检索结果-内蒙古大学图书馆

CNN-LNN Based Fast CU Partitioning Decision for VVC 3D Video depth map Intra coding

IEEE ACCESS 2023年 11卷 87420-87429页

作者： Wang, Fengqin Wang, Zhiying Zhang, Qiuwen Zhengzhou Univ Light Ind Coll Comp & Commun Engn Zhengzhou 450002 Peoples R China

Currently, the coding efficacy of the cutting-edge video coding standard H.266/VVC surpasses that of 3D-HEVC (3D-High Efficiency Video coding), but the existing VVC (Versatile Video coding) low-complexity coding algorithm is mainly optimized for 2D video coding and cannot fully utilize the characteristics of the depth map itself. Based on this, we propose a fast decision algorithm employing the CNN (Convolutional Neural Network)-LNN (Lightweight Neural Network) model to diminish the intricacy of depth map intra coding in VVC 3D video. The algorithm treats the CU partitioning process in depth map coding as a two-stage process, first adding a non-local block and spatial pyramid pooling to the CNN model, enabling the proposed CNN model to skip the flat regions in the depth map and perform adaptive partitioning prediction of CUs in the edge regions;then, the LNN model is used to make early decision on TT (Ternary Tree) partition for CUs that need to be partitioned, and skip decisions for CUs that do not need to be partitioned by TT, so as to reduce some unnecessary RDO calculations. Experimental results illustrate that the algorithm achieves a notable reduction in encoding time amounting to 43.23% on average, with a negligible impact on the increase of BDBR.

关键词： VVC 3D video depth map coding CU early prediction CNN-LNN

来源：评论

学校读者我要写书评

暂无评论

PREDICTIVE depth map coding FOR EFFICIENT VIRTUAL VIEW SYNTHESIS

PREDICTIVE DEPTH MAP CODING FOR EFFICIENT VIRTUAL VIEW SYNTH...

引用

IEEE International Conference on Image Processing

作者： Luís F. R. Lucas Nuno M. M. Rodrigues Carla L. Pagliari Eduardo A. B. da Silva Sérgio M. M. de Faria Instituto de Telecomunica??es DEE Instituto Militar de Engenharia PEE/COPPE/DEL/Poli Univ. Federal do Rio de Janeiro Brazil

ISBN: (纸本)9781479923427

This paper presents a novel approach to compress depth maps envisioned for virtual view synthesis. This proposal uses a sophisticated prediction model, combining the HEVC intra prediction modes with a flexible partitioning scheme. It exhaustively evaluates the prediction modes for a large amount of block sizes, in order to find the minimum coding cost for each depth map block. Unlike HEVC, no transform is used, the residue being trivially encoded through the transmission of just its mean value. The experimental results show that, when the encoding evaluation metric is the quality of the view synthesized using the encoded depth map against the map encoding rate, the proposed algorithm generates reconstructed depth maps that provide, for most bitrates, some of the best performances among state-of-the-art depth maps encoders. In addition, it runs approximately as fast as the HEVC HM.

关键词： depth map coding predictive coding flexible block segmentation depth image based rendering

来源：评论

学校读者我要写书评

暂无评论

View Synthesis Oriented depth map coding Algorithm

View Synthesis Oriented Depth Map Coding Algorithm

引用

2009 Asia-Pacific Conference on Information Processing

作者： Bo Zhu, Gangyi Jiang, Yun Zhang Faculty of Information Science and Engineering, Ningbo University, Ningbo, 315211, China Zongju Peng, Mei Yu National Key Lab of Software New Technology, Nanjing University, Nanjing, 210093, China

A view synthesis-oriented depth map coding algorithm is proposed in this paper. depth map is classified into inner motion regions, background subtracted with edges and edge regions by using edge detection of current depth map and the frame difference between corresponding color images. Then macroblocks in different regions are encoded with different RDO schemes so as to speed up the encoding process while keep the quality of reconstructed depth map. Experimental results show that the proposed method not only improves the encoding speed significantly, but also saves bitrate of depth map sequence while maintaining high quality of synthesized virtual view images.

