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

作者： Avci, Aykut De Cock, Jan Beernaert, Roel De Smet, Jelle Bogaert, Lawrence Meuret, Youri Thienpont, Hugo Lambert, Peter De Smet, Herbert Univ Ghent Dept Elect & Informat Syst Ctr Microsyst Technol Technol Pk 914 B-9052 Ghent Belgium Univ Ghent IBBT Dept Elect & Informat Syst Multimedia Lab B-9050 Ghent Belgium Vrije Univ Brussel Dept Appl Phys & Photon B-1050 Brussels Belgium Imec Cmst B-9052 Ghent Belgium

ISBN: (纸本)9781612841625

As the number of views comprised in multi-view videos increases, some challenging problems emerge. Besides the bandwidth problems caused by the huge data flow, the calculation power needed by the multi-view encoder is an even higher burden than that of a single view encoder. In this paper, a complexity efficient way to encode a single-time instant of 5x3 view frames is presented. Some of the P frames known from the traditional encoding schemes have been replaced by a new type of frame called the D frame, in which the disparity vector of a block in a view can be derived from the other views due to the strong geometrical correspondence existing between adjacent views. Experimental results show that 20.2% complexity gain is achieved without compromising quality and bit-rate by wisely selecting threshold values at different QPs.

关键词： multi-view video coding camera array disparity vector encoder complexity

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Research on effective coding algorithm for multi-view video

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OPTIK 2015年第19期126卷 2090-2093页

作者： Feng, Gui Huang, Jun-ting Huaqiao Univ Coll Informat Sci & Engn Xiamen 361021 Peoples R China

Based on deeply analyzing and studying of multi-view video coding technology in JMVC (Joint multi-view video coding), an effective coding algorithm in views of model decision and fast block searching was put forward in this paper. First, we use different search algorithms for interview prediction and frame prediction, respectively, to reduce search time and improve search efficiency. Second, we analyze the relationship among the model of current macroblock, the model of adjacent coded macroblocks and the corresponding position of reference frame. According to the result we can optimize the model decision algorithm for current coding macroblock, and reduce the search time for refined small block. The improved fast search algorithm is effective to the sequences containing fast motion area, and the improved model decision algorithm is effective to the sequences containing slow motion. Therefore, we combine the two improved algorithms, and apply them to sequences with different characteristics. The experimental results show that the improved algorithms get significant improvement in coding effect. Compared with the original algorithm in JMVC, the improved algorithm can reduce the coding time by 84.5% under the premise of insuring reconstruction video quality and coding overhead. (C) 2015 Elsevier GmbH. All rights reserved.

关键词： multi-view video coding Model decision Fast searching coding time

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Rate-distortion-optimized multi-view streaming in wireless environment using network coding

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EURASIP JOURNAL ON ADVANCES IN SIGNAL PROCESSING 2016年第1期2016卷 1页

作者： Greco, Claudio Nemoianu, Irina D. Cagnazzo, Marco Pesquet-Popescu, Beatrice DxO Paris France I3S CNRS UNSA Sophia Antipolis France Univ Paris Saclay Telecom ParisTech CNRS LTCI F-75013 Paris France

multi-view video streaming is an emerging video paradigm that enables new interactive services, such as 3D video, free viewpoint television, and immersive teleconferencing. Because of the high bandwidth cost they come with, multi-view streaming applications can greatly benefit from the use of network coding, in particular in transmission scenarios such as wireless network, where the channels have limited capacity and are affected by losses. In this paper, we address the topic of cooperative streaming of multi-view video content, wherein users who recently acquired the content can contribute parts of it to their neighbors by providing linear combinations of the video packets. We propose a novel method for selection and network encoding of the transmitted frames based on the users' preferences for the different views and the rate-distortion properties of the stream. Using network coding enables the users to retrieve the content in a faster and more reliable manner and without the need for coordination among the senders. Our experimental results prove that our preference-based approach provides a high-quality decoding even when the uplink capacity of each node is only a small fraction of the rate of the stream.

关键词： multi-view video coding Network coding video streaming

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3DoF+360 video Location-Based Asymmetric Down-Sampling for view Synthesis to Immersive VR video Streaming

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SENSORS 2018年第9期18卷 3148-3148页

作者： Jeong, JongBeom Jang, Dongmin Son, Jangwoo Ryu, Eun-Seok Gachon Univ Dept Comp Engn Seongnam 13120 South Korea

Recently, with the increasing demand for virtual reality (VR), experiencing immersive contents with VR has become easier. However, a tremendous amount of calculation and bandwidth is required when processing 360 videos. Moreover, additional information such as the depth of the video is required to enjoy stereoscopic 360 contents. Therefore, this paper proposes an efficient method of streaming high-quality 360 videos. To reduce the bandwidth when streaming and synthesizing the 3DoF+ 360 videos, which supports limited movements of the user, a proper down-sampling ratio and quantization parameter are offered from the analysis of the graph between bitrate and peak signal-to-noise ratio. High-efficiency video coding (HEVC) is used to encode and decode the 360 videos, and the view synthesizer produces the video of intermediate view, providing the user with an immersive experience.

