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3D-HEVC visual quality assessment: Database and bitstream model

3D-HEVC visual quality assessment: Database and bitstream mo...

引用

International Workshop on Quality of Multimedia Experience, QoMEx

作者： Wei Zhou Ning Liao Zhibo Chen Weiping Li CAS Key Laboratory of Technology in Geo-spatial Information Processing and Application System University of Science and Technology of China Hefei China

ISBN: (纸本)9781509003556

Visual Quality Assessment of 3D/stereoscopic video (3D VQA) is significant for both quality monitoring and optimization of the existing 3D video services. In this paper, we build a 3D video database based on the latest 3D-HEVC video coding standard, to investigate the relationship among video quality, depth quality, and overall quality of experience (QoE) of 3D/stereoscopic video. We also analyze the pivotal factors to the video and depth qualities. Moreover, we develop a No-Reference 3D-HEVC bitstream-level objective video quality assessment model, which utilizes the key features extracted from the 3D video bitstreams to assess the perceived quality of the stereoscopic video. The model is verified to be effective on our database as compared with widely used 2D Full-Reference quality metrics as well as a state-of-the-art 3D FR pixel-level video quality metric.

关键词： Quality assessment Three-dimensional displays Video recording Databases Stereo image processing Visualization Cameras

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Saliency & structure preserving multi-operator image retargeting

Saliency & structure preserving multi-operator image retarge...

引用

International Conference on Acoustics, Speech, and Signal processing (ICASSP)

作者： Lingling Zhu Zhibo Chen Xiaoming Chen Ning Liao University of Science and Technology of China CAS Key Laboratory of Technology in Geo-spatial Information Processing and Application System Hefei China

ISBN: (纸本)9781479999897

Content-aware image retargeting has attracted substantial research interests in the related research community. However, so far there is still no method can preserve important image contents and structure well without introducing deformation. To address this problem, we propose a Saliency & Structure Preserving Multi-operator (SSPM) method. SSPM classifies images into three categories utilizing SIFT density to improve performance of saliency preservation, helping to mitigate negative influence from center-bias property of most existing saliency detection models. SSPM also employs different principles to improve structure preservation performance, including Earth Mover's Distance (EMD) and Gray-Level Cooccurrence Matrix (GLCM) to get optimal operator sequences for smart content-aware image retargeting. SSPM method not only can well preserve salient contents and structure, but also can greatly improve deformation resilience. Experimental results demonstrated that our method outperforms state-of-art image retargeting methods.

关键词： Distortion Feature extraction Resilience Earth Loss measurement Visualization Visual perception

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Hierarchical quadtree-based flexible block ordering in HEVC intra coding

Hierarchical quadtree-based flexible block ordering in HEVC ...

引用

IEEE Visual Communications and Image processing (VCIP)

作者： Lei Guo Dong Liu Li Li Feng Wu CAS Key Laboratory of Technology in Geo-Spatial Information Processing and Application System University of Science and Technology of China Hefei China

ISBN: (纸本)9781509053179

In all of the existing block-based image and video coding standards, blocks are processed in the fixed scan order. Then in HEVC intra coding, intra prediction is always based on the top and/or left neighboring reconstructed pixels, which incurs less accurate prediction for blocks where the spatial correlation is not along the topleft-to-bottomright direction. To obtain better intra prediction, we propose to flexibly determine the coding order of blocks in HEVC intra coding. Complying with the hierarchical quadtree structure in HEVC, our flexible block ordering (FBO) technique recursively decides the coding order of four sub-blocks when splitting one block. Moreover, we propose new methods to perform inter/extrapolation for intra prediction so as to fully utilize neighboring reconstructed pixels, not always being top/left. Experimental results show that our proposed FBO technique achieves on average 2.9% BD-rate reduction compared to HEVC baseline.

