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

作者： Su, Jing Luo, Falei Wang, Shanshe Wang, Shiqi Guo, Xiaoqiang Ma, Siwei Peking Univ Shenzhen Grad Sch Shenzhen Peoples R China Peking Univ Inst Digital Media Beijing Peoples R China Peking Univ Cooperat Medianet Innovat Ctr Beijing Peoples R China Acad Broadcasting & Sci Beijing Peoples R China

ISBN: (纸本)9781509053162

In this paper, a new mode decision scheme is proposed for depth map coding in 3D-AVS. The novelty of the paper mainly contains the following two points. Firstly, an improved distortion estimation model of synthesized views is proposed. Secondly, for the mode decision of depth map coding, the distortion is represented to be the weighted sum of depth distortion and estimated distortion of the synthesized view. We proposed a new scheme to derive the weighting factors adaptively based on the disparity. Then the distortion is utilized to calculate the rate distortion cost for mode decision. Experimental results demonstrate that the proposed scheme achieves remarkable performance improvement in 3D-AVS. The average BD-rate gain is about 12%.

关键词： Terms depth distortion view synthesized distortion estimation depth map coding disparity 3D-AVS

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Fusion of colour and depth partitions for depth map coding

Fusion of colour and depth partitions for depth map coding

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18th International Conference on Digital Signal Processing (DSP)

作者： Maceira, M. Morros, J. R. Ruiz-Hidalgo, J. Univ Politecn Cataluna Dept Signal Theory & Commun Barcelona Spain

ISBN: (纸本)9781467358057

3D video coding includes the use of multiple color views and depth maps associated to each view. An adequate coding of depth maps should be adapted to the characteristics of depth maps: smooth regions and sharp edges. In this paper a segmentation-based technique is proposed for improving the depth map compression while preserving the main discontinuities that exploits the color-depth similarity of 3D video. An initial coarse depth map segmentation is used to locate the main discontinuities in depth. The resulting partition is improved by fusing a color partition. We assume that the color image is first encoded and available when the associated depth map is encoded, therefore the color partition can be segmented in the decoder without introducing any extra cost. A new segmentation criterion inspired by super-pixels techniques is proposed to obtain the color partition. Initial experimental results show similar compression efficiency to hevc with a big potential for further improvements.

关键词： depth map coding 3DTV Shape-adaptive DCT depth/texture compression

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Adaptive Fast Intra Mode Decision of depth map coding by Low Complexity RD-Cost in 3D-HEVC

Adaptive Fast Intra Mode Decision of Depth Map Coding by Low...

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IEEE International Conference on Digital Signal Processing (DSP)

作者： Zhang, Hong-Bin Fu, Chang-Hong Su, Wei-Min Tsang, Sik-Ho Chan, Yui-Lam Nanjing Univ Sci & Technol Sch Elect & Opt Engn Nanjing Jiangsu Peoples R China Hong Kong Polytech Univ Dept Elect & Informat Engn Hong Kong Hong Kong Peoples R China

ISBN: (纸本)9781479980581

The coding efficiency of 3D-HEVC can be improved significantly by adopting more intra modes in depth map coding, including up to 35 conventional HEVC intra prediction modes and 4 depth modelling modes (DMMs). However, traversing these modes dramatically results in unendurable high complexity. In this paper, we propose an efficient intra mode decision algorithm by taking advantage of the Low Complexity Rate-Distortion Cost information in the rough mode decision. Only one conventional intra mode and several most probable modes are then selected for most cases adaptively based on the threshold derived from the prior probability. Experimental results show that the proposed algorithm provides about 34% saving in terms of the total depth coding time with little drop of the coding performance compared with the state-of-the-art algorithm.

关键词： multi-view videos plus depth 3D-HEVC intra prediction rough mode decision depth map coding

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Fast Single depth Intra Mode Decision for depth map coding in 3D-HEVC

Fast Single Depth Intra Mode Decision for Depth Map Coding i...

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IEEE International Conference on Multimedia & Expo Workshops (ICMEW)

作者： Kim, Miok Ling, Nam Song, Li Santa Clara Univ Dept Comp Engn Santa Clara CA 95053 USA Shanghai Jiao Tong Univ Dept Elect Engn Shanghai Peoples R China

