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Multi-person vision tracking approach based on human body localization features

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Advances in Manufacturing 2021年第4期9卷 496-508页

作者： Ao-Lei Yang Hai-Yan ren Min-Rui fei Wasif Naeem School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444People’s Republic of China School of Electronics Electrical Engineering and Computer ScienceQueen’s University BelfastBelfast BT71NNNorthern IrelandUK

This paper presents a multi-person vision tracking approach based on human body localization features to address the problem of interactive object localization and tracking in a home monitoring ***,the human body localization model is used to obtain the 3D position of the human body,which is then used to construct the human body motion model based on the Kalman filter *** the same time,the human appearance model is constructed by fusing human color features and features of the histogram of oriented gradient to better characterize the human ***,the human body observation model is constructed based on the human body motion model and appearance model to measure the similarities between the human body state sequence in the historical frame and the human body observation result in the current frame,and the cost matrix is then ***,the Hungarian maximum matching algorithm is employed to match each human body in the current and historical frames,and the exception detection mechanism is simultaneously constructed to further reduce the probability of human tracking and matching ***,a multi-person vision tracking verification platform was constructed,and the achieved average accuracy was 96.6%in the case of human body overlapping,occlusion,disappearance,and appearance;this verifies the feasibility and effectiveness of the proposed method.

关键词： Multi-person vision tracking Human body positioning Motion model Body observation model

Hierarchical-Based Object Detection with Improved Locality Sparse Coding

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Chinese Journal of Electronics 2016年第2期25卷 290-295页

作者： zhu Suguo DU Junping ren Nan LIANG Meiyu Beijing Key Laboratory of Intelligent Telecommunication software and Multimedia School of Computer ScienceBeijing University of Posts and Telecommunications

This paper proposes to extend the hierarchical method to be adapted to sequential frames, aiming at detecting the moving object in dynamic scenes. A novel two-layer model is proposed, in which dictionaries are learned through three different stages and the locality constrained sparse representation is improved. This leads more significant improvement for performance of both static image classification and moving object detection. The experimental results demonstrate that the proposed algorithm is efficient and robust compared with the state-of-the-art classification methods, and also able to detect moving object in the sequential frames accurately.

关键词： Hierarchical detection Sparse coding Classification Object detection

Artificial intelligence in computer-aided diagnosis of abdomen diseases

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Science China(Life Sciences) 2019年第10期62卷 1396-1399页

作者： fei Gao Yi zhu Jue Zhang College of Engineering Peking UniversityBeijing 100871China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China

The abdomen contains many organs, along with a range of abdominal diseases that require accurate diagnosis. Clinical imaging plays a crucial role in abdominal disease diagnosis, prognosis, and treatment assessment. For decades, physicists have focused on innovation in terms of imaging techniques, assisting radiologists to improve abdominal diseases detection and diagnosis. Consequently, many new imaging methods for abdominal organs have been developed, including computed tomography (CT), magnetic resonance imaging (MRI), positron emission tomography (PET), X-ray, endoscopy, and ultrasound (McAuliffe et al., 2001;Dhawan et al., 2011). Each imaging method has its own unique features. For example, abdominal MRI can achieve the most comprehensive assessment of abdominal lesions, such as the liver, kidney and prostate (Yang et al., 2017;Wang et al., 2018;Gao et al., 2017) mainly due to its diversiform sequences, including structural imaging such as T1 weighted imaging and T2 weighted imaging, as well as diffusion imaging, perfusion imaging, arterial spin labeling and other functional imaging that reflect different functional changes.

关键词： computed tomography magnetic resonance imaging positron emission tomography

Comprehensive Reliability Allocation Method for CNC Lathes Based on Cubic Transformed Functions of Failure Mode and Effects Analysis

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Chinese Journal of Mechanical Engineering 2015年第2期28卷 315-324页

作者： YANG Zhou zhu Yunpeng ren Hongrui ZHANG Yimin School of Mechanical Engineering & Automation Northeastern University

Reliability allocation of computerized numerical controlled（CNC）lathes is very important in *** allocation methods only focus on high-failure rate components rather than moderate failure rate components,which is not applicable in some *** at solving the problem of CNC lathes reliability allocating,a comprehensive reliability allocation method based on cubic transformed functions of failure modes and effects analysis（FMEA）is ***,conventional reliability allocation methods are *** the limitations of direct combination of comprehensive allocation method with the exponential transformed FMEA method are ***,a cubic transformed function is established in order to overcome these *** of the new transformed functions are discussed by considering the failure severity and the failure *** can choose appropriate transform amplitudes according to their ***,a CNC lathe and a spindle system are used as an example to verify the new allocation *** criteria are considered to compare the results of the new method with traditional *** allocation results indicate that the new method is more flexible than traditional *** employing the new cubic transformed function,the method covers a wider range of problems in CNC reliability allocation without losing the advantages of traditional methods.

关键词： CNC lathes reliability failure modes and effects analysis(FMEA) cubic transformed function comprehensive allocation

Arsenic prepared by Chinese alchemist-pharmacists

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Science China(Life Sciences) 2016年第10期59卷 1086-1089页

作者： Jing zhu Dingcheng ren Department of Philosophy East China Normal UniversityShanghai 200241China Department of History University of Chinese Academy of SciencesBeijing 100049China Center for Social Studies of Science Peking UniversityBeijing 100871China

Dear Editor, The discovery of artemisinin is just one of the gifts from traditional Chinese medicine to the world. Clinical studies have shown that arsenic trioxide, an ancient drug used in Chinese medicine, is an effective and relatively safe treat- ment for acute promyelocytic leukemia （APL）. In particular, Chinese alchemy has attracted attention as it gave rise to a wealth of innovations in the medical and chemical field,

