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Real-time human segmentation by BowtieNet and a SLAM-based human AR system

Virtual Reality & Intelligent Hardware 2019年第5期1卷 511-524页

作者： Xiaomei ZHAO Fulin TANG yihong wu National Laboratory of Pattern Recognition Institute of AutomationChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Background Generally, it is difficult to obtain accurate pose and depth for a non-rigid moving object from a single RGB camera to create augmented reality (AR). In this study, we build an augmented reality system from a single RGB camera for a non-rigid moving human by accurately computing pose and depth, for which two key tasks are segmentation and monocular Simultaneous Localization and Mapping (SLAM). Most existing monocular SLAM systems are designed for static scenes, while in this AR system, the human body is always moving and non-rigid. Methods In order to make the SLAM system suitable for a moving human, we first segment the rigid part of the human in each frame. A segmented moving body part can be regarded as a static object, and the relative motions between each moving body part and the camera can be considered the motion of the camera. Typical SLAM systems designed for static scenes can then be applied. In the segmentation step of this AR system, we first employ the proposed BowtieNet, which adds the atrous spatial pyramid pooling (ASPP) of DeepLab between the encoder and decoder of SegNet to segment the human in the original frame, and then we use color information to extract the face from the segmented human area. Results Based on the human segmentation results and a monocular SLAM, this system can change the video background and add a virtual object to humans. Conclusions The experiments on the human image segmentation datasets show that BowtieNet obtains state-of-the-art human image segmentation performance and enough speed for real-time segmentation. The experiments on videos show that the proposed AR system can robustly add a virtual object to humans and can accurately change the video background.

关键词： Augmented reality Moving object Reconstruction and tracking Camera pose Human segmentation

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High-quality indoor scene 3D reconstruction with RGB-D cameras:A brief review

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Computational Visual Media 2022年第3期8卷 369-393页

作者： Jianwei Li Wei Gao yihong wu Yangdong Liu Yanfei Shen School of Sports Engineering Beijing Sports UniversityBeijing 100084China National Laboratory of Pattern Recognition Institute of AutomationChinese Academy of SciencesBeijing 100080China University of Chinese Academy of Sciences Beijing 100049China Huawei Technologies Co. Ltd.Beijing 100085China

High-quality 3D reconstruction is an important topic in computer graphics and computer vision with many applications,such as robotics and augmented *** advent of consumer RGB-D cameras has made a profound advance in indoor scene *** the past few years,researchers have spent significant effort to develop algorithms to capture 3D models with RGB-D *** depth images produced by consumer RGB-D cameras are noisy and incomplete when surfaces are shiny,bright,transparent,or far from the camera,obtaining highquality 3D scene models is still a challenge for existing *** here review high-quality 3D indoor scene reconstruction methods using consumer RGB-D *** this paper,we make comparisons and analyses from the following aspects:(i)depth processing methods in 3D reconstruction are reviewed in terms of enhancement and completion,(ii)ICP-based,feature-based,and hybrid methods of camera pose estimation methods are reviewed,and(iii)surface reconstruction methods are reviewed in terms of surface fusion,optimization,and *** performance of state-of-the-art methods is also compared and *** survey will be useful for researchers who want to follow best practices in designing new high-quality 3D reconstruction methods.

关键词： 3D reconstruction image processing camera pose estimation surface fusion

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A survey: which features are required for dynamic visual simultaneous localization and mapping?

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Visual Computing for Industry,Biomedicine,and Art 2021年第1期4卷 183-198页

作者： Zewen Xu Zheng Rong yihong wu School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100049China National Laboratory of Pattern Recognition Institute of AutomationChinese Academy of SciencesBeijing 100190China

In recent years,simultaneous localization and mapping in dynamic environments(dynamic SLAM)has attracted significant attention from both academia and *** pioneering work on this technique has expanded the potential of robotic *** to standard SLAM under the static world assumption,dynamic SLAM divides features into static and dynamic categories and leverages each type of feature ***,dynamic SLAM can provide more robust localization for intelligent robots that operate in complex dynamic ***,to meet the demands of some high-level tasks,dynamic SLAM can be integrated with multiple object *** article presents a survey on dynamic SLAM from the perspective of feature choices.A discussion of the advantages and disadvantages of different visual features is provided in this article.

