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Post-processing of 3d video Extension of H.264/AVC for a Quality Enhancement of Synthesized View Sequences

ETRI JOURNAL 2014年第2期36卷 242-252页

作者： Bang, Gun Hur, Namho Lee, Seong-Whan ETRI Broadcasting & Telecommun Media Res Lab Taejon South Korea Korea Univ Dept Comp Sci & Engn Seoul South Korea Korea Univ Dept Brain & Cognit Engn Seoul South Korea

Since July of 2012, the 3d video extension of H.264/AVC has been under development to support the multi-view video plus depth format. In 3d video applications such as multi-view and free-view point applications, synthesized views are generated using coded texture video and coded depth video. Such synthesized views can be distorted by quantization noise and inaccuracy of 3d wrapping positions, thus it is important to improve their quality where possible. To achieve this, the relationship among the depth video, texture video, and synthesized view is investigated herein. Based on this investigation, an edge noise suppression filtering process to preserve the edges of the depth video and a method based on a total variation approach to maximum a posteriori probability estimates for reducing the quantization noise of the coded texture video. The experiment results show that the proposed methods improve the peak signal-to-noise ratio and visual quality of a synthesized view compared to a synthesized view without post processing methods.

关键词： 3d video coding view synthesis post-processing denoising MAP total variation

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Initialization, Limitation, and Predictive coding of the depth and Texture Quadtree in 3d-HEVC

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IEEE TRANSACTIONS ON CIRCUITS ANd SYSTEMS FOR video TECHNOLOGY 2014年第9期24卷 1554-1565页

作者： Mora, Elie Gabriel Jung, Joel Cagnazzo, Marco Pesquet-Popescu, Beatrice Orange Labs F-92794 Issy Les Moulineaux France Telecom ParisTech F-75634 Paris France

The 3d video extension of High Efficiency video coding (3d-HEVC) exploits texture-depth redundancies in 3d videos using intercomponent coding tools. It also inherits the same quadtree coding structure as HEVC for both components. The current software implementation of 3d-HEVC includes encoder shortcuts that speed up the quadtree construction process, but those are always accompanied by coding losses. Furthermore, since the texture and its associated depth represent the same scene, at the same time instant and view point, their quadtrees are closely linked. In this paper, an intercomponent tool is proposed in which this link is exploited to save both runtime and bits through a joint coding of the quadtrees. If depth is coded before the texture, the texture quadtree is initialized from the coded depth quadtree. Otherwise, the depth quadtree is limited to the coded texture quadtree. A 31% encoder runtime saving, a -0.3% gain for coded and synthesized views and a -1.8% gain for coded views are reported for the second method.

关键词： 3d video coding depth quadtree limitation intercomponent prediction predictive coding texture quadtree initialization

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Multiview and 3d video Compression Using Neighboring Block Based disparity Vectors

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IEEE TRANSACTIONS ON MULTIMEdIA 2016年第4期18卷 576-589页

作者： Chen, Ying Zhao, Xin Zhang, Li Kang, Je-Won Qualcomm Technol Inc San Diego CA 92121 USA Ewha Womans Univ Seoul 120750 South Korea

Compression of the statistical redundancy among different viewpoints, i.e., inter-view redundancy, is a fundamental and critical problem in multiview and three-dimensional (3d) video coding. To exploit the inter-view redundancy, disparity vectors are required to identify pixels of the same objects within two different views;in this way, the enhancement coding tools can be efficiently employed as new modes in block-based video codecs to achieve higher compression efficiency. Although disparity can be converted from depth, it is not possible in multiview video coding since depth information is not considered. Even when depth information is coded, it breaks the so-called multiview compatibility wherein texture views can be decoded without depth information. To resolve this problem, in this paper, a neighboring block-based disparity vector derivation (NBdV) method is proposed. The basic concept of NBdV is to derive a disparity vector (dV) of a current block by utilizing the motion information of spatially and temporally neighboring blocks predicted from another view. Through extensive experiments and analysis, it is shown that the proposed NBdV method achieves efficient dV derivation in the state-of-art video codecs, and it keeps the multiview compatibility with a relatively lower complexity. The proposed method has become an essential part of the 3d video standard extensions of H.264/AVC and HEVC.

