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Conference on Visual Communications and Image Processing (VCIP)

作者： Yan, Tao An, Ping Shen, Liquan Zhang, Zhaoyang Shanghai Univ Sch Commun & Informat Engn Shanghai 200072 Peoples R China Ningbo Univ Technol Coll Elect & Informat Ningbo 315016 Zhejiang Peoples R China Shanghai Univ Key Lab Adv Displays & Syst Applicat Shanghai 200072 Peoples R China

ISBN: (纸本)9780819482341

Rate control has not been well studied for multi-view video coding (MVC). In this paper, we propose an efficient rate control algorithm for MVC by improving the quadratic rate-distortion (R-D) model, which reasonably allocate bit-rate among views based on correlation analysis. The proposed algorithm consists of four levels for rate bits control more accurately, of which the frame layer allocates bits according to frame complexity and temporal activity. Extensive experiments show that the proposed algorithm can efficiently implement bit allocation and rate control according to coding parameters.

关键词： multi-view video coding rate control bit-allocation rate-distortion model correlation analysis

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EVALUATION OF DEPTH COMPRESSION AND view SYNTHESIS DISTORTIONS IN multiview-video-PLUS-DEPTH coding SYSTEMS

EVALUATION OF DEPTH COMPRESSION AND VIEW SYNTHESIS DISTORTIO...

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4th 3DTV Conference on the True Vision - Capture, Transmission and Display of 3D video

作者： El-Yamany, Noha A. Ugur, Kemal Hannuksela, Miska M. Gabbouj, Moncef Tampere Univ Technol Dept Signal Proc Tampere Finland Southern Methodist Univ Dept Elect Engn Dallas TX USA Nokia Res Ctr Tampere Finland

ISBN: (纸本)9781424463794

Several quality evaluation studies have been performed for video-plus-depth coding systems. In these studies, however, the distortions in the synthesized views have been quantified in experimental setups where both the texture and depth videos are compressed. Nevertheless, there are several factors that affect the quality of the synthesized view. Incorporating more than one source of distortion in the study could be misleading;one source of distortion could mask (or be masked by) the effect of other sources of distortion. In this paper, we conduct a quality evaluation study that aims to assess the distortions introduced by the view synthesis procedure and depth map compression in multiview-video-plus-depth coding systems. We report important findings that many of the existing studies have overlooked, yet are essential to the reliability of quality evaluation. In particular, we show that the view synthesis reference software yields high distortions that mask those due to depth map compression, when the distortion is measured by average luma peak signal-to-noise ratio. In addition, we show what quality metric to use in order to reliably quantify the effect of depth map compression on view synthesis quality. Experimental results that support these findings are provided for both synthetic and real multiview-video-plus-depth sequences.

关键词： Depth map compression multi-view video coding video plus depth view synthesis

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Bit-rate adaptive downsampling for the coding of multi-view video with depth information

Bit-rate adaptive downsampling for the coding of multi-view ...

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3DTV Conference - True Vision - Capture, Transmission and Display of 3D video

作者： Ekmekcioglu, Erhan Worrall, Stewart T. Kondoz, Ahmet M. Univ Surrey Ctr Commun Syst Res Surrey GU2 7XH England

ISBN: (纸本)9781424417605

In this paper, the potential for improving the compression efficiency of multi-view video coding with depth information is explored. The proposed technique uses downsampling prior to encoding, for arbitrary views and depth maps. A bit-rate adaptive downscaling-ratio decision approach is proposed for certain views and depth maps prior to encoding. Colour and depth videos are considered separately due to their different characteristics and effects on synthesized free view-point videos. The inter-view references, if present, are downsampled to the same resolution as the input video to be coded. The results for several multi-view with depth sequences indicate that using bit-rate adaptive mixed spatial resolution coding for both views and depth maps can achieve savings in bit-rate, compared to full resolution and fixed depth-to-colour ratio multi-view coding when the quality of synthesized viewpoints are considered. The computational complexity in the encoder is significantly reduced at the same time, since the number of blocks coded is reduced, and hence the number of block mode decisions carried out is reduced.