ISBN: (纸本)9781479970797

In 3D-HEVC, single depth intra mode has been applied and has been integrated into depth intra skip mode for efficient depth map coding. With single depth intra mode, one 2Nx2N prediction unit (PU) is predicted without high computational prediction process. In this paper, we propose a fast single depth intra mode decision method to address the problem of high computational complexity burden in depth intra mode decision of 3D-HEVC. To remove unnecessary computational complexity at the encoder, we early decide single depth intra mode for pruning quadtree in 3D-HEVC. This paper characterizes the statistics of smooth depth map signals for depth intra modes and analyzes distortion metrics of view synthesis optimization functionality as a decision criterion. With this proposed criterion, a single depth intra mode for intra coding has been detected and hierarchical CU/PU selection for intra coding can be stopped in 3D-HEVC. As a consequence, it utilizes the correlation between hierarchical block-based video coding and coding unit (CU)/PU mode decision for depth map coding so that a large number of recursive rate-distortion cost calculations can be skipped. We demonstrate the effectiveness of our approach experimentally. The simulation results show that the proposed scheme can achieve approximately 25.6% encoding time saving with 0.07% video PSNRltotal bitrate gain and 0.18% synthesized view PSNRltotal bitrate loss under all intra configuration.

关键词： Video coding visual communications 3D video codec depth map coding fast mode decision statistical analysis intra prediction

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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...

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20th IEEE International Conference on Image Processing (ICIP)

作者： Gao, Min Fan, Xiaopeng Zhao, Debin Jiang, Feng Gao, Wen Harbin Inst Technol Dept Comp Sci & Technol Harbin 150006 Peoples R China

ISBN: (纸本)9781479923410

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

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BLOCK-ADAPTIVE PALETTE-BASED PREDICTION FOR depth map coding

BLOCK-ADAPTIVE PALETTE-BASED PREDICTION FOR DEPTH MAP CODING

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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

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Region-based depth map coding using a 3D scene representation 40

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

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40th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2015

作者： Maceira, M. Morros, J.R. Ruiz-Hidalgo, J. Barcelona Spain

ISBN: (纸本)9781467369978

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. © 2015 IEEE.

关键词： 3D video 3dtv depth map coding

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depth map coding using Residual Segmentation for 3D Video System

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3D RESEARCH 2013年第2期4卷 5-5页

作者： Lee, Cheon Ho, Yo-Sung GIST 123 Cheomdan Gwagiro Gwangju 500712 South Korea

Advanced 3D video systems employ multi-view video-plus-depth data to support the free-viewpoint navigation and comfortable 3D viewing;thus efficient depth map coding becomes an important issue. Unlike the color image, the depth map has a property that depth values of the inner part of an object are monotonic, but those of object boundaries change abruptly. Therefore, residual data generated by prediction errors around object boundaries consume many bits in depth map coding. Representing them with segment data can be better than the use of the conventional transformation around the boundary regions. In this paper, we propose an efficient depth map coding method using a residual segmentation instead of using transformation. The proposed residual segmentation divides residual data into two regions with a segment map and two mean values. If the encoder selects the proposed method in terms of rates, two quantized mean values and an index of the segment map are transmitted. Simulation results show significant gains of up to 10 dB compared to the state-ofthe-art coders, such as JPEG2000 and H.264/AVC.

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

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Texture video-assisted motion vector predictor for depth map coding

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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

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DMMFast: a complexity reduction scheme for three-dimensional high-efficiency video coding intraframe depth map coding

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JOURNAL OF ELECTRONIC IMAGING 2015年第2期24卷 023011-023011页

作者： Sanchez, Gustavo Saldanha, Mario Balota, Gabriel Zatt, Bruno Porto, Marcelo Agostini, Luciano Univ Fed Pelotas Grp Architecture & Integrated Circuits BR-96160000 Pelotas Brazil

We present a complexity reduction scheme for the depth map intraprediction of three-dimensional high-efficiency video coding (3-D-HEVC). The 3-D-HEVC introduces a new set of specific tools for depth map coding, inserting additional complexity to intraprediction, which results in new challenges in terms of complexity reduction. Therefore, we present the DMMFast (depth modeling modes fast prediction), a scheme composed of two new algorithms: the simplified edge detector (SED) and the gradient-based mode one filter (GMOF). The SED anticipates the blocks that are likely to be better predicted by the traditional intramodes, avoiding the evaluation of DMMs. The GMOF applies a gradient-based filter in the borders of the block and predicts the best positions to evaluate the DMM 1. Software evaluations showed that DMMFast is capable of achieving a time saving of 11.9% on depth map intraprediction, considering the random access mode, without affecting the quality of the synthesized views. Considering the all intraconfigurations, the proposed scheme is capable of achieving, on average, a time saving of 35% considering the whole encoder. Subjective quality assessment was also performed, showing that the proposed technique inserts minimal quality losses in the final encoded video. (C) 2015 SPIE and IS&T

关键词： three-dimensional high-efficiency video coding depth map coding depth modeling modes intrapredictions complexity reduction three-dimensional video coding

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