关键词： Dynamic simultaneous localization and mapping Multiple objects tracking Data association Object simultaneous localization and mapping Feature choices

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Image-based camera localization: an overview

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Visual Computing for Industry,Biomedicine,and Art 2018年第1期1卷 82-94页

作者： yihong wu Fulin Tang Heping Li National Laboratory of Pattern Recognition Institute of AutomationChinese Academy of SciencesBeijingChinaUniversity of Chinese Academy of SciencesBeijingChina

Virtual reality,augmented reality,robotics,and autonomous driving,have recently attracted much attention from both academic and industrial communities,in which image-based camera localization is a key ***,there has not been a complete review on image-based camera *** is urgent to map this topic to enable individuals enter the field *** this paper,an overview of image-based camera localization is presented.A new and complete classification of image-based camera localization approaches is provided and the related techniques are *** for future development are also *** will be useful not only to researchers,but also to engineers and other individuals interested in this field.

关键词： PnP problem SLAM Camera localization Camera pose determination

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Maintaining the connected river-lake relationship in the middle Yangtze River reaches after completion of the Three Gorges Project

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International Journal of Sediment Research 2017年第4期32卷 487-494页

作者： Xiuying Wang Xiang Li Baiyinbaoligao yihong wu State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower Research

After operation of the Three Gorges Project(TGP), there is a new evolution tendency for rivers and lakes in the middle reaches of the Yangtze River(i.e. the Ching River reaches). In recent years, the weakening connection relationship between the Yangtze River and Dongting Lake has resulted in a series of problems for flood regulation, water resources utilization, and aquatic ecosystem protection in the river-lake joint area. In this paper, the hydrological characteristics and fluvial processes within the river-lake joint area are studied, and possible management strategies to maintain the connected river-lake relationship are proposed. To achieve this objective, the evolution tendency, such as the zero-flow problem and river regime for three major outlets(i.e. the Songzi Outlet, Taiping Outlet, and Ouchi Outlet) to Dongting Lake from the Yangtze River, is analyzed. It is believed that the Songzi Outlet has a comparative advantage in flow diversion over the other two outlets. The Range of Variability Approach is introduced to identify hydrological characteristics at the Songzi Outlet. Several characteristic values of flow diversion from this outlet during drought periods are determined. Then, the fluvial processes in the river-lake joint area are studied by comparing topographic maps and using control gauge station data of various years. The water and sediment flux are analyzed before and after operation of the TGP. Finally, based on the results obtained, two possible management strategies are recommended and corresponding parameters are estimated to strengthen and maintain the connected river-lake relationship. This analysis takes into account operation of the TGP, mainstream shift and increasing riverbed scour in the Ching River *** restore the flow diversion condition to that in the 1950 s or 1960 s(i.e. 140 m~3/s of flow diversion corresponding to 5500 m~3/s of flow at the Zhicheng station), it is estimated that the river channel around the Songzi Outlet s

关键词： River-lake relationship Yangtze River Dongting Lake Three Gorges Project Flow diversion

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Commutators of Littlewood-Paley Operators on Herz Spaces with Variable Exponent

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Analysis in Theory and Applications 2016年第2期32卷 149-163页

作者： Hongbin Wang yihong wu School of Science Shandong University of Technology Zibo Shandong 255049China Department of Recruitment and Employment Zibo Normal College ZiboShandong 255130 China

Let Ω ∈ L^2（S^n-1） be homogeneous function of degree zero and b be BMO functions. In this paper, we obtain some boundedness of the Littlewood-Paley Opera- tors and their higher-order commutators on Herz spaces wit... 详细信息

关键词： Herz space variable exponent commutator area integral Littlewood-Paley gλ* func-t-ion.

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Transport of a volatile contaminant in a free-surface wetland flow

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Frontiers of Earth Science 2014年第1期8卷 115-122页

作者： Jue YUAN Li ZENG Yijun ZHAO yihong wu Ping JI Bin CHEN State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower Research Beijing 100038 China State Key Laboratory of Water Environment Simulation Schoolof Environment Beijing Normal University Beijing 100875 China

Presented in this paper is an analytical study of a pulsed volatile contaminant emission into a free-surface wetland flow. A simplified model is given for contaminant transport under the combined action of advection, mass dispersion, apparent reaction, and volatilization at the free water surface. The effect of periodic apparent reaction on contaminant transport is separated from the hydraulic effect via an extended transformation, with a limiting case covering the known transformation for constant apparent reaction rate. The analytical solutions of zeroth and first order concentration moments are rigorously derived and illustrated. It was found that the amount of contaminant decreases from the bottom bed to the free-surface under volatilization, and the total amount of contaminant decays with time. It was also found that the moving speed of the mass center of the whole contaminant cloud increases, as the ratio of volatilization coefficient to vertical effective mass dispersivity increases.