关键词： multi-view video coding multi-view plus depth mixed resolution coding

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coding-ORIENTED multi-view video COLOR CORRECTION

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Journal of Electronics(China) 2008年第6期25卷 721-727页

作者： Shao Feng Jiang Gangyi Yu Mei Chen Xiexiong Faculty of Information Science and Engineering Ningbo University Ningbo 315211 China National Key Lab of Software New Technology Nanjing University Nanjing 210093 China Department of Information and Electronics Engineering Zhejiang University Hangzhou 310027 China

Color inconsistency between views is an important problem to be solved in multi-view video applications, such as free viewpoint television and other three-dimensional video systems. In this paper, by combining with multi-view video coding, a coding-oriented multi-view video color correction method is proposed. We first separate foreground and background in first Group Of Pictures （GOP） by using SKIP coding mode. Then by transferring means and standard deviations in backgrounds, color correction is performed for each frame in GOP, and multi-view video coding is performed and used to renew the backgrounds. Experimental results ances in color correction and multi-view video show the proposed method can obtain better performcoding.

关键词： multi-view video Color correction multi-view video coding Background

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Fast Mode Decision Using Global Disparity Vector for multiview video coding

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2009年第12期E92A卷 3407-3411页

作者： Han, Dong-Hoon Lee, Yung-Ki Lee, Yung-Lyul Sejong Univ Dept Comp Engn DMS Lab Seoul South Korea

Since multiview video coding (MVC) based on H.264/AVC uses a prediction scheme exploiting inter-view correlation among multiview video, MVC encoder compresses multiple views more efficiently than simulcast H.264/AVC encoder. However, in case that the number of views to be encoded increases in MVC, the total encoding time will be greatly increased. To reduce computational complexity in MVC, a fast mode decision using both Macroblock-based region segmentation information and global disparity vector among views is proposed to reduce the encoding time. The proposed method achieves on the average 1.5 similar to 2.9 reduction of the total encoding time with the PSNR (Peak Signal-to-Noise Ratio) degradation of about 0.05 dB.

关键词： multi-view video coding H.264/AVC fast mode decision disparity vector

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FRAMEWORKS FOR FTV coding

FRAMEWORKS FOR FTV CODING

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Picture coding Symposium 2009

作者： Tanimoto, Masayuki Wildeboer, Menno Nagoya Univ Grad Sch Engn Chikusa Ku Nagoya Aichi 4648603 Japan

ISBN: (纸本)9781424445936

We have developed a new type of television named FTV (Free viewpoint TV). FTV is an innovative media that enables us to view a 3D scene by freely changing Our viewpoints. FTV will be widely used since it is an ultimate 3DTV, a natural interface between human and environment, and an innovative tool to create new types of content and art. FTV has been contributing to the standardization of MVC (multi-view video coding) and 3DV (3D video) at MPEG. MVC is the first phase of FTV and 3DV is the second phase of FTV. An FTV system can be constructed in various ways, but typically includes multiple viewpoint video capture, image correction, depth estimation, coding/decoding and view interpolation. coding is related to view generation in FTV. In this paper, 4 frameworks for FTV coding are discussed and an FTV data format as a combination of FTV data units is proposed.

关键词： FTV 3DTV multi-view video coding depth estimation view synthesis 3D video

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OVERview OF FTV (FREE-viewPOINT TELEVISION)

OVERVIEW OF FTV (FREE-VIEWPOINT TELEVISION)

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IEEE International Conference on multimedia and Expo

作者： Tanimoto, Masayuki Nagoya Univ Grad Sch Engn Chikusa Ku Nagoya Aichi 4648603 Japan

ISBN: (纸本)9781424442904

We have developed a new type of television named FTV (Free-viewpoint TV). FTV is an innovative visual media that enables us to view a 3D scene by freely changing our viewpoints. We constructed the world's first real-time FTV system including the complete chain from capturing to display. We have also developed new type of ray capture and display technologies such as a 360-degree mirror-scan ray capturing system and a 360 degree ray-reproducing display. MPEG has been conducting the standardization activities of FTV. The first phase of FTV was multi-view video coding and the second phase is 3D video.

