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检索条件"主题词=3D video coding"

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Adaptive block size selection for inter-layer backward view synthesis prediction 3

Adaptive block size selection for inter-layer backward view ...

引用

Conference on Optoelectronic Imaging and Multimedia Technology III

作者： Chen, Li Hannuksela, Miska M. Li, Houqiang Univ Sci & Technol China Hefei 230027 Anhui Peoples R China Nokia Res Ctr Tampere 33720 Finland

ISBN: (纸本)9781628413465

Traditional forward view synthesis prediction enables the efficient use of depth to provide synthesized frames for texture reference in non-base layers. But asserted drawbacks of high complexity that results from edge detection, hole-filling, up sampling and down sampling in forward warping technique compromise the positive performance. Hence, backward view synthesis prediction is proposed to remove these drawbacks while maintaining the performance. However, fixed depth block used in backward view synthesis prediction limits the performance gain and the number of motion compensation operations, which is a requisite concern of complexity analysis. In this paper, a block based BVSP for inter-layer prediction with only high-level syntax changes is implemented and an adaptive depth block size selection method is proposed. The experimental results show that an average gain of 3.5% bitrate reduction was achieved and after enabling adaptive depth block size selection, this performance gain is relatively maintained while the number of motion compensation operations was reduced to a designated level.

关键词： View synthesis prediction 3d video coding depth map MV-HEVC

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BACKWARd VIEW SYNTHESIS PREdICTION USING VIRTUAL dEPTH MAP FOR MULTIVIEW video PLUS dEPTH MAP coding

BACKWARD VIEW SYNTHESIS PREDICTION USING VIRTUAL DEPTH MAP F...

引用

IEEE International Conference on Visual Communications and Image Processing (VCIP)

作者： Shimizu, Shinya Sugimoto, Shiori Kimata, Hideaki Kojima, Akira NTT Corp NTT Media Intelligence Labs Tokyo Japan

ISBN: (纸本)9781479902880

View synthesis prediction has been studied as an efficient inter-view prediction scheme. Existing view synthesis prediction schemes fall into two types according to the pixel warping direction. While backward warping based view synthesis prediction enables block-based processing, forward warping based view synthesis prediction can handle occlusions properly. This paper proposes a two-step warping based view synthesis prediction;a virtual depth map is first generated by forward warping, and then prediction signals are generated by block-based backward warping using the virtual depth map. The technique of backward-warping-aware depth inpainting is also proposed. Experiments show that the proposed VSP scheme can achieve the decoder runtime reductions of about 37% on average with slight bitrate reductions relative to the conventional forward warping based VSP. Compared to the conventional backward warping based VSP, the proposed method reduces the bitrate for the synthesized views by up to 2.9% and about 2.2% on average.

关键词： 3d video coding Multiview video plus depth map View synthesis prediction

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video and depth Bitrate Allocation in Multiview Compression

Video and Depth Bitrate Allocation in Multiview Compression

引用

21st International Conference on Systems, Signals and Image Processing (IWSSIP)

作者： Klimaszewski, Krzysztof Wegner, Krzysztof domanski, Marek Poznan Univ Tech Chair Multimedia Telecommun & Microelect Polanka 3 PL-61131 Poznan Poland

ISBN: (纸本)9789531841917

In the paper, a novel method for determining the optimal ratio between bitrate of texture (video) and depth data in a multiview compression with depth maps is presented. The method provides an easy way of adjusting the bitrate of compressed data stream using only a single parameter, while maintaining the correct balance between video and depth bitrate. The balance is optimized for the best possible quality of the synthesized view that can be generated in the range between input views. The works concentrate on a scenario where the video and depth maps are compressed independently using the contemporary multiview coder.