关键词： Encoding High efficiency video coding Image reconstruction Correlation Standards Interpolation Copper

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Visual tracking via an ensemble of random classifiers

Visual tracking via an ensemble of random classifiers

引用

IEEE International Conference on Real-time Computing and Robotics (RCAR)

作者： Yichun Shi Hesheng Wang Department of Computer Science Shanghai Jiao Tong University Shanghai China Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Shanghai China

ISBN: (纸本)9781467389600

One largest problem for tracking-by-detection methods is the incomplete and noisy training set. Occlusion, illumination and many other problems could lead to this problem. Models that are not adaptive enough would fail to track the target when drastic appearance change takes place. Adaptive ones, although keep tracking at first, could lose the target because of learning too many incorrect samples. In this paper, we present an ensemble model of random classifiers updated on different dataset. When the appearance of the target changes drastically and some sub-models are confused, the others could help correct the tracking result. A latent variable is added for choosing sub-models and it naturally leads to predicting the new samples with a weighted sum of sub-models. To calculate the weight, we add a generative model to each random classifier. Experiments show that our method could track the target robustly and accurately.

关键词： Target tracking Training Visualization Noise measurement Robustness Lighting Adaptation models

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Deeply Exploit Depth information for Object Detection

Deeply Exploit Depth Information for Object Detection

引用

IEEE Computer Society Conference on Computer Vision and Pattern Recognition Workshops (CVPRW)

作者： Saihui Hou Zilei Wang Feng Wu CAS Key Laboratory of Technology in Geo-spatial Information Processing and Application System University of Science and Technology of China Hefei China

This paper addresses the issue on how to more effectively coordinate the depth with RGB aiming at boosting the performance of RGB-D object detection. Particularly, we investigate two primary ideas under the CNN model: property derivation and property fusion. Firstly, we propose that the depth can be utilized not only as a type of extra information besides RGB but also to derive more visual properties for comprehensively describing the objects of interest. So a two-stage learning framework consisting of property derivation and fusion is constructed. Here the properties can be derived either from the provided color/depth or their pairs (e.g. the geometry contour adopted in this paper). Secondly, we explore the fusion method of different properties in feature learning, which is boiled down to, under the CNN model, from which layer the properties should be fused together. The analysis shows that different semantic properties should be learned separately and combined before passing into the final classifier. Actually, such a detection way is in accordance with the mechanism of the primary neural cortex (V1) in brain. We experimentally evaluate the proposed method on the challenging dataset, and have achieved state-of-the-art performance.

关键词： Object detection Visualization Image color analysis Feature extraction Geometry Gravity Computer vision

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Combining directional intra prediction and intra block copy with block partition for HEVC

Combining directional intra prediction and intra block copy ...

引用

IEEE International Conference on Image processing

作者： Yue Li Li Li Dong Liu Houqiang Li Feng Wu CAS Key Laboratory of Technology in Geo-spatial Information Processing and Application System University of Science and Technology of China Hefei China

The directional intra prediction (DIP) modes in HEVC are capable of predicting local continuous image features. Recently, intra block copy (IBC) is proposed for screen content coding, aiming at predicting non-local recurrent image features. For natural video, we observe that recurrent features are often irregular and not aligned with blocks. Thus, we propose a combination of DIP and IBC with block partition for better intra prediction, where one block can be divided into several partitions, each of which may choose between DIP and IBC. We study an intra prediction scheme with the proposed combination, especially the rate-distortion optimization and entropy coding in the scheme. Preliminary experimental results show that the proposed combined intra prediction achieves as high as 5.8% bit-rate saving compared to HEVC anchor.

关键词： Electronics packaging Rate-distortion Optimization Entropy coding Motion estimation Complexity theory

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An Improved Robust Model Predictive control for Uncertain systems with Input Saturation 34

An Improved Robust Model Predictive Control for Uncertain Sy...

引用

第三十四届中国控制会议

作者： Han Huaxiang Zhang Xiaohua Zhang Weidong Depatment of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China

ISBN: (纸本)9781467374439

In this paper, we propose an improved robust model predictive control method for uncertain polytopic systems with input saturation constraints. For the synthesis of the robust controllers, a sequence of feedback control laws and a parameterdependent Lyapunov function are utilized to further reduce the conservativeness and improve control performance. The state feedback control law is obtained by the solution of the convex optimization problem involving linear matrix inequalities(LMI)at each time step. The effectiveness of the proposed algorithm is demonstrated by a numerical example.

