检索结果-内蒙古大学图书馆

Performance Analysis of depth Intra-coding in 3d-HEVC

IEEE TRANSACTIONS ON CIRCUITS ANd SYSTEMS FOR video TECHNOLOGY 2019年第8期29卷 2509-2520页

作者： Sanchez, Gustavo Silveira, Jarbas Agostini, Luciano V. Marcon, Cesar IF Farroupilha Dept Comp Sci BR-97555000 Alegrete Brazil Pontificia Univ Catolica Rio Grande do Sul BR-90619900 Porto Alegre RS Brazil Univ Fed Ceara Engn Lab Comp Syst BR-60020181 Fortaleza Ceara Brazil Univ Fed Pelotas Grp Architectures & Integrated Circuits BR-96010610 Pelotas Brazil Pontificia Univ Catolica Rio Grande do Sul Dept Comp Sci BR-90619900 Porto Alegre RS Brazil

The depth maps intra-frame prediction of 3d High Efficiency video coding (3d-HEVC) inherits all texture encoding techniques provided by HEVC and provides new coding tools for depth map predictions. These tools comprise algorithms, such as bipartition modes, intra-picture skip, and dC-only. This paper details these tools and shows how they work together with the original HEVC algorithms in the depth map intra-frame prediction for allowing high-efficiency encoding. Besides, this paper analyzes the encoding time and the encoding mode distribution of the intra-frame prediction tools over different quantization scenarios. We aim to provide support for upcoming works on depth map encoding, including complexity reduction and control, real-time embedded systems implementations, and even the development of improved tools to encode depth maps.

关键词： 3d-HEVC intra-frame prediction depth maps 3d video coding

来源：评论

学校读者我要写书评

暂无评论

SYNTHESIZEd dISPARITY VECTORS FOR 3d video coding

SYNTHESIZED DISPARITY VECTORS FOR 3D VIDEO CODING

引用

IEEE International Conference on Image Processing

作者： Yin Zhao Yichen Zhang Peng Lu Lu Yu Institute of Information and Communication Engineering Zhejiang University

ISBN: (纸本)9781479923427

In 3d video coding, some dependent-view coding tools may utilize derived disparity vectors (dV) to locate inter-view correspondences, such as the Backward block-based View Synthesis Prediction (BVSP) and depth-based Motion Vector Prediction (dMVP) in ATM. A typical way to derive a dV for a target block, as performed in ATM, is to convert reconstructed depth values associated with the block to a dV. However, this approach only works in depth-first coding order (dFCO) and becomes inapplicable when the dependent-view texture is coded prior to the depth, i.e., in texture-first coding order (TFCO). In this paper, a sparse dV field is synthesized from the depth map of a coded reference view to provide the dVs required by dependent-view coding tools in TFCO. The synthesized sparse dV field is accurate to support disparity-aided coding tools in different coding orders, while only introducing 2% decoding time increase. With the proposed method, BVSP and dMVP can be applied in both TFCO and dFCO, which mitigates the large coding performance gap (around 20% Bd rate) between TFCO and dFCO of ATM.

关键词： 3d video coding depth-based motion vector prediction disparity vector view synthesis prediction

来源：评论

学校读者我要写书评

暂无评论

CTU Layer Rate Control Algorithm in Scene Change video for Free-Viewpoint video

引用

IEEE ACCESS 2020年 8卷 24549-24560页

作者： Yan, Tao Ra, In-Ho Wen, Hui Weng, Min-Hang Zhang, Qian Che, Yan Putian Univ Sch Informat Engn Putian 351100 Peoples R China Kunsan Natl Univ Sch Comp Informat & Commun Engn Gunsan 54150 South Korea Shanghai Normal Univ Sch Informat & Electromech Engn Shanghai 200234 Peoples R China

At present, the rate control algorithm for multiview high-efficiency video coding (MV-HEVC) does not have the capability of efficient coding tree unit(CTU) layer bit allocation, and the video quality varies greatly for sequences with sudden scene changes or large motions. To overcome this limitation, this paper proposes a rate control algorithm for MV-HEVC based on scene detection. Firstly, we established rho domain rate control model based on multi-objective optimization. Then, it uses image similarity to make reasonable bit allocation among viewpoints. If the video scene is switched, the image similarity is recalculated, and then the correlation between the weights of the interview point rates and the correlation between the viewpoints are analyzed. Finally, the frame layer rate control considers the layer B-frame and other factors in allocating the code rate, and the basic unit layer rate control adopts different quantization methods according to the content complexity of the CTU. Experimental results show that the proposed rate control algorithm can maintain good coding efficiency and decrease the average video quality variation by 25.29%.

