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检索条件"主题词=depth map coding"

共 80 条记录，以下是61-70 订阅

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ARITHMETIC EDGE coding FOR ARBITRARILY SHAPED SUB-BLOCK MOTION PREDICTION IN depth VIDEO COMPRESSION

ARITHMETIC EDGE CODING FOR ARBITRARILY SHAPED SUB-BLOCK MOTI...

引用

19th IEEE International Conference on Image Processing (ICIP)

作者： Daribo, Ismael Cheung, Gene Florencio, Dinei National Institute of Informatics Japan Microsoft Research United States

ISBN: (纸本)9781467325332;9781467325349

depth map compression is important for compact representation of 3D visual data in "texture-plus-depth" format, where texture and depth maps of multiple closely spaced viewpoints are encoded and transmitted. A decoder can then freely synthesize any chosen intermediate view via depth-image-based rendering (DIBR) using neighboring coded texture and depth maps as anchors. In this work, we leverage on the observation that "pixels of similar depth have similar motion" to efficiently encode depth video. Specifically, we divide a depth block containing two zones of distinct values (e. g., foreground and background) into two sub-blocks along the dividing edge before performing separate motion prediction. While doing such arbitrarily shaped sub-block motion prediction can lead to very small prediction residuals (resulting in few bits required to code them), it incurs an overhead to losslessly encode dividing edges for sub-block identification. To minimize this overhead, we first devise an edge prediction scheme based on linear regression to predict the next edge direction in a contiguous contour. From the predicted edge direction, we assign probabilities to each possible edge direction using the von Mises distribution, which are subsequently inputted to a conditional arithmetic codec for entropy coding. Experimental results show an average overall bitrate reduction of up to 30% over classical H.264 implementation.

关键词： depth-image-based rendering depth map coding arithmetic coding edge coding

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Improved Reconstruction of Downsampled MV-HEVC depth Video 17

Improved Reconstruction of Downsampled MV-HEVC Depth Video

引用

IEEE EUROCON -17th International Conference on Smart Technologies

作者： Zammit, Luke Debono, Carl James Univ Malta Dept Commun & Comp Engn Msida Malta

ISBN: (纸本)9781509038435

The multiview video-plus-depth format provides a promising solution for the transmission of three-dimensional video. This format can be transmitted using the multiview high efficiency video coding (MV-HEVC) standard, where the texture and the depth videos are encoded and transmitted separately. The depth maps have large homogeneous areas making their downsampling before transmission and their upsampling at the receiver an attractive option to reduce bandwidth requirements. However, this process results in distortions of the sharp edges also characteristic of depth maps, causing artefacts in the synthesized views. This work exploits the edges found in the corresponding texture view and uses a novel edge detection and depth map painting algorithm to improve the reconstruction of the edges in the upsampled depth maps. Test results show that this solution can improve the quality of depth maps by up to 2.35dB compared to other methods found in literature.

关键词： 3D video coding depth map coding edge reconstruction multiview video MV-HEVC

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A NEW MODE SELECTION TECHNIQUE FOR coding depth mapS OF 3D VIDEO

A NEW MODE SELECTION TECHNIQUE FOR CODING DEPTH MAPS OF 3D V...

引用

2010 IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： De Silva, D. V. S. X. Fernando, W. A. C. Arachchi, H. Kodikara Univ Surrey CCSR I Lab Guildford GU2 7XH Surrey England

ISBN: (纸本)9781424442966

Compression of depth maps that are used in 3D video systems based on depth Image Based Rendering (DIBR) poses a new challenge in video coding, since it is not a sequence of images for final viewing by end users rather an aid for rendering. Therefore, compressing depth maps using existing video coding techniques yields unacceptable distortions while rendering virtual views. In this paper we propose a novel mode selection method for offline compression of depth maps by selecting modes collaboratively considering an entire row of macroblocks together. For selecting these modes while encoding, we propose a novel distortion criteria that incorporates rendering distortions instead of distortion of depth map itself. A genetic algorithm based optimization technique is used for the mode selection. The simulation results suggest that the proposed technique can improve the PSNR up to 1.6dB in the rendered stereoscopic views in comparison to the block wise mode selection method based on Lagrange Optimization and the distortion of the depth map itself.

