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Fast Residual Quad-Tree Coding for the Emerging High Efficiency Video Coding Standard

China Communications 2013年第10期10卷 155-166页

作者：张永飞李哲赵明菲李波 Beijing Key Laboratory of Digital Media School of Computer Science and Engineering Beihang University State Key Laboratory of Virtual Reality Technology and Systems Beihang University

In High Efficiency Video Coding, the Residual Quad-Yree （RQT） coding is used to encode the prediction residual for both intra and inter Coding Units （CU） and provides improved coding gains. However, this results in much higher computational complexities. To address this problem, we develop two fast RQT algorithms for intra- and inter-prediction residual coding respectively. For intra coding, the proposed algorithm selects the best prediction mode in the rate distortion mode decision process using a Prediction Unit （PU） size-dependent fast RQT depth decision on a reduced prediction mode candidates set from the rough mode decision process. For inter coding, in addition to CU size-dependent fast RQT depth decisions, we propose a discriminant analy- sis-based fast depth decision algorithm to det- ermine the best transform unit size. Experimental results show that on average, we can real- ise a 21.29% encoding time saving and 0.03% bit-rate reduction for intra coding, while 15% of the encoding time can be saved with a negligible coding performance loss for inter coding.

关键词： HEVC RQT intra coding inter coding

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VRBAC: An extended RBAC model for virtualized environment and its conflict checking approach

VRBAC: An extended RBAC model for virtualized environment an...

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2nd CCF Internet Conference of China, ICoC 2013

作者： Luo, Yang Li, Yazhuo Tang, Qing Wei, Zhao Xia, Chunhe Beijing Key Laboratory of Network Technology Beihang University Beijing China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9783642539589

This paper extends RBAC's authorizing ability via adding domain and virtual machine features aiming at applying in the virtu-alized scenarios. We define a new model named VRBAC in which authorized users can migrate or copy virtual machines from one domain to another without causing a conflict. Subjects can also share permissions of not only resources but also virtual machines with other subjects from the same or different domains. Three types of conflicts in VRBAC policies are discussed and described in form of description logic, which provides extra access to reasoning engines and facilitates the conflict checking procedure. Based on Active Directory and Xen Cloud Platform, VRBAC model visualization and its conflict checking can be enforced within the prototype system. The experimental results indicate that all conflicts can be effectively detected and the literal report generated can provide conflict details such as conflict types, positions and causes as guidance for further conflict resolution. © Springer-Verlag Berlin Heidelberg 2013.

关键词： virtualization

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On the spatial-Temporal Reachability of DTNs

On the spatial-Temporal Reachability of DTNs

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2nd CCF Internet Conference of China, ICoC 2013

作者： Zhang, Cheng Xia, Chunhe Wang, Haiquan Li, Xiaojian Beijing Key Laboratory of Network Technology Beihang University Beijing China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China College of Software Beihang University Beijing China College of Computer Science and Information Technology Guangxi Normal University Guilin China

ISBN: (纸本)9783642539589

As traditional "Connectivity" concept from the Internet ignores the possibility of opportunistic contacts in DTNs, this paper brings time dimension into consideration, proposes Spatial-Temporal Path, Spatial-Temporal Reachability and K-Reachability in order to better describe the whole communication process and "Eventual Transportability" of DTN. Analytical and simulation results are given to show the correctness of our approach. Furthermore, Spatial-Temporal Reachability and K-Reachability, which tell a network's robustness in a quantitative fashion, are proved to be suitable for analyzing efficiency and routing performance of DTNs. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Connectivity DTN Spatial-Temporal Reachability

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Laser Sheet Scanning Based Smoke Acquisition and Reconstruction

Laser Sheet Scanning Based Smoke Acquisition and Reconstruct...

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2013中国虚拟现实大会暨ICVRV'2013

作者： Xin Gao Yong Hu Qing Zuo Yue Qi State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Technology Beihang University BeijingChina

This paper develops a laser sheet scanning based technique for capturing and reconstructing sequential volumetric models of ***,a dedicated setup is introduced as the laser sheet illuminator in horizontal *** achieve an accurate acquisition,a signal synchronized scheme is added between the galvanometer and the high-speed ***,with a laser sheet sweeping through the volume repeatedly,the illuminated smoke slices are *** sweep of the laser records a near-simultaneous smoke density *** next reconstruction procedure,through camera and laser calibrations,3D real positions of the pixels of captured images is ***,these irregular smoke density fields are resampled by a 3D original Kriging interpolation algorithm and are reconstructed to regular smoke volumetric *** experimental results,the fidelity of visualized smoke volumetric models reconstructed by our smoke modeling method demonstrates that our approach can make a good effect on realistic smoke modeling.

关键词： Laser sheet scanning Smoke acquisition Volume reconstruction Kiring interpolation

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HintVis:The Hierarchical Visualization of Network Traffic Data

HintVis:The Hierarchical Visualization of Network Traffic Da...

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2013中国虚拟现实大会暨ICVRV'2013

作者： Hengyuan Zhang Xiaowu Chen Haifeng Hu State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University BeijingChina

The network traffic data is interpreted differently by people in different *** paper proposes a framework for hierarchically visualizing the network traffic data,and customizes a set of the classic approaches or algorithms to produce visualizations in different *** on the framework,we developed a prototype system HintVis to support analyzing network traffic data in different levels by constructing layered semantic network traffic objects and producing hierarchical *** usability of HintVis is demonstrated by visualizing packets going through the gateway in a *** on the hierarchical visualizations,analysts are able to semantically navigate in the network traffic data and concentrate on what they need.