关键词： 3d video coding scene detection rate control image similarity analysis bit allocation

来源：评论

学校读者我要写书评

暂无评论

引用

Conference on Applications of digital Image Processing XXXVI

作者： Conti, Caroline Nunes, Paulo Soares, Luis ducla ISCTE Univ Inst Lisbon P-1649026 Lisbon Portugal

ISBN: (纸本)9780819497062

Holoscopic imaging, also known as integral imaging, has been recently attracting the attention of the research community, as a promising glassless 3d technology due to its ability to create a more realistic depth illusion than the current stereoscopic or multiview solutions. However, in order to gradually introduce this technology into the consumer market and to efficiently deliver 3d holoscopic content to end-users, backward compatibility with legacy displays is essential. Consequently, to enable 3d holoscopic content to be delivered and presented on legacy displays, a display scalable 3d holoscopic coding approach is required. Hence, this paper presents a display scalable architecture for 3d holoscopic video coding with a three-layer approach, where each layer represents a different level of display scalability: Layer 0 - a single 2d view;Layer 1 - 3d stereo or multiview;and Layer 2 - the full 3d holoscopic content. In this context, a prediction method is proposed, which combines inter-layer prediction, aiming to exploit the existing redundancy between the multiview and the 3d holoscopic layers, with self-similarity compensated prediction (previously proposed by the authors for non-scalable 3d holoscopic video coding), aiming to exploit the spatial redundancy inherent to the 3d holoscopic enhancement layer. Experimental results show that the proposed combined prediction can improve significantly the rate-distortion performance of scalable 3d holoscopic video coding with respect to the authors' previously proposed solutions, where only inter-layer or only self-similarity prediction is used.

关键词： display scalability HEVC integral imaging 3d holoscopic video coding 3d video coding

来源：评论

学校读者我要写书评

暂无评论

depth Intra coding for 3d video Based on Geometric Primitives

引用

IEEE TRANSACTIONS ON CIRCUITS ANd SYSTEMS FOR video TECHNOLOGY 2016年第3期26卷 570-582页

作者： Merkle, Philipp Mueller, Karsten Marpe, detlev Wiegand, Thomas Heinrich Hertz Inst Nachrichtentech Berlin GmbH Fraunhofer Inst Telecommun Dept Video Coding & Analyt D-10587 Berlin Germany Tech Univ Berlin Dept Elect Engn & Comp Sci D-10623 Berlin Germany

This paper presents an advanced depth intra-coding approach for 3d video coding based on the High Efficiency video coding (HEVC) standard and the multiview video plus depth (MVd) representation. This paper is motivated by the fact that depth signals have specific characteristics that differ from those of natural signals, i.e., camera-view video. Our approach replaces conventional intra-picture coding for the depth component, targeting a consistent and efficient support of 3d video applications that utilize depth maps or polygon meshes or both, with a high depth coding efficiency in terms of minimal artifacts in rendered views and meshes with a minimal number of triangles for a given bit rate. For this purpose, we introduce intra-picture prediction modes based on geometric primitives along with a residual coding method in the spatial domain, substituting conventional intra-prediction modes and transform coding, respectively. The results show that our solution achieves the same quality of rendered or synthesized views with about the same bit rate as MVd coding with the 3d video extension of HEVC (3d-HEVC) for high-quality depth maps and with about 8% less overall bit rate as with 3d-HEVC without related depth tools. At the same time, the combination of 3d video with 3d computer graphics content is substantially simplified, as the geometry-based depth intra signals can be represented as a surface mesh with about 85% less triangles, generated directly in the decoding process as an alternative decoder output.

关键词： 3d video coding 3d video extension of HEVC (3d-HEVC) depth intra coding High Efficiency video coding (HEVC) inter component prediction mesh extraction multiview video plus depth (MVd) wedgelets

来源：评论

学校读者我要写书评

暂无评论

3d MOTION ESTIMATION FOR 3d video coding

3D MOTION ESTIMATION FOR 3D VIDEO CODING

引用

IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Paul, Manoranjan Gao, Junbin Anotolovich, Michael Charles Sturt Univ Sch Comp & Math Bathurst NSW 2795 Australia

ISBN: (纸本)9781467300469

H.264/MVC multi-view video coding provides a better compression rate compared to the simulcast coding using hierarchical B-picture prediction structure exploiting inter-and intra-view redundancy. However, this technique imposes random access frame delay as well as requiring huge computational time. In this paper a novel technique is proposed using 3d motion estimation (3d-ME) to overcome the problems. In the 3d-ME technique, a 3d frame is formed using the same temporal frames of all views and ME is carried out for the current 3d frame using the immediate previous 3d frame as a reference frame. As the correlation among the intra-view images is higher compared to the correlation among the inter-view images, the proposed 3d-ME technique reduces the overall computational time and eliminates the frame delay with comparable rate-distortion (Rd) performance compared to H.264/MVC. Another technique is also proposed in the paper where an extra reference 3d frame comprising dynamic background frames (the most common frame of a scene i.e., McFIS) of each view is used for 3d-ME. Experimental results reveal that the proposed 3d-ME-McFIS technique outperforms the H.264/MVC in terms of improved Rd performance by reducing computational time and by eliminating the random access frame delay.