关键词：三氧化二砷中国急性早幼粒细胞白血病炼丹术化学领域中医药青蒿素 APL

Optimizing the cleanliness in multi-segment disk amplifiers based on vector flow schemes

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High Power Laser Science and Engineering 2018年第1期6卷 1-6页

作者： Zhiyuan ren Jianqiang zhu Zhigang Liu Xiaowei Yang Key Laboratory on High Power Laser and Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800 China

The objective of maintaining the cleanliness of the multi-segment disk amplifier in Shenguang-II(SG-II) is to reduce laser-induced damage for optics. The flow field of clean gas, which is used for the transportation of contaminant particles,is a key factor affecting the cleanliness level in the multi-segment disk amplifier. We developed a gas–solid coupling and three-dimensional flow numerical simulation model. The three-dimensional and two-phase flow model is verified by the flow-field smog experiment and the particle concentration measurement experiment with the 130-disk amplifier in SG-II. By optimizing the boundary conditions with the same flow rate, the multi-inlet vector flow scheme can not only effectively reduce the purging time, but also prevent the reverse diffusion of contaminant particles in the multi-segment disk amplifier and the deposition of contaminant particles on the surface of the Nd:glass.

关键词： cleanliness computational fluid dynamics flow field multi-segment disk amplifier vector flow

Numerical Modeling of Local Scour Around Hydraulic Structure in Sandy Beds by Dynamic Mesh Method

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Journal of Ocean University of China 2017年第5期16卷 738-746页

作者： FAN fei LIANG Bingchen BAI Yuchuan zhu Zhixia zhu Yanjun State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Tianjin 300000 P. R. China Shandong Province Key Laboratory of Ocean Engineering Ocean University of China Qingdao 266100 P. R. China Jiangsu Province Water Transport Engineering Technology Research Center Nanjing 21000 P. R. China

Local scour, a non-negligible factor in hydraulic engineering, endangers the safety of hydraulic structures. In this work, a numerical model for simulating local scour was constructed, based on the open source code computational fluid dynamics model Open FOAM. We consider both the bedload and suspended load sediment transport in the scour model and adopt the dynamic mesh method to simulate the evolution of the bed elevation. We use the finite area method to project data between the three-dimensional flow model and the two-dimensional(2D) scour model. We also improved the 2D sand slide method and added it to the scour model to correct the bed bathymetry when the bed slope angle exceeds the angle of repose. Moreover, to validate our scour model, we conducted and compared the results of three experiments with those of the developed model. The validation results show that our developed model can reliably simulate local scour.

关键词： suspended validate adopt slide correct negligible hydraulic elevation turbulence projection

3-D Free-form Shape Measuring System Using Unconstrained Range Sensor

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Chinese Journal of Mechanical Engineering 2011年第6期24卷 1095-1102页

作者： ren Tongqun zhu Jigui GUO Yingbiao KE Xiaolong Key Laboratory for Micro/Nano Technology and System ofLiao Ning Province Dalian University of Technology Dalian 116023 China State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University Tianjin 300072 China Department of Mechanical and Electrical Engineering Xiamen University Xiamen 361005 China

Three-dimensional（3-D） free-form shape measurement,a challenging task pursued by computer vision,is mainly characterized with single view acquisition and multiple view *** of the conventional scanning systems are less flexibility and difficult to realize engineering applications for employing sequential registration *** develop portable scanning system and engineering registration method overcoming problems of error accumulation and propagation is the research *** this paper,one 3-D free-form shape measuring system using unconstrained range sensor is designed.A quasi-active stereo binocular visual sensor embedded within a scanning mechanism is used as the range *** compensation is performed by residual amendment according to camera calibration *** control points are designed and adhered on object and one camera is introduced to shot these control points from different positions and *** ray bundle adjustment（BA） method is used to calculate the space coordinates of all the control points,so as to set up a global control net *** can be completed by mapping at least 3 control points observed by range sensor in single view acquisition into the global control *** this system,no calibration for laser plane is required and the motion of range sensor is completely *** overlapping of neighboring region is unessential for ***,the working range of the system can be easily *** measuring precision mainly depends on the quality of global control *** sequential distances of coding control points are observed by electronic theodolites and then compared with those obtained according to BA *** results show that relative distance error of control points is no more than 0.2%.The proposed measuring system is portable,provides good capacity for global error control,and contributes to the engineering application of 3-D free-form shape measurement.

关键词： shape measurement multiple view registration bundle adjustment global control network

The Rossby wave train patterns forced by shallower and deeper Tibetan Plateau atmospheric heat-source in summer in a linear baroclinic model

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Atmospheric and Oceanic Science Letters 2019年第1期12卷 35-40页

作者： zhu Chuandong ren Rongcai State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences College of Earth and Planetary Sciences University of Chinese Academy of Sciences Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters and KLME Nanjing University of Information Science and Technology

By using a linear baroclinic model(LBM),this study investigates the different Rossby wave train(RWT)patterns associated with the Tibetan Plateau(TP)upper-atmospheric heat source(TPUHS)that is anomalously shallower and deeper in boreal *** results indicate the different RWT patterns between the developing and decaying periods of synoptic TPUHS events,when the anomalous TPUHS develops from a relatively shallower to a deeper TP heat *** on the different vertical heating profiles between these two periods in observation,this study forces the LBM with prescribed TPUHS profiles to mimic a shallower and deeper summer TP heat *** results show that the atmospheric responses to a shallower and deeper TPUHS do exhibit different RWT patterns that largely resemble those in ***,corresponding RWT pattern to a shallower TPUHS stretches from the TP to the west coast of America,while that to a deeper TPUHS extends from the TP region to Alaska.

关键词： Tibetan Plateau upper atmospheric heat source shallower and deeper heat source Rossby wave train pattern