检索结果-内蒙古大学图书馆

19th IEEE International Conference on Image Processing (ICIP)

作者： Lucas, Luis F. R. Rodrigues, Nuno M. M. Pagliari, Carla L. da Silva, Eduardo A. B. de Faria, Sergio M. M. Univ Fed Rio de Janeiro Inst Telecomunicacoes Rio De Janeiro Brazil Inst Politecn Leiria ESTG Leiria Brazil Inst Mil Engn DEE Rio De Janeiro Brazil Univ Fed Rio de Janeiro PEE COPPE DEL Poli Rio De Janeiro Brazil

ISBN: (纸本)9781467325332;9781467325349

The importance to develop more efficient 3D and multi-view data representation algorithms results from the recent market growth for 3D video equipments and associated services. One of the most investigated formats is video+depth which uses depth image based rendering (DIBR) to combine the information of texture and depth, in order to create an arbitrary number of views in the decoder. Such approach requires that depth information must be accurately encoded. However, methods usually employed to encode texture do not seem to be suitable for depth map coding. In this paper we propose a novel depth map coding algorithm based on the assumption that depth images are piecewise-linear smooth signals. This algorithm is designed to encode sharp edges using a flexible dyadic block segmentation and hierarchical intra-prediction framework. The residual signal from this operation is aggregated into blocks which are approximated using linear modeling functions. Furthermore, the proposed algorithm uses a dictionary that increases the coding efficiency for previously used approximations. Experimental results for depth map coding show that synthesized views using the depth maps encoded by the proposed algorithm present higher PSNR than their counterparts, demonstrating the method's efficiency.

关键词： depth map coding linear modeling function predictive coding depth image based rendering

来源：评论

学校读者我要写书评

暂无评论

OPTIMIZATION OF OCCLUSION-INDUCING depth PIXELS IN 3-D VIDEO coding 25

OPTIMIZATION OF OCCLUSION-INDUCING DEPTH PIXELS IN 3-D VIDEO...

引用

25th IEEE International Conference on Image Processing (ICIP)

作者： Gao, Pan Ozcinar, Cagri Smolic, Aljosa Nanjing Univ Aeronaut & Astronaut Coll Comp Sci & Technol Nanjing Jiangsu Peoples R China Trinity Coll Dublin Sch Comp Sci & Stat V SENSE Project Dublin Ireland

ISBN: (纸本)9781479970612

The optimization of occlusion-inducing depth pixels in depth map coding has received little attention in the literature, since their associated texture pixels are occluded in the synthesized view and their effect on the synthesized view is considered negligible. However, the occlusion-inducing depth pixels still need to consume the bits to be transmitted, and will induce geometry distortion that inherently exists in the synthesized view. In this paper, we propose an efficient depth map coding scheme specifically for the occlusion-inducing depth pixels by using allowable depth distortions. Firstly, we formulate a problem of minimizing the overall geometry distortion in the occlusion subject to the bit rate constraint, for which the depth distortion is properly adjusted within the set of allowable depth distortions that introduce the same disparity error as the initial depth distortion. Then, we propose a dynamic programming solution to find the optimal depth distortion vector for the occlusion. The proposed algorithm can improve the coding efficiency without alteration of the occlusion order. Simulation results confirm the performance improvement compared to other existing algorithms.

关键词： Occlusion depth map coding allowable depth errors optimization

来源：评论

学校读者我要写书评

暂无评论

SIMPLIFIED depth map INTRA coding WITH AN OPTIONAL depth LOOKUP TABLE

SIMPLIFIED DEPTH MAP INTRA CODING WITH AN OPTIONAL DEPTH LOO...

引用

International Conference on 3D Imaging (IC3D)

作者： Jaeger, Fabian Rhein Westfal TH Aachen Inst Nachrichtentech Aachen Germany

ISBN: (纸本)9781479915804

3D Video is a new technology, which requires the transmission of depth data alongside conventional 2D video. The additional depth information allows to synthesize arbitrary viewpoints at the receiver and enables adaptation of the perceived depth impression and driving of multi-view auto-stereoscopic displays. In contrast to natural video signals, depth maps are characterized by piecewise smooth regions bounded by sharp edges along depth discontinuities. Conventional video coding methods tend to introduce ringing artifacts along these depth discontinuities, which lead to visually disturbing geometric distortions in the view synthesis process. Therefore, preserving the described signal characteristics of depth maps is a crucial requirement for new depth coding algorithms. In this paper a novel simplified intra-coding mode is presented, which works as an alternative coding path to the conventional transform-based intra coding scheme. The proposed intra coding mode yields up to 1.3% BD-rate savings in terms of total bitrate, including texture bitrate. An optional depth Lookup Table can further increase the bitrate reduction to 2.1%.