关键词： 3d-AVC 3d-HEVC 3d video coding disparity vector (dV) multiview compatibility multiview video coding neighboring block based disparity vector derivation (NBdV)

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Fast encoder decision for texture coding in 3d-HEVC

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SIGNAL PROCESSING-IMAGE COMMUNICATION 2014年第9期29卷 951-961页

作者： Zhang, Na Zhao, debin Chen, Yi-Wen Lin, Jian-Liang Gao, Wen Harbin Inst Technol Dept Comp Sci & Technol Harbin 150001 Peoples R China MediaTek Hsinchu 30078 Taiwan

As a 3d extension of the High Efficiency video coding (HEVC) standard, 3d-HEVC is developed to improve the coding efficiency of multi-view video. However, the improvement of the coding efficiency is obtained at the expense of a computational complexity increase. How to relieve the computational burden of the encoder is becoming a critical problem in applications. In this paper, a fast encoder decision algorithm to encode the dependent texture views is proposed, where two strategies to accelerate encoder decision by exploiting inter-view correlations are utilized. The first one is an early merge mode decision algorithm, and the second one is an early CU splitting termination algorithm. Experimental results show that the proposed algorithm can achieve 47.1% encoding time saving with overall 0.1% Bd-rate reduction compared to HTM (3d-HEVC test model) version 7 under the common test condition (CTC). Both of the two strategies have been adopted into the 3d-HEVC reference software and enabled as a default encoding process under CTC. (C) 2014 Elsevier B.V. All rights reserved.

关键词： 3d video coding Early merge mode decision Early CU splitting termination Inter-view correlation 3d-HEVC

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System architecture for free-viewpoint video and 3d-TV

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IEEE TRANSACTIONS ON CONSUMER ELECTRONICS 2008年第2期54卷 925-932页

作者： Morvan, Yannick Farin, dirk de With, Peter H. N. Eindhoven Univ Technol NL-5600 MB Eindhoven Netherlands CycloMedia Technol Waardenburg Netherlands

This paper presents a system architecture of an acquisition, compression and rendering system for 3d-TV and free-viewpoint video applications. We show that the proposed system yields two distinct advantages. First, it achieves an efficient compression of 3d/multi-view video by extending a standard H.264 encoder such that near backward compatibility is retained. Second, the proposed system can efficiently compress both 3d-TV and free-viewpoint multi-view video datasets using the single proposed system architecture.

关键词： 3d-TV free viewpoint video multi-view video coding 3d video coding

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Fast encoder decision for dependent texture coding in 3d-AVS

Fast encoder decision for dependent texture coding in 3D-AVS

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30th IEEE Conference on Visual Communications and Image Processing (VCIP)

作者： Lu, Yiran Zhang, Na Fan, Xiaopeng Zhao, debin Harbin Inst Technol Dept Comp Sci & Technol Harbin 150001 Peoples R China

ISBN: (纸本)9781509053162

As a 3d extension of the Audio video coding Standard (AVS), 3d-AVS is used to improve the coding efficiency of multi-view video. However, the improved performance has also resulted in increased coding complexity. Taking into account the real-time request, how to reduce the complexity of the encoder is becoming very critical. In this paper, a fast encoder decision algorithm including two strategies is proposed. The first one is an early skip/direct mode decision algorithm, and the second one is an adaptive CU minimum splitting algorithm. Both of the two algorithms are applied to dependent texture views to reduce unnecessary visits by exploiting inter-view correlations between the dependent view and the base view. Experimental results show that the proposed algorithm can save 34.2% encoding time with 0.07% Bd-rate loss on the overall texture views compared to RFd-4.0 (3d-AVS test model) under the common test condition (CTC). Both of the two strategies have been adopted into the 3d-AVS reference software and disabled in the configuration file under CTC.

关键词： 3d video coding early skip/direct mode decision adaptive CU minimum splitting inter-view correlation 3d-AVS

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3d video COMMUNICATION SCHEME FOR ERROR PRONE ENVIRONMENTS BASEd ON MOTION VECTOR SHARING

3D VIDEO COMMUNICATION SCHEME FOR ERROR PRONE ENVIRONMENTS B...

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4th 3dTV Conference on the True Vision - Capture, Transmission and display of 3d video

作者： de Silva, d. V. S. X. Fernando, W. A. C. Worrall, S. T. Univ Surrey Multimedia Commun Res Lab I Guildford GU2 7XH Surrey England

ISBN: (纸本)9781424463794

The Emergence of three dimensional (3d) video applications, based on depth Image Based Rendering (dIBR) has brought about new dimensions to the video transmission problem, due to the need to transmit additional depth information to the receiver. Until the transmission problem of 3d video is adequately addressed, consumer applications based on 3d video will not gain much popularity. Exploiting the unique correlations that exist between the color and their corresponding depth images, will lead to more error resilient video encoding schemes for 3d video. In this paper we present an error resilient 3d video communication scheme that exploits the correlation of motion vectors in color and depth video streams. The presented method achieves up to 0.8 dB gain for color sequences and up to 0.7 dB gain for depth sequences over error prone communication channels.