关键词： FTV Free-viewpoint TV ray-space multi-view video coding 3D video

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Virtual view Interpolation and Prediction Structure for Full Parallax multi-view video

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10th Pacific Rim Conference on multimedia

作者： Chung, Tae-Young Jung, Il-Lyong Song, Kwanwoong Kim, Chang-Su Korea Univ Sch Elect Engn Seoul South Korea

ISBN: (纸本)9783642104664

In this work, we propose virtual view interpolation algorithm and prediction structure for full parallax multi-view video coding The proposed virtual view interpolation algorithm estimates the disparity information by bilateral criterion and disparity smoothness The interpolated view is used as additional reference frame, and novel direct mode is applied to it, Simulation results demonstrate that our proposed virtual view interpolation algorithm shows the better quality than the conventional interpolation algorithm Moreover, the proposed prediction structure, which uses the interpolated view as an additional reference with novel direct mode, shows the significant coding gain

关键词： multi-view video coding view interpolation prediction bilateral criterion

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RATE-DISTORTION ANALYSIS OF RECTIFICATION-BASED view INTERPOLATION FOR multiview video coding

RATE-DISTORTION ANALYSIS OF RECTIFICATION-BASED VIEW INTERPO...

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IEEE International Conference on multimedia and Expo

作者： Xiu, Xiaoyu Liang, Jie Simon Fraser Univ Sch Engn Sci Burnaby BC V5A 1S6 Canada

ISBN: (纸本)9781424442904

view interpolation has been applied in multiview view coding. However, existing schemes assume all cameras are aligned. These methods may not perform well when neighboring cameras point to different directions. In this paper, we apply the rectification based view interpolation to MVC. We first derive the theoretical performance gain of the rectification based view interpolation over existing interpolation method. We then analyze the rate-distortion performance of the proposed MVC method, and compare with the disparity compensation based MVC and view interpolation based MVC without rectification. The analyses show that view rectification can offer additional coding gain over existing view interpolation based MVC, especially when the disparity estimation is accurate and when the neighboring cameras are close to each others. Preliminary experimental results are provided to verify the theoretical analysis.

关键词： Rate distortion multi-view video coding view interpolation view rectification

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LOW-DELAY RANDOM view ACCESS IN multi-view coding USING A BIT-RATE ADAPTIVE DOWNSAMPLING APPROACH

LOW-DELAY RANDOM VIEW ACCESS IN MULTI-VIEW CODING USING A BI...

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IEEE International Conference on multimedia and Expo (ICME 2008)

作者： Ekmekcioglu, Erhan Worrall, Stewart T. Kondoz, Ahmet M. Univ Surrey Ctr Commun Syst Res Surrey GU2 7XH England

ISBN: (纸本)9781424425709

In this paper, a new multi-view coding (MVC) scheme is proposed and evaluated. The scheme offers improved low-delay view random access capability and at the same time comparable compression performance with respect to the reference multi-view coding scheme currently used. The proposed scheme uses the concept of multiple-resolution view coding, exploiting the trade-off between quantization distortion and downsampling distortion at changing bit-rates, which in turn provides improved coding efficiency. Bipredictive (B) coded views, used in the conventional MVC method, are replaced with predictive coded downscaled views, reducing the view dependency in a multi-view set and hence reducing the random view access delay, but preserving the compression performance at the same time. Results show that the proposed method reduces the view random access delay in a MVC system significantly, but has a similar objective and subjective performance with the conventional MVC method.

关键词： multi-view video coding view random access multi resolution video coding

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