关键词： video coding depth map coding residual coding 3D video

来源：评论

学校读者我要写书评

暂无评论

Segmental Prediction for Video coding

引用

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY 2017年第11期27卷 2425-2436页

作者： Zhang, Kai An, Jicheng Huang, Han Lin, Jian-Liang Huang, Yu-Wen Lei, Shaw-Min Mediatek Inc Beijing 100015 Peoples R China Qualcomm Inc San Diego CA 92121 USA Huawei Technol Co Ltd Beijing 100085 Peoples R China Mediatek Inc Hsinchu 30078 Taiwan

The emerging standards for screen content coding (SCC) and 3D video coding known as High Efficiency Video coding (HEVC)-SCC and 3D-HEVC, respectively, have been developed as extensions of HEVC. Compared with camera-captured video, screen content video and depth maps usually contain significantly fewer colors or sample intensities and much sharper edges in a frame. In this paper, a new coding method named segmental prediction is proposed to code screen content and depth maps more efficiently. First, samples in a prediction block are classified into several segments according to the sample intensities. Second, a particular predictor is calculated for each segment. Then an offset for a segment is derived at the encoder side and signaled to the decoder side. Finally, a single sample value is assigned to each segment in the reconstructed block. The experimental results show that the proposed approach can achieve a 2.2% average Bjontegaard Distortion-rate (BD-rate) saving under the HEVC-SCC common test conditions (CTCs) for sequences of the category YUV, text and graphics with motion, 1080p, with the all intra configuration. It can also achieve a 0.6% average BD-rate saving for synthesized views under the 3D-HEVC CTCs with the random access configuration.

关键词： 3D-High Efficiency Video coding (HEVC) depth map coding HEVC-screen content coding (SCC) segmental prediction

来源：评论

学校读者我要写书评

暂无评论

depth map compression via 3D region-based representation

引用

MULTIMEDIA TOOLS AND APPLICATIONS 2017年第12期76卷 13761-13784页

作者： Maceira Duch, Marc Morros, Josep-Ramon Ruiz-Hidalgo, Javier Univ Politecn Cataluna Image Proc Grp Barcelona Spain Univ Politecn Cataluna Teaching Telecommun Barcelona Spain Univ Politecn Cataluna Area Digital Image Proc Barcelona Spain Univ Politecn Cataluna Area Comp Vis Barcelona Spain

In 3D video, view synthesis is used to create new virtual views between encoded camera views. Errors in the coding of the depth maps introduce geometry inconsistencies in synthesized views. In this paper, a new 3D plane representation of the scene is presented which improves the performance of current standard video codecs in the view synthesis domain. Two image segmentation algorithms are proposed for generating a color and depth segmentation. Using both partitions, depth maps are segmented into regions without sharp discontinuities without having to explicitly signal all depth edges. The resulting regions are represented using a planar model in the 3D world scene. This 3D representation allows an efficient encoding while preserving the 3D characteristics of the scene. The 3D planes open up the possibility to code multiview images with a unique representation.

关键词： depth map coding 3D representation Image segmentation Data compression

来源：评论

学校读者我要写书评

暂无评论

Improved Reconstruction of Downsampled MV-HEVC depth Video 17

Improved Reconstruction of Downsampled MV-HEVC Depth Video

引用

IEEE EUROCON -17th International Conference on Smart Technologies

作者： Zammit, Luke Debono, Carl James Univ Malta Dept Commun & Comp Engn Msida Malta

ISBN: (纸本)9781509038435

The multiview video-plus-depth format provides a promising solution for the transmission of three-dimensional video. This format can be transmitted using the multiview high efficiency video coding (MV-HEVC) standard, where the texture and the depth videos are encoded and transmitted separately. The depth maps have large homogeneous areas making their downsampling before transmission and their upsampling at the receiver an attractive option to reduce bandwidth requirements. However, this process results in distortions of the sharp edges also characteristic of depth maps, causing artefacts in the synthesized views. This work exploits the edges found in the corresponding texture view and uses a novel edge detection and depth map painting algorithm to improve the reconstruction of the edges in the upsampled depth maps. Test results show that this solution can improve the quality of depth maps by up to 2.35dB compared to other methods found in literature.

关键词： 3D video coding depth map coding edge reconstruction multiview video MV-HEVC

来源：评论

学校读者我要写书评

暂无评论

BLOCK-ADAPTIVE PALETTE-BASED PREDICTION FOR depth map coding

BLOCK-ADAPTIVE PALETTE-BASED PREDICTION FOR DEPTH MAP CODING

引用

18th IEEE International Conference on Image Processing (ICIP)

作者： Shimizu, Shinya Kimata, Hideaki Sugimoto, Shiori Matsuura, Norihiko NTT Corp NTT Cyber Space Labs Tokyo Japan