关键词： multi-view video view synthsis depth map coding motion region

来源：评论

学校读者我要写书评

暂无评论

Region-based depth map coding using a 3D scene representation

Region-based depth map coding using a 3D scene representatio...

引用

IEEE International Conference on Acoustics, Speech and Signal Processing

作者： M. Maceira J. R. Morros J. Ruiz-Hidalgo Dept. of Signal Theor. & Commun. Univ. Politec. de Catalunya (UPC) Barcelona Spain

ISBN: (纸本)9781467369985

In 3D video, view synthesis is used to process 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 3D plane representation of the scene is presented which improve the performance of current standard video codecs in the view synthesis domain. depth maps are segmented into regions without sharp edges and represented with a plane in the 3D world scene coordinates. This 3D representation allows an efficient representation while preserving the 3D characteristics of the scene. Experimental results are provided obtaining gains from 10 to 40 % in bitrate compared to HEVC.

关键词： 3D video 3dtv depth map coding video codecs Bit rate STRUCTURE map View Three Dimensions plane Platanus hybrida High efficiency video coding

来源：评论

学校读者我要写书评

暂无评论

Fractal depth map Sequence coding Algorithm with Motion-vector-field-based Motion Estimation

引用

KSII TRANSACTIONS ON INTERNET AND INFORMATION SYSTEMS 2015年第1期9卷 242-259页

作者： Zhu, Shiping Zhao, Dongyu Beihang Univ Sch Instrumentat Sci & Optoelect Engn Dept Measurement Control & Informat Technol Beijing 100191 Peoples R China

Three-dimensional video coding is one of the main challenges restricting the widespread applications of 3D video and free viewpoint video. In this paper, a novel fractal coding algorithm with motion-vector-field-based motion estimation for depth map sequence is proposed. We firstly add pre-search restriction to rule the improper domain blocks out of the matching search process so that the number of blocks involved in the search process can be restricted to a smaller size. Some improvements for motion estimation including initial search point prediction, threshold transition condition and early termination condition are made based on the feature of fractal coding. The motion-vector-field-based adaptive hexagon search algorithm on the basis of center-biased distribution characteristics of depth motion vector is proposed to accelerate the search. Experimental results show that the proposed algorithm can reach optimum levels of quality and save the coding time. The PSNR of synthesized view is increased by 0.56 dB with 36.97% bit rate decrease on average compared with H.264 Full Search. And the depth encoding time is saved by up to 66.47%. Moreover, the proposed fractal depth map sequence codec outperforms the recent alternative codecs by improving the H.264/AVC, especially in much bitrate saving and encoding time reduction.

关键词： Fractal coding depth map coding 3D video motion estimation Hexagon Search

来源：评论

学校读者我要写书评

暂无评论

ESTIMATION OF END-TO-END DISTORTION OF VIRTUAL VIEW FOR ERROR-RESILIENT depth map coding

ESTIMATION OF END-TO-END DISTORTION OF VIRTUAL VIEW FOR ERRO...

引用

IEEE International Conference on Image Processing

作者： Min Gao Xiaopeng Fan Debin Zhao Feng Jiang Wen Gao Dept. of Computer Science and Technology Harbin Institute of Technology Harbin China

ISBN: (纸本)9781479923427

In this paper, we propose to estimate the end-to-end distortion of virtual view for error-resilient depth map coding by analyzing the view-rendering process. The end-to-end distortion is estimated according to the expectation of depth distortion. The expectation of depth distortion is estimated based on the error-propagated distortion from the reference frame, which is calculated recursively for each pixel by considering the source characteristics, channel condition and error concealment method. The error-propagated distortion in terms of each frame is updated after the frame is encoded, which is used for the subsequent frames. Experimental results demonstrate that the proposed algorithm achieves substantial and consistent gains in comparison with the random intra updating method and the conventional rate-distortion method for error-resilient depth map coding.

