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17th Asian Conference on Computer Vision, ACCV 2024

作者： Jiao, Siyi Zeng, Wenzheng Gao, Changxin Sang, Nong Key Laboratory of Image Processing and Intelligent Control School of Artificial Intelligence and Automation Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9789819609710

Interactive portrait matting refers to extracting the soft portrait from a given image that best meets the user’s intent through their inputs. Existing methods often underperform in complex scenarios, mainly due to three factors. (1) Most works apply a tightly coupled network that directly predicts matting results, lacking interpretability and resulting in inadequate modeling. (2) Existing works are limited to a single type of user input, which is ineffective for intention understanding and also inefficient for user operation. (3) The multi-round characteristics have been under-explored, which is crucial for user interaction. To alleviate these limitations, we propose DFIMat, a decoupled framework that enables flexible interactive matting. Specifically, we first decouple the task into 2 sub-ones: localizing target instances by understanding scene semantics and the flexible user inputs, and conducting refinement for instance-level matting. We observe a clear performance gain from decoupling, as it makes sub-tasks easier to learn, and the flexible multi-type input further enhances both effectiveness and efficiency. DFIMat also considers the multi-round interaction property, where a contrastive reasoning module is designed to enhance cross-round refinement. Another limitation for multi-person matting task is the lack of training data. We address this by introducing a new synthetic data generation pipeline that can generate much more realistic samples than previous arts. A new large-scale dataset SMPMat is subsequently established. Experiments verify the significant superiority of DFIMat. With it, we also investigate the roles of different input types, providing valuable principles for users. Our code and dataset will be public. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Large datasets

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A Frequency Swept Interferometer (FIS) Based Sensing System for Mega Satellite Constellation 7

A Frequency Swept Interferometer (FIS) Based Sensing System ...

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7th International Conference on Aeronautical, aerospace and Mechanical Engineering, AAME 2024

作者： Jiang, Yifei Chao, Zhong He, Wanxie Bei, Wan Wu, Shufan Mo, Qiankun School of Aeronautics and Astronautics Shanghai Jiao Tong University Shanghai China Institute of Shanghai Aerospace Control Technology Shanghai201101 China Institute of Shanghai Aerospace Computer Technology Shanghai201101 China Shanghai Key Laboratory of Space Intelligent Control Technology China

As the novel research of space technologies, non-terrestrial-network (NTN) is one of the most important technologies. Mega satellite constellation is the baseline of the NTN technologies. Unfortunately, as the density of satellite deployment, the risk of collisions between satellites also increases significantly. Therefore, sensing technology is an important solution to avoid collisions within constellation. In this article, a sensing system for satellite constellation is proposed. It contains multiple subsystems working together to ensure measurement accuracy. An accurate laser measurement based on frequency swept interferometer (FIS) is the core of the sensing technologies. With a sensing distance of a few hundred meters, the specific FSI system can realize microns meterss accuracy in many experiments. Those results guarantee the well performance of the sensing system. © Published under licence by IOP Publishing Ltd.

关键词： Interferometers

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Energy dissipation mechanism and ballistic characteristic optimization in foam sandwich panels against spherical projectile impact

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Defence technology（防务技术） 2024年第5期35卷 108-122页

作者： Jianqiang Deng Tao Liu Liming Chen Xin Pan Jingzhe Wang Shaowei Zhu Weiguo Li College of Aerospace Engineering Chongqing UniversityChongqing 400030China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400030China Chongqing Key Laboratory of Heterogeneous Material Mechanics Chongqing UniversityChongqing 400030China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

This study systematically examines the energy dissipation mechanisms and ballistic characteristics of foam sandwich panels(FSP)under high-velocity impact using the explicit non-linear finite element *** on the geometric topology of the FSP system,three FSP configurations with the same areal density are derived,namely multi-layer,gradient core and asymmetric face sheet,and three key structural parameters are identified:core thickness(t_(c)),face sheet thickness(t_(f))and overlap face/core number(n_(o)).The ballistic performance of the FSP system is comprehensively evaluated in terms of the ballistic limit velocity(BLV),deformation modes,energy dissipation mechanism,and specific penetration energy(SPE).The results show that the FSP system exhibits a significant configuration dependence,whose ballistic performance ranking is:asymmetric face sheet>gradient core>*** mass distribution of the top and bottom face sheets plays a critical role in the ballistic resistance of the FSP *** BLV and SPE increase with tf,while the raising tcor noleads to an increase in BLV but a decrease in ***,a face-core synchronous enhancement mechanism is discovered by the energy dissipation analysis,based on which the ballistic optimization procedure is also conducted and a design chart is *** study shed light on the anti-penetration mechanism of the FSP system and might provide a theoretical basis for its engineering application.

