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Seamless Content Delivery over Mobile 3G+/4G Networks

MOBILE NETWORKS & APPLICATIONS 2011年第3期16卷 351-360页

作者： Zahariadis, Theodore Grueneberg, Karsten Celetto, Luca Synelixis Solut Chalkida 34100 Greece Fraunhofer Heinrich Hertz Inst D-10587 Berlin Germany ST Microelect I-20141 Agrate Brianza Italy

Widespread and affordable mobile broadband access opens up opportunities for delivery of new streaming services everywhere and anytime. However, what is expected to fundamentally change the way how people use the network is the ability to produce, and seamlessly deliver and share their own multimedia content. In this paper we describe the content distribution and adaptation architecture that we have implemented and tested, the results utilising new coding formats of video coding (e.g. SVC, MVC) and new methods for increasing the robustness of video delivery.

关键词： scalable video coding multi-view coding multi-description coding cross layer adaptation 3G+/4G mobile networks

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A reversible video steganography algorithm for MVC based on motion vector

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multiMEDIA TOOLS AND APPLICATIONS 2015年第11期74卷 3759-3782页

作者： Song, Guanghua Li, Zhitang Zhao, Juan Hu, Jun Tu, Hao Huazhong Univ Sci & Technol Dept Comp Sci & Technol Wuhan 430074 Peoples R China Huazhong Univ Sci & Technol Network & Comp Ctr Wuhan 430074 Peoples R China

In this paper we present a reversible video steganography scheme for hiding secret data into the motion vector of each block in 3D MVC videos. Under this approach the idea of the inner product is introduced to achieve reversibility. By establishing the inner product between the motion vector and the modulation vector and setting the embedding conditions, we embed 1 bit data into each motion vector and the proposed algorithm is reversible. Moreover, in order to avoid distortion drift, we only embed data into b4-frames with the coding feature of 3D MVC videos. Experimental results also confirm that the proposed scheme can provide expected acceptable video quality of stegovideos and successfully achieve reversibility.

关键词： Reversible video steganography multi-view coding Motion vector Inner product Distortion drift

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Depth map creation and image-based rendering for advanced 3DTV services providing interoperability and scalability

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SIGNAL PROCESSING-IMAGE COMMUNICATION 2007年第2期22卷 217-234页

作者： Kauff, P. Atzpadin, N. Fehn, C. Mueller, M. Schreer, O. Smolic, A. Tanger, R. Heinrich Hertz Inst Nachrichtentech Berlin GmbH Fraunhofer Inst Telecommun D-10587 Berlin Germany

Due to enormous progress in the areas of auto-stereoscopic 3D displays, digital video broadcast and computer vision algorithms, 3D television (3DTV) has reached a high technical maturity and many people now believe in its readiness for marketing. Experimental prototypes of entire 3DTV processing chains have been demonstrated successfully during the last few years, and the motion picture experts group (MPEG) of ISO/IEC has launched related ad hoe groups and standardization efforts envisaging the emerging market segment of 3DTV. In this context the paper discusses all advanced approach for a 3DTV service, which is based on the concept of video-plus-depth data representations. It particularly considers aspects of interoperability and multi-view adaptation for the case that different multi-baseline geometries are used for multi-view capturing and 3D display. Furthermore it presents algorithmic solutions for the creation of depth maps and depth image-based rendering related to this framework of multi-view adaptation. In contrast to other proposals, which are more focused on specialized configurations, the underlying approach provides a modular and flexible system architecture supporting a wide range of multi-view structures. (C) 2007 Elsevier B.V. All rights reserved.

关键词： 3DTV interoperability multi-view adaptation disparity matching multi-baseline stereo depth image-based rendering multi-view coding auxiliary video data representation

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Robust transmission of multi-view video streams using flexible macroblock ordering and systematic LT codes

Robust transmission of multi-view video streams using flexib...

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1st International Conference on 3DTV

作者： Argyropoulos, S. Tan, A. S. Thomos, N. Arikan, E. Strintzis, M. G. Univ Thessaloniki Dept Elect & Comp Engn Hellas Greece Bilkent Univ Dept Elect & Elect Engn Ankara Turkey Ecole Polytech Fed Lausanne Signal Proc Inst ITS Lausanne Switzerland Informat & Telemat Inst Thessaloniki Greece

ISBN: (纸本)9781424407217

The transmission of fully compatible H.264/AVC multi-view video coded streams over packet erasure networks is examined. Macroblock classification into unequally important slice groups is considered using the Flexible Macroblock Ordering (FMO) tool of H.264/AVC. Systematic IT codes are used for error protection due to their low complexity and advanced performance. The optimal slice grouping and channel rate allocation are jointly determined by an iterative optimization algorithm based on dynamic programming. The experimental evaluation clearly demonstrates the validity of the proposed method.