关键词： McFIS 3d Motion Estimation 3d video coding uncovered background hierarchical B-picture MRFs

来源：评论

学校读者我要写书评

暂无评论

A Framework of 3d video coding using View Synthesis Prediction

A Framework of 3D Video Coding using View Synthesis Predicti...

引用

29th Picture coding Symposium (PCS)

作者： Lee, Cheon Ho, Yo-Sung GIST Kwangju 500712 South Korea

ISBN: (纸本)9781457720482

The advanced 3d video system employs the multi-view video plus depth (MVd) format to support free-viewpoint navigation and comfortable 3d video. Therefore, the prediction structure of the multi-view video coding (MVC) can be used for 3d video coding. The view synthesis prediction method is designed to exploit inter-view correlation using the virtual view generation;hence it is suitable for 3d video coding. In this paper, we propose an efficient framework for 3d video coding using view synthesis prediction to compress multi-view color and depth data simultaneously. We designed the coding procedure of MVd data with four types of view synthesis methods according to the view position. The experimental results showed that the proposed framework improved the coding performance at most 0.9 dB for the multi-view color videos.

关键词： 3d video coding view syntehsis prediction framework for 3d video coding multi-view video coding

来源：评论

学校读者我要写书评

暂无评论

AVS 3d video coding Technology and System

引用

ZTE Communications 2012年第2期10卷 13-18页

作者： Siwei Ma Shiqi Wang Wen Gao Institute of Digital Media Peking University Beijing 100871 China

Following the success of the audio video standard （AVS） for 2d video coding, in 2008, the China AVS workgroup started developing 3d video （3dV） coding techniques. In this paper, we discuss the background, technical features, and applications of AVS 3dV coding technology. We introduce two core techniques used in AVS 3dV coding： inter-view prediction and enhanced stereo packing coding. We elaborate on these techniques, which are used in the AVS real-time 3dV encoder. An application of the AVS 3dV coding system is presented to show the great practical value of this system. Simulation results show that the advanced techniques used in AVS 3dV coding provide remarkable coding gain compared with techniques used in a simulcast scheme.

关键词： AVS 3d video coding inter-view prediction stereo packing

来源：评论

学校读者我要写书评

暂无评论

Objective Models for Performance Comparison of Compression Algorithms for 3dTV

Objective Models for Performance Comparison of Compression A...

引用

作者： Kufa, J. Brno University of Technology

Efficient video compression algorithms in advanced multimedia broadcasting systems are in high demand. In the last decades, different video compression tools have been developed which can influence the final Quality of Experience in different ways. This paper has two goals. The first goal is to present a study of different compression algorithms available for stereoscopic 3d videos. The second goal is to present the possibilities in the creation of new stereoscopic models. The well-established video codecs (AVC, MVC, HEVC and MV-HEVC) are considered as encoders. Generic objective video quality metrics are used to analyze the compression efficiencies of the considered codecs, extended with results from subjective tests. The correlations between the objective and subjective scores are analyzed statistically. due to unsatisfactory results of generic 2d metrics for the stereoscopic sequences used in the test, new objective models are presented. Such models show improved correlation with subjective stereoscopic video quality. The validation, verification and a description of models are presented in detail.

关键词： 3d video coding AVC MVC HEVC MV-HEVC objective and subjective video quality metrics MOS Spearman and Pearson rank correlation

来源：评论

学校读者我要写书评

暂无评论

Enhanced zonal search algorithm for motion estimation in depth-map coding

引用

SIGNAL IMAGE ANd video PROCESSING 2018年第3期12卷 523-530页

作者： Oh, Byung Tae Korea Aerosp Univ Goyang South Korea

This paper presents a novel motion estimation scheme for depth-map coding. depth map has a couple of different characteristics compared with the common color scene, and therefore, careful investigation of the conventional fast motion search schemes is required. In this paper, I first provide the necessity of the depth-oriented motion search scheme based on experiments and then analyze the problems of the conventional methods. On the basis of the analysis, I propose to use the initial position refinement step during a motion search. In detail, the modification of the one-at-a-time search scheme is proposed for improvement of the prediction accuracy, and an initial direction selection and a 1-bit transform scheme follow for complexity reduction. The experimental results show that the proposed scheme can achieve coding gains of more than 3% on average over the state-of-the-art zonal search methods while keeping the overall complexity increase low.

关键词： Motion estimation Fast motion search depth map 3d video coding Multiview plus depth map (MVd)

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：