关键词： Sandwich panel Numerical simulation Ballistic resistance Specific penetration energy Energy analysis

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A WE-OSELM Online Prediction Algorithm to Engine control 3

A WE-OSELM Online Prediction Algorithm to Engine Control

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3rd International Conference on Computing, Communication, Perception and Quantum technology, CCPQT 2024

作者： Gao, Jie Wang, Xin Zhang, Ying Quality Manage Department Beijing Aerospace Automatic Control Institute Beijing China Project Command Office International Business Department China Academy of Launch Vehicle Beijing China National Key Laboratory of Science and Technology on Aerospace Intelligent Beijing Aerospace Automatic Control Institute Peking University Beijing China

ISBN: (纸本)9798331528386

Based on the time series online prediction model, this paper proposes a WE-OSELM online prediction algorithm, which can control the product life and performance in real time in the field of engine, and effectively manage huge system engineering. The prediction model is closely related to the actual application of system engineering product modules and has great operability. This paper proposes the IPW-OSELM algorithm and error compensation algorithm with information perception weight as the core point, and relies on a dual parallel single hidden layer feedforward neural network to efficiently integrate related algorithms to form a WE-OSLEM algorithm. Among them, the information perception weight clarifies the relationship between point similarity and regional similarity in the case of fluctuations in the effectiveness of the data characteristics of the prediction object or mutations in a limited range, so that the online prediction algorithm has a more acute data characteristic perception ability in the process of responding to changes in data characteristics. © 2024 IEEE.

关键词： Prediction models

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Adaptive Trap-Based Noise Suppression Interference Suppression Algorithm

Adaptive Trap-Based Noise Suppression Interference Suppressi...

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2023 China Automation Congress, CAC 2023

作者： He, Shaoqi Xiao, Liangang Sun, Peng Beijing Aerospace Automatic Control Institute National KeyLaboratory and Technology on Aerospace Intelligence Control Beijing China Beijing Aerospace Automatic Control Institute Committee of Science and Technologyational Key Laboratory of Science and Technology on Aerospace Beijing China Beijing Aerospace Automatic Control Institute Guidance and Detection Division Beijing China

ISBN: (纸本)9798350303759

Aiming at the problem of poor anti-noise interference ability of linear FM fuzes, the noise FM interference suppression method based on adaptive trap is proposed, and the adaptive trap is applied to linear FM fuzes for the single-frequency characteristics of linear FM fuzes generated by the frequency-checking signals. By adaptively adjusting the weights of the trap, the trap has a trapping characteristic at the frequency Dian of the differential frequency signal, so as to achieve the effect of noise FM interference suppression, and experiments show that the algorithm can recover the target echo signal when the interference signal is stronger than the target echo by 10 dB. © 2023 IEEE.

关键词： Frequency modulation

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Real-time Data Feature for Health Based on State Change Rate 3

Real-time Data Feature for Health Based on State Change Rate

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3rd International Conference on Computing, Communication, Perception and Quantum technology, CCPQT 2024

作者： Wen, Yudi Wang, Xin Zhang, Ying Quality Manage Department Beijing Aerospace Automatic Control Institute Beijing China Project Command Office International Business Department China Academy of Launch Vehicle Beijing China National Key Laboratory of Science and Technology on Aerospace Intelligent Beijing Aerospace Automatic Control Institute Peking University Beijing China

ISBN: (纸本)9798331528386

This paper uses PSLOC (Predictive Sliding Local Outlier Correction) to remove random fluctuations and noise interference. The time series prediction of the system's signals over a period of time is performed based on the least squares support vector machine (LSSVM). The adaptive state change rate is used to detect the prediction starting point. The system's full life cycle signal is divided into several windows, and the state change rate of the signal in each window is calculated. The threshold is determined by calculating the state change rate of the full life cycle signal. Compared with the traditional denoising and smoothing algorithm for non-time series, the algorithm used is more suitable for outlier detection of time series whose trends change over time. The method used in this paper is compared with the traditional wavelet packet threshold denoising method. It is found that the method used in this paper can retain the degradation information of the system to the maximum extent while removing outliers, and is more suitable for data preprocessing for remaining life prediction. The algorithm can not only remove the interference of random fluctuations on state division and remaining life prediction, but also preserve the complete degradation trend of the system adjusted over time. © 2024 IEEE.

关键词： Time series

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Multi-Level Robotic Pouring Using Offline Reinforcement Learning

Multi-Level Robotic Pouring Using Offline Reinforcement Lear...