关键词： virtual reality 3DoF+ HEVC view synthesis VSRS multi-view video coding

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multi-view video coding with view interpolation prediction for 2D camera arrays

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JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION 2010年第5-6期21卷 474-486页

作者： Chung, Tae-Young Jung, Il-Lyong Song, Kwanwoong Kim, Chang-Su Korea Univ Sch Elect Engn Seoul South Korea

An efficient compression algorithm for multi-view video sequences, which are captured by two-dimensional (2D) camera arrays, is proposed in this work. First, we propose a novel prediction structure, called three-dimensional hierarchical B prediction (3DHBP), which can efficiently reduce horizontal inter-view redundancies, vertical inter-view redundancies, and temporal redundancies in multi-view videos. Second, we develop a view interpolation scheme based on the bilateral disparity estimation. The interpolation scheme yields high quality view frames by adapting disparity estimation and compensation procedures using the information in neighboring frames. Simulation results demonstrate that the proposed multi-view video coding algorithm provides significantly better rate-distortion (R-D) performance than the conventional algorithm, by employing the 3DHBP structure and using interpolated view frames as additional reference frames. 2009 Elsevier Inc. All rights reserved.

关键词： multi-view video coding Hierarchical B prediction view interpolation Bilateral criterion 2D camera array 3D-TV H.264/AVC

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HEVC-based view Level Rate-distortion Model for multiview video 25

HEVC-based View Level Rate-distortion Model for Multiview Vi...

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25th Iranian Conference on Electrical Engineering (ICEE)

作者： Tajali, Behrad Roodaki, Hoda KN Toosi Univ Technol Fac Comp Engn Tehran Iran

ISBN: (纸本)9781509059638

The multiview extension of HEVC (MV-HEVC) with an ever increasing number of coding parameters allows much better coding performance compared to the previous multiview video coding standards. Usually, controlling the various coding parameters in a video coding standard to obey the rate constraints in various applications is a major challenge. Rate Control Algorithms (RCA) is used in video coding standards to control the coding parameters to satisfy different rate constraints. Although RCA is not part of a video coding standard but the specific features or aspects of the video coding standard can improve its efficiency considerably. In this paper, we propose a method to investigate the effect of a new feature of MV-HEVC, namely Advanced Motion Vector Prediction (AMVP), to improve the efficiency of the corresponding rate control algorithm. Rate control algorithms usually utilize a rate-distortion (RD) model as a basic tool to describe the relationship between the rate and the quality of the encoded video. We will show that considering the aforementioned feature of MV-HEVC video coding standard as a view-level RD model parameter can improve the effectiveness of the RD model. Evaluation results indicate that using this new feature of MV-HEVC in view-level RD model, we can predict the rate of each view with relatively high precision and a low estimation error of 11% on average.

关键词： MV-HEVC multi-view video coding rate-distortion model inter-view motion prediction

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3D scene reconstruction based on multi-view distributed video coding in the Zernike domain for mobile applications

3D scene reconstruction based on multi-view distributed vide...

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Conference on multimedia on Mobile Devices and multimedia Content Access - Algorithms and Systems V

作者： Palma, V. Carli, M. Neri, A. Univ Roma TRE Dept Appl Elect Rome Italy

ISBN: (纸本)9780819484185

In this paper a multi-view Distributed video coding scheme for mobile applications is presented. Specifically a new fusion technique between temporal and spatial side information in Zernike Moments domain is proposed. Distributed video coding introduces a flexible architecture that enables the design of very low complex video encoders compared to its traditional counterparts. The main goal of our work is to generate at the decoder the side information that optimally blends temporal and interview data. multi-view distributed coding performance strongly depends on the side information quality built at the decoder. At this aim for improving its quality a spatial view compensation/prediction in Zernike moments domain is applied. Spatial and temporal motion activity have been fused together to obtain the overall side-information. The proposed method has been evaluated by rate-distortion performances for different inter-view and temporal estimation quality conditions.