关键词： 3d video coding Motion vector sharing Error resilient video coding depth Image Based Rendering

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VIEW SYNTHESIS QUALITY MAPPING FOR dEPTH-BASEd SUPER RESOLUTION ON MIXEd RESOLUTION 3d video

VIEW SYNTHESIS QUALITY MAPPING FOR DEPTH-BASED SUPER RESOLUT...

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3dTV-Conference on True Vision - Capture, Transmission and display of 3d video (3dTV-CON)

作者： Joachimiak, Michal Hannuksela, Miska M. Gabbouj, Moncef Tampere Univ Technol FIN-33101 Tampere Finland Nokia Res Ctr Tampere Finland

ISBN: (纸本)9781479947584

Advances in 3d video technology expand the availability of hardware for 3d video generation and display. Some 3d capture and coding arrangements take advantage of a mixed resolution setup. In difference to typical 3d multiview video the mixed resolution scenario assumes that a subset of views is coded at reduced spatial resolution. After decoding, the low resolution views have to upsampled in order to preserve homogeneous resolution of the rendered 3d video. We improve the depth-based super resolution technique that uses a view synthesis process as an essential step. We propose to improve the view synthesis step by per-pixel selection of the projection method. The method is tested on the data coded using a mixed resolution 3d video codec implemented on top of the 3dV-ATM reference software and evaluated under the JCT-3V common test conditions. Simulation results show that our method can improve the depth-based super resolution upsampling by 0.64% of dBR on average for total coded bitrate and 0.55% of dBR on average for synthesized views. Aggregated coding gain with respect to full resolution scenario is improved by 7.71% of dBR on average for total coded bitrate and 11.1% dBR for synthesized views.

关键词： 3d video coding upsampling super resolution view synthesis view projection image warping mixed resolution depth-based super resolution

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Single depth intra coding mode in 3d-HEVC

Single depth intra coding mode in 3D-HEVC

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Chen, Yi-Wen Lin, Jian-Liang Huang, Yu-Wen Lei, Shawmin MediaTek Inc 1Dusing Rd 1Hsinchu Sci Pk Hsinchu Taiwan

ISBN: (纸本)9781479983919

As the state-of-the-art video coding standard, High Efficiency video coding (HEVC) has been finalized in January 2013. To support the coding of multiple views and associated depth data, the development of the HEVC extension for 3d video coding is also about to be finalized. New coding unit (CU) level coding tools are added to the HEVC design to improve the compression capabilities for both video views and depth data. In this paper, we introduce a new coding mode termed as "Single depth Intra coding Mode" to efficiently code the smooth area within a depth map. The concept of single depth mode is to simply reconstruct a coding block with a single depth value based on block merging scheme under the HEVC quad-tree based block partitioning. The proposed single depth mode has been adopted into the working draft and 3d-HEVC test model 12 (HTM-12.0). The experimental results evaluated under the common test conditions (CTC) for 3d-HEVC show that the proposed technique achieves up to 5% bit-rate saving for depth coding and on average 0.3% bit-rate saving regarding the synthesis results over the texture and depth bit-rate with decoding time reduced by 4%.

关键词： HEVC 3d video coding single depth intra mode intra prediction 3d-HEVC

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3d video QUALITY METRIC FOR 3d video COMPRESSION

3D VIDEO QUALITY METRIC FOR 3D VIDEO COMPRESSION

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IEEE 11th IVMSP Workshop - 3d Image/video Technologies and Applications

作者： Banitalebi-dehkordi, Amin Pourazad, Mahsa T. Nasiopoulos, Panos Univ British Columbia Dept Elect & Comp Engn Vancouver BC V5Z 1M9 Canada

ISBN: (纸本)9781467358583

As the evolution of multiview display technology is bringing glasses-free 3dTV closer to reality, MPEG and VCEG are preparing an extension to HEVC to encode multiview video content. View synthesis in the current version of the 3d video codec is performed using PSNR as a quality metric measure. In this paper, we propose a full-reference Human-Visual-System based 3d video quality metric to be used in multiview encoding as an alternative to PSNR. Performance of our metric is tested in a 2-view case scenario. The quality of the compressed stereo pair, formed from a decoded view and a synthesized view, is evaluated at the encoder side. The performance is verified through a series of subjective tests and compared with that of PSNR, SSIM, MS-SSIM, VIFp, and VQM metrics. Experimental results showed that our 3d quality metric has the highest correlation with Mean Opinion Scores (MOS) compared to the other tested metrics.

关键词： 3d video coding human visual system stereoscopic video quality metric disparity map

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