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2024 IEEE International Conference on Robotics and Biomimetics, ROBIO 2024

作者： Zhang, Xiaoxiong Liu, Junwei Zhang, Wei School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen Key Laboratory of Control Theory and Intelligent Systems Shenzhen518055 China

ISBN: (纸本)9781665481090

This paper presents a novel learning-based method for a robotic manipulator to achieve liquid pouring across different liquid levels using only visual sensors. Previous works have relied on either online reinforcement learning or imitation learning, which are limited by sim-to-real gaps or data efficiency. In this paper, we propose to combine supervised learning and offline reinforcement learning, utilizing a human demonstration dataset containing only successful pouring at the highest level. Specifically, our approach employs supervised learning for a visual classifier, transforming the visual input into a categorical distribution over liquid levels. The offline reinforcement learning method is applied to a binary-conditioned control policy, which takes a binary signal and the robot's proprioception as inputs to determine the action. The binary signal indicates whether the desired liquid level has been reached based on the target liquid level. Through experiments, our method demonstrates superior effectiveness compared to a state-of-the-art imitation learning algorithm. Moreover, tests in unseen scenarios and multiple liquid level commands verify the generalization and transferability of our approach. © 2024 IEEE.

关键词： Self-supervised learning

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A Thruster Configuration Method for Spacecraft Six-Dimensional control 6

A Thruster Configuration Method for Spacecraft Six-Dimension...

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6th International Symposium on Autonomous Systems, ISAS 2023

作者： Wang, Min Xie, Yongchun Su, Yan National Key Laboratory of Science and Technology on Space Intelligent Control Beijing Institute of Control Engineering Beijing China

ISBN: (纸本)9798350316155

The configuration of spacecraft thrusters directly affects the realization of precise automatic control and propellant consumption. At present, the design of thruster configuration lacks of theoretical guidance. Spacecraft carrying out complex space missions such as rendezvous and docking are often equipped with too many thrusters. This paper proposed a theoretical design method of thruster configuration for six-dimensional position and attitude control missions. Firstly, the mathematical description of thruster configuration is introduced. Then, a general design method of thruster configuration for six-dimensional control task is proposed. Finally, simulation of relative position and attitude control of rendezvous and docking task is taken as an example to verify the correctness and validity of the above method. © 2023 IEEE.

关键词： Attitude control

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Dynamic Modelling of Satellite with High Inertia and High-speed Rotating Payload 3

Dynamic Modelling of Satellite with High Inertia and High-sp...

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3rd International Conference on control Theory and Applications, ICoCTA 2023

作者： Xu, Lijia Li, Guiming Hu, Yong Chen, Bin Beijing Institute of Control Engineering Beijing China Science and Technology on Space Intelligent Control Laboratory Beijing China

ISBN: (纸本)9781839539824

Consider a class of satellite with rotating payload that has high moment of inertia and high rotation speed. In general, the ideal condition of perfect symmetry cannot be satisfied for the rotating payload. It is recognized in this paper that the rotation of the payload will cause the change of the satellite's centre of mass. For this special type of satellite, a general form of dynamics has been established by complex modelling. Based on the mathematical model, the disturbance torques generated by the rotating payload are decomposed into six major categories and analysed in detail. Finally, the results of the analysis are directly verified by mathematical simulations. © The Institution of Engineering & technology 2023.

关键词： Satellites

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Polarization characteristics of infrared radiation of space object 8

Polarization characteristics of infrared radiation of space ...

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8th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Zhang, Hui Sun, Shuodong Du, Weifeng Song, Qingzheng Shi, Jinhua Gao, Wenjie Shanghai Aerospace Control Technology Institute Shanghai China Shanghai Key Laboratory of Aerospace Intelligent Control Technology Shanghai China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

The polarization of infrared radiation is an important characterization of the feature and state information of the space object's surface. Due to the different in materials, surface features and on-orbit states, the polarization provides a theoretical support for the detection and recognition of the space targets. Through the detecting the polarization, the dimension of the target information would be increased, and then the ability of detection and recognition to the target would be increased too, so the shortcomings of the traditional infrared detection would be compensated. In this paper, the overall polarization characteristics from the reflection and self-radiation of the object are studied, and a mathematical model of the infrared polarization characteristics is established based on the bidirectional reflectance distribution function. And the influence of the surface roughness, the viewing angle and the zenith angle of incidence is analyzed on the degree of polarization. The research in this paper may provide basic theoretical support for infrared polarization detection and identification of space objects. © 2022 SPIE

关键词： Infrared radiation

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