关键词： multi-view video coding Zernike moments distributed video coding

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Distributed coding Scheme for multi-view video through Efficient Side Information Generation

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JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY 2014年第5期9卷 1762-1773页

作者： Yoo, Jihwan Ko, Min Soo Kwon, Soon Chul Seo, Young-Ho Kim, Dong-Wook Yoo, Jisang Kwangwoon Univ Dept Elect Engn Seoul South Korea LG Elect Inc Seoul South Korea Kwangwoon Univ Dept Informat & Contents Seoul South Korea Kwangwoon Univ Coll Liberal Arts Seoul South Korea Kwangwoon Univ Dept Elect Mat Engn Seoul South Korea

In this paper, a distributed image coding scheme for multi-view video through an efficient generation of side information is proposed. A distributed video coding technique corrects the errors in the side information, which is generated with the original image, by using the channel coding technique at the decoder. Therefore, the more correct the generated side information is, the better the performance of distributed video coding. The proposed technique is to apply the distributed video coding schemes to the image coding for multi-view video. It generates side information by selectively and efficiently using both 3-dimensional warping based on the depth map with spatially adjacent frame's and motion-compensated temporal interpolation with temporally adjacent frames. In this scheme the difference between the adjacent frames, the sizes of the motion vectors for the adjacent blocks, and the edge information are used as the selection criteria. From the experiments, it was observed that the quality of the side information generated by the proposed technique was improved by the average peak signal-to-noise ratio of 0.97dB than the one by motion-compensated temporal interpolation or 3-dimensional warping. The result from analyzing the rate-distortion curves revealed that the proposed scheme could reduce the bit-rate by 8.01% on average at the same peak signal-to-noise ratio value, compared to previous work.

关键词： Distributed video coding multi-view video coding Side information Depth map 3D warping

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A motion vector prediction method for multi-view video coding

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JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION 2010年第7期21卷 677-681页

作者： Lee, Sang Heon Lee, Sang Hwa Yang, Jeong Hyu Cho, Nam Ik Seoul Natl Univ Inst New Media & Commun San 56-1 Shilim Dong Gwanak Gu South Korea LG Elect DTV Lab Gwanak Gu South Korea

This paper proposes a new motion vector (MV) prediction method in multi-view video coding (MVC). In order to exploit the information in adjacent views, inter-view MVs as well as temporal MVs are used in conventional MVC. Since the inter-view MVs are usually uncorrelated with the temporal MVs and most neighboring partitions have temporal MVs only, the conventional DPCM coding gain of inter-view MV is very low and thus the inter-view MVs are seldom selected. In order to increase the probability of interview MV selection, we define a virtual inter-view MV which can be generated from temporal MVs. Then, an inter-view MV is predicted using these neighboring virtual inter-view MVs, leading to less prediction error than using the temporal MVs. As a result, bit-rates are decreased by up to 9% for the view-temporal prediction structure. (C) 2010 Elsevier Inc. All rights reserved.

关键词： multi-view video coding Motion vector prediction Disparity vector prediction Inter-view prediction JMVM view-temporal prediction Probability of inter-view prediction Magnitude of MV prediction residual

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Early DIRECT Mode Decision for MVC Using MB Mode Homogeneity and RD Cost Correlation

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IEEE TRANSACTIONS ON BROADCASTING 2016年第3期62卷 700-708页

作者： Li, Yue Yang, Gaobo Chen, Ning Zhu, Yapei Ding, Xiangling Hunan Univ Sch Informat Sci & Engn Changsha 410082 Hunan Peoples R China Hengyang Normal Univ Fac Phys & Elect Informat Sci Hengyang 421002 Peoples R China

multi-view video coding (MVC) adopts variable size mode decision to achieve high coding efficiency. However, its high computational complexity is a bottleneck of enabling MVC into practical real-time applications. In this paper, an early termination strategy is proposed for DIRECT mode decision of MVC by exploiting mode homogeneity and rate distortion (RD) cost correlation. By comparing the RD cost between DIRECT mode and Inter16x16 mode, an adaptive threshold is defined based on the MB's mode homogeneity and RD cost so as to early terminate the remaining inter and intra modes. Experimental results show that compared with the original JMVC model, the proposed approach can reduce the total encoding time from 65.08% to 91.45% (80.43% on average). Meanwhile, the Bjontegaard delta peak signal-to-noise ratio only decreases 0.031 dB and Bjontegaard delta bit rate increases 0.97% on average, which is a negligible loss of coding efficiency and superior to the performance of state-of-the-art methods.

关键词： DIRECT mode decision mode homogeneity RD cost multi-view video coding

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