关键词： depth map coding 3D video DIBR

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Object Boundary-Based Synthesized View Distortion Estimation 10

Object Boundary-Based Synthesized View Distortion Estimation

引用

10th IEEE Conference on Industrial Electronics and Applications

作者： Kim, Miok Ling, Nam Santa Clara Univ Dept Comp Engn Santa Clara CA 95053 USA

ISBN: (纸本)9781479983896

In this paper, we propose an object boundary based view synthesis distortion estimation (VSDE) for depth map coding to improve virtual synthesized view quality. The proposed method estimates depth map distortion related to an energy minimization in such a way that additional sharp edge information of depth maps involves in VSDE. It aims at reducing visual artifacts of synthesized views along sharp edge areas while maintaining coding efficiency of depth map coding. As a result, it improves the depth coding performance slightly and reduces rendering distortions around the object boundaries. Experimental results show that the proposed method shows improved subjective visual quality while reducing coding redundancy.

关键词： Video coding visual communications 3D video codec depth map coding multi-view video plus depth (MVD) format visual quality

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ON MODELING THE RENDERING ERROR IN 3D VIDEO

ON MODELING THE RENDERING ERROR IN 3D VIDEO

引用

19th IEEE International Conference on Image Processing (ICIP)

作者： Cheung, Ngai-Man Tian, Dong Vetro, Anthony Sun, Huifang Mitsubishi Elect Res Labs Tokyo Japan

ISBN: (纸本)9781467325332;9781467325349

We propose an analytical model to estimate the rendering quality in 3D video. The model relates errors in the depth images to the rendering quality, taking into account texture image characteristics, texture image quality, the camera configuration and the rendering process. Specifically, we derive position (disparity) errors from the depth errors, and the probability distribution of the position errors is used to calculate the power spectral density of the rendering errors. Experiment results with video sequences and coding/rendering tools used in MPEG 3DV activities show that the model can accurately estimate the synthesis noise up to a constant offset. Thus, the model can be used to estimate the change in rendering quality for different system designs.

关键词： 3D video DIBR depth map coding rendering power spectral density

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An Efficient Distortion Model Configuration for depth coding in 3D-HEVC

An Efficient Distortion Model Configuration for Depth Coding...

引用

IEEE Asia Pacific Conference on Circuits and Systems (APCCAS)

作者： Li, Chenyang Jin, Xin Dai, Qionghai Tsinghua Univ Grad Sch Shenzhen Shenzhen Key Lab Broadband Network & Multimedia Shenzhen 518055 Peoples R China

ISBN: (纸本)9781479952304

3D-HEVC is the latest 3D video project of MPEG for 3D video coding. To compress the depth videos in 3D-HEVC efficiently, depth distortion models considering the distortions in synthesized views have been introduced. However, these models introduce a big burden in coding complexity. In this paper, a configuration of depth distortion models applied at each encoding decision stage of 3D-HEVC is proposed based on a comprehensive analysis of typical depth distortion models and different configurations of representative models. It provides better trade-off between compression efficiency and coding complexity for depth map coding. An average of 12.6% reduction in time complexity is achieved without compression efficiency loss.

关键词： depth map coding rate-distortion optimization view synthesis 3D-HEVC

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Fast Motion Estimation A lgorithm for depth map

Fast Motion Estimation A lgorithm for Depth Map

引用

IEEE International Conference on Consumer Electronics (ICCE)

作者： Oh, Byung Tae Oh, Kwan-Jung Korea Aerosp Univ Goyang South Korea Elect & Telecommun Res Inst Taejon South Korea

ISBN: (纸本)9781479912919

The paper presents a fast motion estimation scheme for depth map coding. The distortion measuring process has many redundant operations due to the piece-wise planner property of the depth map. The proposed scheme is designed to reduce those redundant operations by grouping each block into one or two representative values. Then, the entire pixel computations in a block are replaced with a few operations between representative values. As a result, the total number of operations is greatly reduced by 92%, while its impact on the performance is negligible regardless of the searching methods.

关键词： motion estimation video coding 3D video system depth map coding distortion measuring process fast motion estimation algorithm fast motion estimation scheme piece-wise planner property pixel computations searching methods Algorithm design and analysis Complexity theory Distortion measurement Encoding Image coding Motion estimation Video coding

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OPTIMIZATION OF OCCLUSION-INDUCING depth PIXELS IN 3-D VIDEO coding 25

OPTIMIZATION OF OCCLUSION-INDUCING DEPTH PIXELS IN 3-D VIDEO...