关键词： depth map coding error-resilient coding end-to-end distortion virtual view

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

H.264-based depth map-sequence coding algorithm using mode mapping for fast 3-D video compression

引用

OPTICAL ENGINEERING 2011年第1期50卷 017401-017401页

作者： Pan, Ling-Jiao Lee, Byung-Tak Kim, Nac-Woo Elect & Telecommun Res Inst Opt Commun Res Ctr Kwangju 500480 South Korea

An H.264-based fast 3-D video compression algorithm is presented by reducing coding complexity of P slices in a depth map sequence using a fast-mode decision scheme. On the basis of the relationship of coding modes of collocated macroblocks on texture and depth frames, an early SKIP-mode decision scheme and a selective prediction-mode decision scheme have been developed to rapidly encode depth map sequences. Experimental results show that the algorithm can save the entire encoding time by 79% on average compared to conventional a depth map sequence coding algorithm, while introducing only negligible loss in peak signal-to-noise ratio value. (C) 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.3533026]

关键词： 3-DTV H.264 depth map coding

来源：评论

学校读者我要写书评

暂无评论

NON-ESSENTIALITY OF CORRELATION BETWEEN IMAGE AND depth map IN FREE VIEWPOINT IMAGE coding: ACCURATE depth map CASE

NON-ESSENTIALITY OF CORRELATION BETWEEN IMAGE AND DEPTH MAP ...

引用

3DTV-Conference on True Vision - Capture, Transmission and Display of 3D Video (3DTV-CON)

作者： Inoue, Tomohiko Fukushima, Norishige Ishibashi, Yutaka Nagoya Inst Technol Grad Sch Engn Showa Ku Nagoya Aichi 4668555 Japan

ISBN: (纸本)9781479947584

We show non-essentiality of using a correlation between an image and a depth map for depth-image-based rendering (DIBR), when we use an accurate depth map. For coding of DIBR, an edge preserving filter, which jointly use the image and the depth map, as a post filter is a suitable approach. The joint filter not only removes coding distortion, but also improves accuracy of the coded depth map itself. Considering the development 3D technology, the accuracy of the input depth map will be improved. If we use an accurate depth map, e.g. the ground truth, the accuracy improvement of the joint filter becomes little. To reveal the fact, we use various codecs (JPEG, JPEG2000, and H.264/AVC) and use two state-of-the-arts filters, which are the post filter set as the non-joint filter, and the weighed mode filter as the joint filter. Experimental results show that the post filters do not require the joint image, and self-sustained types of the non-joint filter have better performance.

关键词： depth map coding Post Filtering depth Image Based Rendering Free Viewpoint Image Synthesis

来源：评论

学校读者我要写书评

暂无评论

RESIDUAL coding OF depth map WITH TRANSFORM SKIPPING

RESIDUAL CODING OF DEPTH MAP WITH TRANSFORM SKIPPING

引用

IEEE Visual Communications and Image Processing (VCIP)

作者： Lee, Cheon Wey, Hocheon Lee, Jaejoon Ho, Yo-Sung Gwangju Inst Sci & Technol Kwangju South Korea Samsung Adv Inst Technol Seoul South Korea

ISBN: (纸本)9781467344050;9781467344067

Since advanced 3D video systems employ depth information to support free-viewpoint navigation and comfortable 3D video viewing, efficient depth map coding is necessary for future 3D video systems. Most residual data in depth map coding are generated along abrupt depth discontinuities, represented by near-zero and high-magnitude values. In this paper, we model the residual data with two representative values calculated by the K-means clustering method and send them to the decoder by skipping transformation. After best mode decision, we applied the proposed method to a block containing residual data, and then we send the quantized representative values to decoder if its coding rate is less than the conventional best mode. By conducting INTRA only coding, -20.32% bit saving was achieved.

关键词： 3D video coding depth map coding residual coding K-means clustering

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：