关键词： 3d video coding depth coding multiview compression multiview with depth MVC

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SIMPLIFIEd INTER-COMPONENT dEPTH MOdELING IN 3d-HEVC 11th

SIMPLIFIED INTER-COMPONENT DEPTH MODELING IN 3D-HEVC

引用

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

作者： Song, Yunseok Ho, Yo-Sung GIST Kwangju South Korea

ISBN: (纸本)9781467358576

In this paper, we present a method to reduce complexity of depth modeling modes (dMM), which is currently used in the 3d-HEVC standardization activity. dMM adds four modes to the existing HEVC intra prediction modes;the main purpose is to accurately represent object edges in depth video. Mode 3 of dMM requires distortion calculation of all pre-defined wedgelets. The proposed method employs absolute differences of neighboring pixels in the reference block. The number of wedgelets that need to be concerned can be reduced to six. Experimental results show 3.1% complexity reduction on average while maintaining coding performance, which implies that the correct wedgelet is included, while non-viable wedgelets are disregarded.

关键词： 3d video coding depth coding depth modeling

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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 planar model based intra prediction method for depth map coding

A planar model based intra prediction method for depth map c...

引用

International Conference on Information Technology and Industrial Engineering

作者： Hu, Ruifang Yuan, Hui Ge, Chuan Li, Yujun Liu, Wei Shandong Univ Sch Informat Sci & Engn Jinan 250100 Peoples R China Digital Multi Media Technol Hisense State Key Lab Qingdao Peoples R China

ISBN: (纸本)9781845648442;9781845648435

A planar model based intra prediction method for depth map is proposed based on the analyses of the nature of depth maps. The neighboring pixels as well as their corresponding pixel coordinates of current block are utilized to compute model parameters. Then, the predicted pixels of the current block are calculated based on the proposed model. Finally, a rate distortion criterion is used to choose the optimal prediction method between the proposed one and those of H.264. Experimental results demonstrate that by implementing the proposed method into H.264/multi-view video coding (MVC) software platform Joint Model of Multiview video coding version 8.3 (JMVC8.3), the maximum and average bit rate savings of depth maps can be achieved as high as -13.14% and -6.35%, respectively, while maintaining the same quality of synthesized virtual views.

关键词： intra prediction planar model depth maps coding 3d video coding

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IMPROVEd dISPARITY VECTOR dERIVATION IN 3d-HEVC

IMPROVED DISPARITY VECTOR DERIVATION IN 3D-HEVC

引用

IEEE International Conference on Visual Communications and Image Processing (VCIP)

作者： Zhang, Na Chen, Yi-Wen Lin, Jian-Liang Fan, Xiaopeng Ma, Siwei Zhao, debin Gao, Wen Harbin Inst Technol Dept Comp Sci & Technol Harbin 150006 Peoples R China Mediatek Inc Hsinchu Taiwan Peking Univ Beijing Peoples R China

ISBN: (纸本)9781479902880

In the High Efficiency video coding (HEVC) based 3d video coding, 3d-HEVC, the disparity vector (dV) derivation is critical for inter-view motion prediction, interview residual prediction, disparity-compensated prediction (dCP) or any other tools exploiting inter-view correlation. In HTM-5.0.1, the dV is derived from some spatial and temporal neighbors to locate a corresponding block in another view. This paper advocates modifications of the dV derivation to reduce the complexity and to achieve slightly better coding efficiency. Firstly, we propose to remove the additional temporal block, unify the dV searching order for all views, and to impose restrictions on the temporal blocks for memory access bandwidth and complexity reduction in dV derivation. We also propose an improved dV searching order for slightly better coding performance. These proposed methods were adopted into the 3d-HEVC standard in the 3rd JCT-3V meeting in Jan. 2013.