关键词： multi-view coding FMO fountain codes LT codes unequal error protection

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A Data Hiding Algorithm for 3D Videos Based on Inter-MBs

A Data Hiding Algorithm for 3D Videos Based on Inter-MBs

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10th International Conference on Intelligent Computing (ICIC)

作者： Song, Guanghua Li, Zhitang Zhao, Juan Zou, Mingguang Huazhong Univ Sci & Technol Dept Comp Sci & Technol Wuhan 430074 Peoples R China

ISBN: (纸本)9783319093338;9783319093321

Distortion drift, including intra-frame and inter-frame, is a big problem of data hiding in 3D video streams. With the analysis of the coding structure of MVC videos, we propose a new data hiding algorithm without inter-frame and intra-frame distortion drift. Firstly, an ideal that modify the 4x4 QDCT coefficients of the inter-MBs except the rightmost column and the bottom row is proposed, and it can completely prevent intra-frame distortion drift. Then, we point out that hiding data into b4-frames can completely prevent inter-frame distortion drift. The algorithm has lower complexity and a greater embedding capacity than the current algorithms. Experimental results confirm the embedding capacity and complexity superiority of the proposed algorithm while keeping the similar human visual effect.

关键词： Data hiding multi-view coding Distortion drift

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A Video Steganography Algorithm for MVC Without Distortion Drift 4

A Video Steganography Algorithm for MVC Without Distortion D...

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International Conference on Audio, Language and Image Processing

作者： Song, Guanghua Li, Zhitang Zhao, Juan Tu, Hao Cheng, Junxia Huazhong Univ Sci & Technol Dept Comp Sci & Technol Wuhan Peoples R China

ISBN: (纸本)9781479939039

Distortion drift, including intra and inter, is a big problem of data hiding in MVC video streams. Based on the analysis of the coding structure of MVC, we proposed a video steganography algorithm without inter and intra distortion drift. We embed the data in the B4-frame to prevent the inter distortion drift, then modified the QDCT coefficients of all the 4x4 luma blocks and compensated them to prevent intra distortion drift. The algorithm has lower complexity and greater embedding capacity than the current algorithms. Experimental results confirm the embedding capacity and complexity superiority of the proposed algorithm while keeping the similar human visual effect in terms of PSNR and SSIM index.

关键词： Data hiding multi-view coding Distortion drift

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Optimized Adaptive Space-Time-view multi-Dimentional Error Concealment for 3D multi-view Video Transmission

Optimized Adaptive Space-Time-View Multi-Dimentional Error C...

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Saudi International Electronics, Communications and Photonics Conference (SIECPC)

作者： El-Shafai, Walid Menoufia Univ Fac Elect Engn Dept Elect & Elect Commun Engn Menoufia 32951 Egypt

ISBN: (纸本)9781467361958;9781467361965

3D multi-view Video (MVV) coded bit-streams that are transmitted over error prone channels can suffer from error propagation in the space, time and view domains. To improve the quality of reconstructed 3D MVV, we propose optimized Error Concealment (EC) algorithms to conceal the erroneous blocks of intra-coded and inter-coded frames. Our proposed algorithms adapt to the motion characteristics of the 3D MVV and to the error patterns. We propose three adaptive EC algorithms for intra-frames, which are Adaptive Time Domain Error Concealment (ATDEC), Adaptive Space Domain Error Concealment (ASDEC) and a hybrid Adaptive Space-Time Domain Error Concealment (ASTDEC). We also propose three adaptive EC algorithms for inter-frames, which are Adaptive Inter-view Domain Error Concealment (AIVDEC), Adaptive Time Domain Error Concealment (ATDEC) and joint Adaptive Time and Inter-view Domain Error Concealment (ATIVDEC). Our simulation results show that the proposed optimized EC algorithms can significantly improve the objective and subjective 3D MVV quality transmitted over error prone channels.

关键词： Error Concealment 3D Video multi-view coding Intra Frame Inter Frame Spatio-Temporal and Inter-view Correlation

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Adaptive Error Concealment Algorithm for multiview coding based on lost MBs sizes and using dynamic selection of lower candidates MBs

Adaptive Error Concealment Algorithm for Multiview Coding ba...