关键词： contaminant transport volatilization reaction wetland hydraulics

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Search for carbon stars and DZ white dwarfs in SDSS spectra survey through machine learning

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Science China(Physics,Mechanics & Astronomy) 2014年第1期57卷 176-186页

作者： SI JianMin LUO ALi LI YinBi ZHANG JianNan WEI Peng wu yihong wu FuChao ZHAO YongHeng National Laboratory of Pattern Recognition Institute of Automation Chinese Academy of Sciences Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences University of Chinese Academy of Sciences

Carbon stars and DZ white dwarfs are two types of rare objects in the Galaxy. In this paper, we have applied the label propagation algorithm to search for these two types of stars from Data Release Eight （DR8） of the Sloan Digital Sky Survey （SDSS）, which is verified to be efficient by calculating precision and recall. From nearly two million spectra including stars, galaxies and QSOs, we have found 260 new carbon stars in which 96 stars have been identified as dwarfs and 7 identified as giants, and 11 composition spectrum systems （each of them consists of a white dwarf and a carbon star）. Similarly, using the label propagation method, we have obtained 29 new DZ white dwarfs from SDSS DR8. Compared with PCA reconstructed spectra, the 29 findings are typical DZ white dwarfs. We have also investigated their proper motions by comparing them with proper motion distribution of 9,374 white dwarfs, and fotmd that they satisfy the current observed white dwarfs by SDSS generally have large proper motions. In addition, we have estimated their effective temperatures by fitting the polynomial relationship between effective temperature and g-r color of known DZ white dwarfs, and found 12 of the 29 new DZ white dwarfs are cool, in which nine are between 6,000 K and 6,600 K, and three are below 6,000 K.

关键词： machine learning label propagation carbon stars DZ white dwarfs

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The“Islamic Cultural Exception”of GCC Countries

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Asian Journal of Middle Eastern and Islamic Studies 2015年第1期9卷 54-77,I0003页

作者： QIAN Xuewen wu yihong Middle East Studies Institute Shanghai International Studies University Xinhua Center for World Affairs Studies

The“Cultural exception”policy formulated by a country is to protect its culture not to be invaded by *** is one of the most important economies in the Middle East,and the“Islamic cultural exception”is the principled position which the GCC countries adhere to in the WTO or FTA *** 20 years,the FTA negotiations between the EU and the GCC countries have been unsuccessful,and in 10 years the ones between the US and the GCC have experienced the same *** the WTO negotiations,the GCC countries can make some concessions and cooperate *** FTA negotiations between China and GCC have also been carried out for 10 *** the beginning of this year,the departments of Chinese Ministry of Foreign Affairs and senior officials have made unrelenting diplomatic efforts to promote the resumption of the FTA negotiations with the *** with China’s“One Belt and One Road”strategy,China had better launch a more flexible policy of economic and trade cooperation to cope with the GCC countries’“Islamic cultural exception”.The“One Belt and One Road”strategy has special significance to China’s economic development in the future.

关键词： “Cultural Exception” GCC Countries Islam FTA Negotiations between China and GCC

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Assessment of the Spatial and Temporal Water Eutrophication for Lake Baiyangdian Based on Integrated Fuzzy Method

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Journal of Environmental Protection 2013年第1期4卷 120-125页

作者： Shuxuan Liang Hong wu Hongbo Li yihong wu College of Chemistry and Environmental Science Hebei University Baoding China Hebei Provincial Academy of Environmental Science Shijiazhuan China

Water quality evaluation entails both randomness and fuzziness. Considering that water eutrophication evaluation involves many indices, different classifications and interval values, fuzzy variable sets theory was developed to Lake Baiyangdian as a study case. Taking reference to eutrophication standard of Chinese lakes and local characteristic of Lake Baiyangdian, eutrophication degree of lake was divided into 8 levels. Total phosphorus, total nitrogen, and CODMn were selected as evaluation indices in this research. Based on the measured data, index feature value matrix of sample was built. Index weights were determined by means of pure threshold value method. Relative membership degree of each index to each classification was calculated with relative difference function model. Then the stability of feature value of classification corresponding was received by the comprehensive calculation with the relative membership degree and index weights. The results show that the proposed models are effective tools for generating a set of realistic and flexible optimal solutions for complicated water quality evaluation issues. It concluded that the model was reasonable and practical.

关键词： Eutrophication Evaluation Fuzzy Method Spatial Variation Temporal Variation Lake Baiyangdian

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