关键词： 3d video coding dV derivation interview prediction 3d-HEVC

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HIGH PRIORITY INTRA coding METHOd FOR dEPTH video coding

HIGH PRIORITY INTRA CODING METHOD FOR DEPTH VIDEO CODING

引用

29th Picture coding Symposium (PCS)

作者： Oh, Kwan-Jung Lee, Jaejoon Park, du-Sik Samsung Elect Samsung Adv Inst Technol Adv Media Lab Seoul South Korea

ISBN: (纸本)9781457720482

depth video coding is one of the key techniques to realize the three-dimensional (3d) video system. The depth video is spatially high correlated compared to its corresponding color video in general. In this paper, we propose a high priority intra coding method for depth video coding to efficiently reduce the spatial redundancy. The proposed intra mode is designed based on the intra 16x16 mode. It exploits the derived prediction direction from the adjacent neighboring pixels and does not encode any residual data. The proposed intra mode is allowed I slice as well as P and B slices. It is newly defined for I slice as skip mode and replaced with the skip or direct modes for P and B slices. By the experiments on JMVC 8.2, we confirm that the proposed high priority intra mode reduces about 14.63% bit rate compared to JMVC 8.2 at the same rendering quality.

关键词： depth coding 3d video coding

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GENERIC SEGMENT-WISE dC FOR 3d-HEVC dEPTH INTRA coding

GENERIC SEGMENT-WISE DC FOR 3D-HEVC DEPTH INTRA CODING

引用

IEEE International Conference on Image Processing

作者： Hongbin Liu Ying Chen Qualcomm Technology Inc.

ISBN: (纸本)9781479957521

In 3d extension of HEVC (High Efficiency video coding), namely, 3d-HEVC, segment-wise dC coding (SdC) was adopted to more efficiently represent the depth residual for Intra coded depth blocks. Instead of coding pixel-wise residual as in HEVC, SdC codes one dC residual value for each segment of a Prediction Unit (PU) and skips transform and quantization. SdC was originally proposed for only a couple of modes, including the dC mode, Planar mode and depth modeling mode (dMM), which has an arbitrary straight line separation of a PU. This paper proposes a generic SdC method that applies to the conventional angular Intra modes. For each depth prediction unit coded with Intra prediction mode, encoder can adaptively choose to code pixel-wise residual or segment-wise residual to achieve better compression efficiency. Experimental results show that proposed method can reduce the total bit rate by about 1% even though the depth views altogether consumes relatively low percentage of the total bit rate.

关键词： Segment-wise dC coding depth Intra prediction mode 3d-HEVC 3d video coding SdC

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Predictive coding of depth images across multiple views

Predictive coding of depth images across multiple views

引用

Conference on Stereoscopic displays and Virtual Reality Systems XIV

作者： Morvan, Yannick Farin, dirk de With, Peter H. N. Eindhoven Univ Technol POB 513 NL-5600 MB Eindhoven Netherlands LogicaCMG NL-5605 JB Eindhoven Netherlands

ISBN: (纸本)9780819466037

A 3d video stream is typically obtained from a set of synchronized cameras, which are simultaneously capturing the same scene (multiview video). This technology enables applications such as free-viewpoint video which allows the viewer to select his preferred viewpoint, or 3d TV where the depth of the scene can be perceived using a special display. Because the user-selected view does not always correspond to a camera position, it may be necessary to synthesize a virtual camera view. To synthesize such a virtual view, we have adopted a depthimage-based rendering technique that employs one depth map for each camera. Consequently, a remote rendering of the 3d video requires a compression technique for texture and depth data. This paper presents a predictive-coding algorithm for the compression of depth images across multiple views. The presented algorithm provides (a) an improved coding efficiency for depth images over block-based motion-compensation encoders (H.264), and (b), a random access to different views for fast rendering. The proposed depth-prediction technique works by synthesizing/computing the depth of 3d points based on the reference depth image. The attractiveness of the depth-prediction algorithm is that the prediction of depth data avoids an independent transmission of depth for each view, while simplifying the view interpolation by synthesizing depth images for arbitrary view points. We present experimental results for several multiview depth sequences, that result in a quality improvement of up to 1.8 dB as compared to H.264 compression.

关键词： multiview video coding 3d video coding view synthesis warping-based ~predictive coding depth

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