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8th International Computer Engineering Conference (ICENCO) - Today Information Society What's Next

作者： Ebian, Mohamed El-Sharkawy, Mohamed El-Ramly, Salwa Ain Shams Univ Fac Engn Elect & Commun Dept Cairo Egypt Japan Univ Sci & Technol Dept Elect Commun Engn Alexandria Egypt

ISBN: (纸本)9781467355667;9781467355650

multi-view video sequences are compressed using advanced high compression ratio tools called H.264/AVC multi-view coding (MVC). MVC is very sensitive to errors due to its structure as a result Error Concealment (EC) algorithms are developed at the decoder to improve the quality of decoded MVC frames. In this paper efficient multi-view EC algorithms are proposed for intra and inter MBs exploiting the spatial, temporal and inter-view information of neighboring MBs. For Intra MBs, Spatial-Inter view (SIV) algorithm is proposed. For inter MBs, the proposed algorithm is adaptively changed according to the lost MB size. In addition, the algorithm dynamically candidates MBs according to the current used view. Then the inter 16x16 MBs are enhanced by a new method called weighted block motion and disparity concealment (WBMDC). The other inter MBs types are enhanced using a proposed method called The Overlapped Block Motion Compensation (OBMC). It is shown that the proposed algorithm leads to better subjective quality in addition higher PSNR values. With applying the proposed algorithms, the gain is improved by up to 12.84 dB and 1.1 dB comparing to no applying any EC algorithms and applying normal EC algorithm respectively at 22% Loss Rate (LR).

关键词： multi-view coding Error Concealment Boundary Matching Algorithm Weighted Pixel Average

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view-dependent scalable coding of light fields using ROI-based techniques

View-dependent scalable coding of light fields using ROI-bas...

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Conference on Three-Dimensional TV, Video, and Display V

作者： Taguchi, Yuichi Takahashi, Keita Naemura, Takeshi Univ Tokyo Grad Sch Informat Sci & Technol Bunkyo Ku 7-3-1 Hongo Tokyo 1138656 Japan

ISBN: (纸本)9780819464903

This paper proposes a scalable coding scheme for interactive streaming of dynamic light fields, in which a region of interest (ROI) approach is applied for multi-view image sets. In our method, the image segments that are essential for synthesizing the view requested by a remote user are included in an ROI, which is compressed and transmitted with high priority. Since the data for the desired view are transmitted with the data for its neighboring views as the ROI, the user can render high quality novel views around the desired viewpoint before the arrival of the next frame data. Thus our method can compensate the movement of the remote user even if the network has high latency. Since the user can arbitrarily choose the movable range of the viewpoint by changing the size and weight ratio of the ROT, we call this functionality view-dependent scalability. Using a modified JPEG2000 codec, we evaluated the view-dependent scalability of our scheme by measuring the quality of synthesized views against the distance from the originally desired viewpoint.

关键词： multi-view coding light field streaming view-dependent scalability region of interest (ROI) image-based rendering rate-distortion optimization

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EDGE AND MOTION-ADAPTIVE MEDIAN FILTERING FOR multi-view DEPTH MAP ENHANCEMENT

EDGE AND MOTION-ADAPTIVE MEDIAN FILTERING FOR MULTI-VIEW DEP...

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Picture coding Symposium 2009

作者： Ekmekcioglu, Erhan Velisavljevic, Vladan Worrall, Stewart T. Univ Surrey Ctr Comm Syst Res Guildford GU2 5XH Surrey England Tech Univ Berlin Deutsche Telekom Labs Berlin Germany

ISBN: (纸本)9781424445936

We present a novel multi-view depth map enhancement method deployed as a post-processing of initially estimated depth maps, which are incoherent in the temporal and inter-view dimensions. The proposed method is based on edge and motion-adaptive median filtering and allows for an improved quality of virtual view synthesis. To enforce the spatial, temporal and inter-view coherence in the multi-view depth maps, the median filtering is applied to 4-dimensional windows that consist of the spatially neighbor depth map values taken at different viewpoints and time instants. These windows have locally adaptive shapes in a presence of edges or motion to preserve sharpness and realistic rendering. We show that our enhancement method leads to a reduction of a coding bit-rate required for representation of the depth maps and also to a gain in the quality of synthesized views at an arbitrary virtual viewpoint. At the same time, the method carries a low additional computational complexity.

关键词： Depth estimation Free viewpoint video multi-view coding multi-view depth map

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