关键词： Min-max model predictive control,Uncertain systems,Input saturation

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Regional Coupling based Synchronization control of Multi-motor Driving TBM Cutterhead system 34

Regional Coupling based Synchronization Control of Multi-mot...

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第三十四届中国控制会议

作者： HU Tao WANG Jing Cheng ZHANG Lang Wen Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China

ISBN: (纸本)9781467374439

Tunnel boring machine(TBM) is widely used in long deep tunnel construction with its advantages of high efficiency, safety and low manpower. Cutterhead driving system provides power for excavating rocks and is an important component of TBM. Since the cutterhead system is driven by multiple induction motors, the synchronization control of multi-motor is critical important for high efficient excavating. The driving motors have to bear different excavating loads due to the uneven distribution of soils acting on the cutterhead surface. In this paper, all the driving motors are divided into two regions and a regional coupling based synchronization control strategy is proposed for the TBM cutterhead system. The dynamical induction motor model for vector control is established through coordinate transformation. The synchronous control of motors in each region is achieved by designing a master-slave motor control strategy. To deal with the torque difference between two regions, a fuzzy logic PID coordination controller is proposed for the master motors. Then, the synchronous control of driving motors is achieved by the presented regional coupling control strategy. The proposed synchronization control strategy is validated by simulating on multi-motor driving TBM cutterhead system for constant load torque and varying load torques, respectively. Compared with the single master-slave control, the proposed regional coupling control can achieve quicker dynamic response and better synchronization performance.

关键词： TBM,multi-motor synchronization,vector control,regional coupling

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Leader-follower Consensus for Multi-agent systems with Lipschitz-Type Node Dynamics and Jointly Connected Dynamical Topology 34

Leader-follower Consensus for Multi-agent Systems with Lipsc...

引用

第三十四届中国控制会议

作者： WANG Bohui WANG Jingcheng ZHANG Langwen ZHANG Yi Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information ProcessingMinistry of Education of China

ISBN: (纸本)9781467374439

Leader-follower consensus is addressed in this paper for multi-agent systems with Lipschitz-type node dynamics and jointly connected dynamical topology. The main contribution of this works is to solve the leader-follower consensus problem with the general assumption that the network topology is specifically given and connected being removed. By considering the underlying communication graph for dynamic interaction topology, a bounded condition of consensus speed is proposed. By considering a combination of state information of follower and leader agents, a class of leader-follower consensus protocol is designed with the appropriate consensus speed. By appropriately constructing Lyapunov function, it is proved that the leader-follower consensus for the closed-loop multi-agent systems with Lipschitz-Type node dynamics and jointly connected dynamical topology can be achieved with carefully selected feedback gain matrix. Finally, one simulation example is presented to verify the proposed approach and demonstrate its effectiveness.

关键词： Leader-follower consensus,consensus,dynamic interaction topology,intermittent communication,information consensus protocols

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Dynamic Modeling and Validation of the Boiler-side Whole Process of Subcritical Coal-fired Power Plants 34

Dynamic Modeling and Validation of the Boiler-side Whole Pro...

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第三十四届中国控制会议

作者： XU Liang YUAN Jingqi Department of Automation Shanghai Jiao Tong Universityand the Key Laboratory of System Control and Information ProcessingMinistry of Education of China

ISBN: (纸本)9781467374439

Dynamic modeling of the utility boiler is the basis of operation optimization of the coal-fired power plant. In this paper, the boiler-side whole process dynamic models of the subcritical coal-fired unit are established based on the dynamic mass and energy balance. The models cover the important heat transfer facilities on the boiler side, including the evaporation system, superheaters, reheaters, and economizer. The energy storage or release in the metal wall of these facilities and all the heat losses are also considered in the models. At last, the pseudo-online simulation based on presented models is carried out with the history data captured by the distribution control system of a real coal-fired power plant. It is found that model-based calculated total input energy is in good agreement with the offline assay value, which suggests the effectiveness of the presented models. The models have the potential for online process monitoring and operation optimization of the unit.

关键词： dynamic modeling,boiler-side whole process,subcritical coal-fired unit,operation optimization

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