ISBN: (纸本)9781457713033

This paper proposes a novel prediction scheme for depth map coding. We utilize the fact that depth values are largely dependent on objects and one small block consists of only a small number of objects at most. The proposed method approximates each block with one palette and one object shape map. The palette consists of two representative depth values for foreground object and background object in the target block. The object shape map expresses which object exists at each pixel. These data are encoded only at the blocks where the proposed method is used. In order to reduce the bitrates required to transfer palettes and object shape maps, the proposed method enables their prediction by utilizing spatial and temporal correlations. Experiments are conducted on three kinds of depth maps;estimated from multiview images, captured by special sensors, and generated by computer. The results show that the proposed method reduces the bitrate by up to 40% and about 20% on average for 13 sequences relative to the MPEG-4 AVC/H.264

关键词： depth map coding palette-based prediction shape coding 3D video

来源：评论

学校读者我要写书评

暂无评论

Texture video-assisted motion vector predictor for depth map coding

引用

OPTICAL ENGINEERING 2011年第8期50卷 080504-080504页

作者： Liu, Xiaoxian Chang, Yilin Li, Zhibin Huo, Junyan Xidian Univ State Key Lab ISN Xian 710071 Shaanxi Peoples R China

A texture video-assisted motion vector predictor for depth map coding is proposed in this letter. Based on the analyses of motion similarity between texture videos and their corresponding depth maps, the proposed approach uses the motion vectors of texture videos and the median predictor jointly to determine the optimal predicted motion vector for depth map coding by employing a rate-distortion (R-D) criterion. Experimental results demonstrate that compared with the median predictor utilized in H.264/AVC, the proposed method can save the maximum and average bit rate as high as 4.89% and 3.68%, respectively, while guaranteeing the quality of synthesized virtual views. (C) 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.3615644]

关键词： H.264/AVC predicted motion vector depth map coding

来源：评论

学校读者我要写书评

暂无评论

Low complexity depth mode decision for HEVC-based 3D video coding

引用

OPTIK 2016年第11期127卷 4758-4767页

作者： Chen, Ming Yang, Yongshuang Zhang, Qiuwen Zhao, Xiaoxin Huang, Xinpeng Gan, Yong Zhengzhou Univ Light Ind Software Engn Cll Zhengzhou 450002 Peoples R China Zhengzhou Univ Light Ind Coll Comp & Commun Engn 5 Dongfeng Rd Zhengzhou 450002 Peoples R China

The emerging international standard high efficiency video coding (HEVC) based 3D video coding (3D-HEVC) was recently standardized by the Joint Collaborative Team on 3D video coding (JCT-3V) as an extension of HEVC for coding the multi-view video plus depth content. In test model of 3D-HEVC, new depth inter and intra modes including disparity estimation (DE), depth modeling modes (DMM) and region boundary Chain coding (RBC) are exploited for depth map coding. These new inter and intra modes achieve the highest possible coding efficiency, but it results in extremely large encoding time which obstructs 3D-HEVC from practical application. In this paper, we propose a low complexity depth mode decision algorithm for both inter and intra prediction to reduce the computational complexity of 3D-HEVC. The basic idea of the proposed algorithm is to utilize the depth map changes characteristic to predict the current depth treeblock prediction mode and early skip unnecessary inter and intra modes, such as DE, DMM and RBC. Experimental results show that the proposed low complexity algorithm can reduce the encoding time by up to 35% for 3D-HEVC mode decision, with negligible loss of rate-distortion (RD) performance. (C) 2016 Elsevier GmbH. All rights reserved.

关键词： 3D-HEVC depth map coding Mode decision

来源：评论

学校读者我要写书评

暂无评论

Efficient Lagrange multiplier selection algorithm for depth maps coding

引用

ELECTRONICS LETTERS 2016年第20期52卷 1681-U35页

作者： Huo, Junyan Mo, Dongchun Yang, Fuzheng Lin, Weisi Xidian Univ State Key Lab Integrated Serv Networks Xian 710071 Peoples R China Nanyang Technol Univ Sch Comp Sci & Engn Singapore 639798 Singapore

The rate-distortion optimisation criterion of depth maps coding is evaluated by virtual view distortion, which motivates research modelling the distortion and corresponding Lagrange multiplier for depth maps coding. Current studies follow the assumption that the virtual view distortion introduced by texture videos distortion and depth maps distortion can be explored separately. Then the texture-videos-distortion-induced virtual view distortion is considered as a constant value during depth maps coding. A relationship between the optimal Lagrange multiplier of depth maps and texture videos distortion is investigated. Based on this relationship, an efficient Lagrange multiplier selection algorithm is proposed for depth maps coding based on quantisation parameters of texture videos and depth maps. With the proposed Lagrange multiplier, 1.36% bitrate saving with the same virtual view quality can be achieved compared with 3D high efficiency video coding reference software.

关键词： rate distortion theory video coding rate-distortion optimisation criterion virtual view distortion quantisation parameters Lagrange multiplier selection algorithm depth map distortion texture video distortion depth map coding

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：