over the anchor in terms of D1, D2, Luma, Cb, and Cr PSNRs by -2.1%, -2.7%, -4.7%, -5.4%, and -4.5%, respectively.

关键词： Dynamic mesh partial inter-frame coding V-DMC mesh segmentation mesh coding

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Octmesh-interactive mesh browsing over the Internet 1

OctMesh-interactive mesh browsing over the Internet

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1st International Conference on Information Technology: coding and Computing, ITCC 2000

作者： Wang, Hongwu Li, Jin Microsoft Research China Sigma Center 5F No. 49 Zhichun Road Haidian District Beijing100080 China

ISBN: (纸本)0769505406

This paper proposes Octmesh, an interactive mesh browsing scheme over the Internet. In Octmesh, a large-scale mesh is encoded into one bit-stream, which is organized with respect to spatial locality and resolution. When the mesh is viewed over the Internet, by examining the user's viewpoint, the compressed mesh with desired locality and resolution is streamed to the client. Octmesh enables a large-scale mesh to be viewed quickly, over the Internet. © 2000 IEEE.

关键词： Internet mesh coding progressive view-dependent

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