引用

25th IEEE International Conference on Image Processing (ICIP)

作者： Gao, Pan Ozcinar, Cagri Smolic, Aljosa Nanjing Univ Aeronaut & Astronaut Coll Comp Sci & Technol Nanjing Jiangsu Peoples R China Trinity Coll Dublin Sch Comp Sci & Stat V SENSE Project Dublin Ireland

ISBN: (纸本)9781479970612

The optimization of occlusion-inducing depth pixels in depth map coding has received little attention in the literature, since their associated texture pixels are occluded in the synthesized view and their effect on the synthesized view is considered negligible. However, the occlusion-inducing depth pixels still need to consume the bits to be transmitted, and will induce geometry distortion that inherently exists in the synthesized view. In this paper, we propose an efficient depth map coding scheme specifically for the occlusion-inducing depth pixels by using allowable depth distortions. Firstly, we formulate a problem of minimizing the overall geometry distortion in the occlusion subject to the bit rate constraint, for which the depth distortion is properly adjusted within the set of allowable depth distortions that introduce the same disparity error as the initial depth distortion. Then, we propose a dynamic programming solution to find the optimal depth distortion vector for the occlusion. The proposed algorithm can improve the coding efficiency without alteration of the occlusion order. Simulation results confirm the performance improvement compared to other existing algorithms.

关键词： Occlusion depth map coding allowable depth errors optimization

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WYNER-ZIV coding FOR depth mapS IN MULTIVIEW VIDEO-PLUS-depth

WYNER-ZIV CODING FOR DEPTH MAPS IN MULTIVIEW VIDEO-PLUS-DEPT...

引用

18th IEEE International Conference on Image Processing (ICIP)

作者： Petrazzuoli, Giovanni Cagnazzo, Marco Dufaux, Frederic Pesquet-Popescu, Beatrice TELECOM ParisTech TSI Dept F-75634 Paris 13 France

ISBN: (纸本)9781457713033

Three dimensional digital video services are gathering a lot of attention in recent years, thanks to the introduction of new and efficient acquisition and rendering devices. In particular, 3D video is often represented by a single view and a so called depth map, which gives information about the distance between the point of view and the objects. This representation can be extended to multiple views, each with its own depth map. Efficient compression of this kind of data is of course a very important topic in sight of a massive deployment of services such as 3D-TV and FTV (free viewpoint TV). In this paper we consider the application of distributed coding techniques to the coding of depth maps, in order to reduce the complexity of single view or multi view encoders and to enhance interactive multiview video streaming. We start from state-of-the-art distributed video coding techniques and we improve them by using high order motion interpolation and by exploiting texture motion information to encode the depth maps. The experiments reported here show that the proposed method achieves a rate reduction up to 11.06% compared to state-of-the-art distributed video coding technique.

关键词： Distributed video coding image interpolation multiview video-plus-depth depth map coding

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Geometry-based Block Partitioning for Efficient Intra Prediction in depth Video coding

Geometry-based Block Partitioning for Efficient Intra Predic...

引用

Conference on Visual Information Processing and Communication

作者： Kang, Min-Koo Lee, Jaejoon Lee, Jin Young Ho, Yo-Sung GIST 261 Cheomdan Gwagiro Kwangju 500712 South Korea Samsung Elect Co Ltd Multimedia Lab Gyeonggi 446712 South Korea

ISBN: (纸本)9780819479365

In the 3D video system including depth information, once a depth video is coded by the state-of-the-art video compression tools such as H.264/AVC, depth errors around the boundaries of objects can be intensified, and these can significantly affect the quality of rendered virtual view later. Despite this drawback of depth video coding, its compression is essential because of the enormous amount of input data in the 3D video system. In this paper, we propose a line-based partitioned intra prediction method which exploits geometric redundancy of depth video for an efficient compression without significant errors around boundaries. The proposed algorithm can efficiently divide the current coded block into two partitioned regions, and the algorithm independently predicts each region with previously coded neighboring pixels. Finally, the generated prediction mode adaptively alternates the conventional DC intra prediction mode. To evaluate the intra prediction performances, we have implemented the proposed method into H.264/AVC intra prediction scheme. Experimental results have demonstrated that our proposed method provides higher coding performance. The coding performance for depth video compression itself was up to 4.43% bit-saving or 0.526 dB gain in terms of peak signal-to-noise ratio (PSNR) among proper depth sequences which contain line-like boundaries.

关键词： 3D video depth map coding MVC H.264/AVC intra prediction block partitioning

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