关键词： Network Traffic Hierarchical Visualization User Interface

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Geometric Based Structure Propagation and Texture Matching for 3D Texture Completion

Geometric Based Structure Propagation and Texture Matching f...

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2013中国虚拟现实大会暨ICVRV'2013

作者： Kan Guo Xiaowu Chen Yili Liu Bin Zhou Yu Guo State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang UniversityBeijingChina

This paper proposes a novel method to complete the missing appearance of mesh surfaces through structure propagation and texture *** advance,the appearance on surfaces is divided into structure and texture ***,the missing structures are predicted through structure *** structure propagation is guided by surfaces geometric features by using 3D tensor voting and crest line ***,with the guidance of predicted structures,the optimal local sample patches are matched to inpaint the missing ***,the completed result is obtained by mapping the optimal patches to the missing texture regions on *** acquire convincing completion results as shown in the experiments and comparisons.

关键词： structure propagation texture completion tensor voting

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UNSUPERVISED IMAGE SEGMENTATION USING GLOBAL SPATIAL CONSTRAINT AND MULTI-SCALE REPRESENTATION ON MULTIPLE SEGMENTATION PROPOSALS

UNSUPERVISED IMAGE SEGMENTATION USING GLOBAL SPATIAL CONSTRA...

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IEEE International Conference on Image Processing

作者： Linjia Sun Xiaohui Liang State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing 100191 China

ISBN: (纸本)9781479923427

This paper presents a novel method for unsupervised image segmentation. The method determines the reasonable segments for final segmentation by exploiting both global and local context cues on multiple segmentation proposals. The proposal is obtained by using any existing segmentation algorithms, providing the diverse segment cues to guide segmentation. An iterative process is used to perform the cues integration and the image segmentation, including the segments modeling and the segments labeling. The former estimates the distribution of shared segments, while the latter labels each proposal into segments by minimizing an energy function. The final segmentation is produced when the consistent spatial layout is found in different proposals. Compared with the existing methods, the segmentation results are more satisfying on the Berkeley Segmentation Database.

关键词： Unsupervised segmentation spatial layout segmentation proposals multi-scale representation space layout image segmentation segmentation Segmentation multi-scale Segments images

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Visualizing Network Communication in Geographic Environment

Visualizing Network Communication in Geographic Environment

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2013中国虚拟现实大会暨ICVRV'2013

作者： Haifeng Hu Hengyuan Zhang Wei Li State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engine Computer and Information Science Southwest University Chongqing China

Geographic network visualization lay out the data with respect to the physical location of nodes in the *** paper presents a method for visualizing network communication in geographic *** method first simplifies GIS data and aggregates network communication data according to both geographic distribution and network topology,and then followed by selecting and highlighting main communication ***,the layout of some nodes is adjusted in the *** using our method,the network communication data can be visualized in geographic environment aesthetically and *** developed a prototype system to help analysts and users understanding the characteristics and patterns of the networks communication.

关键词： Network Communication Visualization Geographic

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MULTI-SCALE, MULTI-LEVEL, HETEROGENEOUS FEATURES EXTRACTION AND CLASSIFICATION OF VOLUMETRIC MEDICAL IMAGES

MULTI-SCALE, MULTI-LEVEL, HETEROGENEOUS FEATURES EXTRACTION ...

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IEEE International Conference on Image Processing

作者： Shuai Li Qinping Zhao Shengfa Wang Aimin Hao Hong Qin State Key Laboratory of Virtual Reality Technology and Systems Beihang University China Department of Computer Science Stony Brook University USA

ISBN: (纸本)9781479923427

This paper articulates a novel method for the heterogeneous feature extraction and classification directly on volumetric images, which covers multi-scale point feature, multi-scale surface feature, multi-level curve feature, and blob feature. To tackle the challenge of complex volumetric inner structure and diverse feature forms, our technical solution hinges upon the integrated approach of locally-defined diffusion tensor (DT), DT-based anisotropic convolution kernel (DACK), DACK-based multi-scale analysis, and DT-governed curve feature growing. The extracted structural features can be further semantically classified. At the computational fronts, we design CUDA-based algorithm to conduct parallel computation for time consuming tasks. Various experiments and timing tests demonstrate the effectiveness, robustness, and high performance of our method.

关键词： Volumetric image Multi-scale heterogeneous features Curve propagation Diffusion tensor CUDA Feature extraction images multi-scale multilayers PARALLEL PROCESSING (computerS) HIGH-PERFORMANCE Taxonomy

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Image Matting with Local and Nonlocal Smooth Priors

Image Matting with Local and Nonlocal Smooth Priors

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IEEE Conference on computer vision and Pattern Recognition

作者： Xiaowu Chen Dongqing Zou Steven ZhiYing Zhou Qinping Zhao Ping Tan State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Department of Electrical & Computer Engineering National University of Singapore

ISBN: (纸本)9781467364102

In this paper we propose a novel alpha matting method with local and nonlocal smooth priors. We observe that the manifold preserving editing propagation [4] essentially introduced a nonlocal smooth prior on the alpha matte. This nonlocal smooth prior and the well known local smooth prior from matting Laplacian complement each other. So we combine them with a simple data term from color sampling in a graph model for nature image matting. Our method has a closed-form solution and can be solved efficiently. Compared with the state-of-the-art methods, our method produces more accurate results according to the evaluation on standard benchmark datasets.

关键词： Graphical models standardized benchmark Imagery (Psychotherapy) Image images Adrenergic alpha-Antagonists editing Laplacian operator

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