We show non-essentiality of using a correlation between an image and a depthmap for depth-image-based rendering (DIBR), when we use an accurate depthmap. For coding of DIBR, an edge preserving filter, which jointly ...
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ISBN:
(纸本)9781479947584
We show non-essentiality of using a correlation between an image and a depthmap for depth-image-based rendering (DIBR), when we use an accurate depthmap. For coding of DIBR, an edge preserving filter, which jointly use the image and the depthmap, as a post filter is a suitable approach. The joint filter not only removes coding distortion, but also improves accuracy of the coded depthmap itself. Considering the development 3D technology, the accuracy of the input depthmap will be improved. If we use an accurate depthmap, e.g. the ground truth, the accuracy improvement of the joint filter becomes little. To reveal the fact, we use various codecs (JPEG, JPEG2000, and H.264/AVC) and use two state-of-the-arts filters, which are the post filter set as the non-joint filter, and the weighed mode filter as the joint filter. Experimental results show that the post filters do not require the joint image, and self-sustained types of the non-joint filter have better performance.
New data formats that include both video and the corresponding depthmaps, such as multiview plus depth (MVD), enable new video applications in which intermediate video views (virtual views) can be generated using the...
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ISBN:
(纸本)9780819479365
New data formats that include both video and the corresponding depthmaps, such as multiview plus depth (MVD), enable new video applications in which intermediate video views (virtual views) can be generated using the transmitted/stored video views (reference views) and the corresponding depthmaps as inputs. We propose a depth map coding method based on a new distortion measurement by deriving relationships between distortions in coded depthmap and rendered view. In our experiments we use a codec based on H.264/AVC tools, where the rate-distortion (RD) optimization for depth encoding makes use of the new distortion metric. Our experimental results show the efficiency of the proposed method, with coding gains of up to 1.6 dB in interpolated frame quality as compared to encoding the depthmaps using the same coding tools but applying RD optimization based on conventional distortion metrics.
An H.264-based fast 3-D video compression algorithm is presented by reducing coding complexity of P slices in a depthmap sequence using a fast-mode decision scheme. On the basis of the relationship of coding modes of...
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An H.264-based fast 3-D video compression algorithm is presented by reducing coding complexity of P slices in a depthmap sequence using a fast-mode decision scheme. On the basis of the relationship of coding modes of collocated macroblocks on texture and depth frames, an early SKIP-mode decision scheme and a selective prediction-mode decision scheme have been developed to rapidly encode depthmap sequences. Experimental results show that the algorithm can save the entire encoding time by 79% on average compared to conventional a depthmap sequence coding algorithm, while introducing only negligible loss in peak signal-to-noise ratio value. (C) 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.3533026]
We present an intracoding method that is applicable to depth map coding in multiview plus depth systems. Our approach combines skip prediction and plane segmentation-based prediction. The proposed depth intraskip pred...
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We present an intracoding method that is applicable to depth map coding in multiview plus depth systems. Our approach combines skip prediction and plane segmentation-based prediction. The proposed depth intraskip prediction uses the estimated direction at both the encoder and decoder, and does not need to encode residual data. Our plane segmentation-based intraprediction divides the current block into biregions, and applies a different prediction scheme for each segmented region. This method avoids incorrect estimations across different regions, resulting in higher prediction accuracy. Simulation results demonstrate that the proposed scheme is superior to H.264/advanced video coding intraprediction and has the ability to improve the subjective rendering quality. (C) 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
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 depthmap distortion relat...
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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 depthmap distortion related to an energy minimization in such a way that additional sharp edge information of depthmaps 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 depthcoding 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.
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 depthmap distortion relat...
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ISBN:
(纸本)9781479984671
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 depthmap distortion related to an energy minimization in such a way that additional sharp edge information of depthmaps 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 depthcoding 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.
This paper proposed a new fast intra prediction algorithm based on fast edge detection and CU partition for depthmap to reduce the coding complexity of Multiview Video Plus depth (MVD) coding in HEVC. The latest vide...
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ISBN:
(纸本)9781510821279
This paper proposed a new fast intra prediction algorithm based on fast edge detection and CU partition for depthmap to reduce the coding complexity of Multiview Video Plus depth (MVD) coding in HEVC. The latest video coding standard HEVC greatly improves the coding complexity of intra prediction because of complex coding unit (CU) partition and lots of prediction modes. depthmaps always have smooth regions separated by sharp edges. Smooth regions can help to speed up the CU partition and reduce the time of intra mode decision, and sharp edges must be protected to ensure the quality of synthetic viewpoints. In the new algorithm, an equation and a threshold T are used to detect whether there are edges in current CU. To different kinds of CU, different intra mode decision methods are taken. After simulation, the experimental results show that the proposed algorithm significantly reduces the coding times, while maintaining high bitrate and PSNR performance in comparison with original HEVC algorithm.
This paper presents an efficient view synthesis distortion estimation method for 3-D video. It also introduces the application of this method to Advanced Video coding (AVC)- and High Efficiency Video coding (HEVC)-com...
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This paper presents an efficient view synthesis distortion estimation method for 3-D video. It also introduces the application of this method to Advanced Video coding (AVC)- and High Efficiency Video coding (HEVC)-compatible 3-D video coding. Although the proposed view synthesis distortion scheme is generic, its use for actual 3-D video codec systems addresses the many issues caused by different video-coding formats and restrictions. The solutions for these issues are herein proposed. The simulation results show that the proposed scheme can achieve approximately 5.4% and 10.2% coding gains for AVC- and HEVC-compatible 3-D coding, respectively. In addition, the results show the remarkable complexity reduction of the scheme compared to the view synthesis optimization method currently used in 3-D-HEVC. The proposed method has been adopted into the presently developing AVC- and HEVC-compatible test model reference software.
Incolour plus depthmap 3D video, depthmap is a luminance image that aids the virtual views generation. Since it is not the final image viewed by end user, the conventional depthmap compression method, which minimiz...
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ISBN:
(纸本)9781479939039
Incolour plus depthmap 3D video, depthmap is a luminance image that aids the virtual views generation. Since it is not the final image viewed by end user, the conventional depthmap compression method, which minimizes the pixel errors of the depthmap, introduces more distortions to the virtual rendered images. In this paper, a novel motion estimation scheme for depth map coding is proposed. By employing rendered view distortion in Rate-Distortion Optimization, the optimal Motion Vector is determined to improve the rendered views quality. An effective Lagrange multiplier is also derived. Experimental results illustrate that 34%-63% of bit can be saved comparing to the conventional motion estimation method.
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. H...
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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.
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