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基于隐式表达的服装三维重建

计算机工程 2024年第5期50卷 220-228页

作者：费煜哲蔡欣赵鸣博杨圣豪东华大学信息科学与技术学院上海201620

随着近年来互联网购物的快速发展,在各大平台上出现了越来越多的服装商品。通过三维重建技术生成服装的三维模型可以帮助消费者更好地了解服装的姿态信息。针对服装的三维重建技术进行研究,提出基于隐式表达的服装三维重建模型。使用神... 详细信息

随着近年来互联网购物的快速发展,在各大平台上出现了越来越多的服装商品。通过三维重建技术生成服装的三维模型可以帮助消费者更好地了解服装的姿态信息。针对服装的三维重建技术进行研究,提出基于隐式表达的服装三维重建模型。使用神经网络学习获得的占用函数作为服装三维模型的隐式表达,从而建立三维坐标和模型形状的映射。目前已有的三维重建算法需要拟合复杂的曲面模型,但资源消耗量大,而基于隐式表达的三维重建算法不需要进行参数化和网格化,能够提高算法的运行速度。为了进一步提高三维重建效果,采用目前性能最好的Point MetaBase-L网络模型和偏移注意力模块作为模型的特征提取网络。其中Point MetaBase-L网络模型基于现有的点云特征提取网络提出Set Abstraction层的元架构Point Meta,并通过分析选择Point Meta元架构中4个模块的最佳实践构成Point MetaBase-L网络模型的Set Abstraction层,同时引入平面特征投影模块加强特征的局部信息。在特征解码阶段,利用特征权重网络通过加权平均算法获取三维空间中采样点的占用概率。根据这些采样点的占用概率,通过基于区域增长的Marching Cubes算法提取高精度网格重建模型。实验结果表明,与占用网络相比,改进模型在交并比、倒角距离、法线一致性和F1值上分别提升了48.83%,55.17%、4.27%和79.10%。

关键词：隐式表达三维重建 Point Meta Base-L网络模型偏移注意力特征权重网络区域增长 Marching Cubes算法

Plastic-elastic Model for Water-based Lubrication Considering Surface Force

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Chinese Journal of Mechanical Engineering 2022年第5期35卷 208-218页

作者： Shuowen Zhang mingbo zhao Chenhui Zhang State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Water-based lubrication is an effective method to achieve superlubricity,which implies a friction coefficient in the order of 10−3 or *** numerical,analytical,and experimental studies confirm that the surface force effect is crucial for realizing water-based *** enhance the contribution of the surface force,soft and plastic materials can be utilized as friction pair materials because of their effect in increasing the contact area.A new numerical model of water-based lubrication that considers the surface force between plastic and elastic materials is developed in this study to investigate the effect of plastic flow in water-based *** the complexity of residual stress accumulation in lubrication problems,a simplified plastic model is proposed,which merely calculates the result of the dry contact solution and avoids repeated calculations of the plastic *** results of the two models show good *** deformation reduces the local contact pressure and enhances the function of the surface force,thus resulting in a lower friction coefficient.

关键词： Numerical model Water-based lubrication Mixed lubrication Plastic model Superlubricity

Multi-view ladar data registration in obscure environment

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Journal of Systems Engineering and Electronics 2013年第4期24卷 606-616页

作者： mingbo zhao Jun He Wei Qiu Qiang Fu Science and Technology Automatic Target Recognition Laboratory National University of Defense Technology Unit 93246 of the PLA

Multi-view laser radar （ladar） data registration in obscure environments is an important research field of obscured target detection from air to ground. There are few overlap regions of the observational data in different views because of the occluder, so the multi-view data registration is rather difficult. Through indepth analyses of the typical methods and problems, it is obtained that the sequence registration is more appropriate, but needs to improve the registration accuracy. On this basis, a multi-view data registration algorithm based on aggregating the adjacent frames, which are already registered, is proposed. It increases the overlap region between the pending registration frames by aggregation and further improves the registration accuracy. The experiment results show that the proposed algorithm can effectively register the multi-view ladar data in the obscure environment, and it also has a greater robustness and a higher registration accuracy compared with the sequence registration under the condition of equivalent operating efficiency.

关键词： laser radar (ladar) multi-view data registration iterative closest point obscured target point cloud data.

Range anomaly suppression based on neighborhood pixels detection in ladar range images

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Journal of Systems Engineering and Electronics 2013年第1期24卷 68-75页

作者： mingbo zhao Jun He Zaiqi Lu Qiang Fu Automatic Target Recognition Key Laboratory School of Electronic Science and EngineeringNational University of Defense Technology No.93246 Troop of the PLA

Research on the range anomaly suppression algorithm in laser radar （ladar） range images is significant in the application and development of ladar. But most of existing algorithms cannot protect the edge and linear target well while suppressing the range anomaly. Aiming at this problem, the differences among the edge, linear target, and range anomaly are analyzed and a novel algo- rithm based on neighborhood pixels detection is proposed. Firstly, the range differences between current pixel and its neighborhood pixels are calculated. Then, the number of neighborhood pixels is detected by the range difference threshold. Finally, whether the current pixel is a range anomaly is distinguished by the neighbor- hood pixel number threshold. Experimental results show that the new algorithm not only has a better range anomaly suppression performance and higher efficiency, but also protects the edge and linear target preferably compared with other algorithms.

关键词： image processing range anomaly suppression neigh-borhood p xe s detection linear target laser radar (ladar).

Four new phenolic glycosides from Baoyuan decoction

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Acta Pharmaceutica Sinica B 2017年第2期7卷 173-178页

作者： Xiaoli Ma Xiaoyu Guo mingbo zhao Pengfei Tu Yong Jiang State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical SciencesPeking UniversityBeijing 100191China

Four new phenolic glycosides,including two flavonoid glycosides(1 and 2) and two lignan glycosides(3 and 4),were isolated from the traditional Chinese medicine formula,Baoyuan *** structures were established by detailed analysis of the NMR and HR-ESI-MS spectroscopic data and their absolute configurations were determined by the experimental electronic circular dichroism data as well as chemical ***,the sources of the four new compounds were determined by the UPLC-Qtrap-MS method,which proved that 1 and 2 are originated from Glycyrrhiza uralensis,and 3 and4 are from Cinnamomum cassia.

关键词： Baoyuan decoction Traditional Chinese med icine formula Flavonoid glycosides Lignan glycosides Electronic circular dichroism UPLC–Qtrap-MS

Network coding based all-optical multicast in WDM networks

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The Journal of China Universities of Posts and Telecommunications 2015年第1期22卷 89-94页

作者： Qu Zhijian Zhang Xianwei Shi Shaojian Cao Yanfeng zhao mingbo School of Computer Science and Technology Shandong University of Technology

Wavelength division multiplexing （WDM） has been becoming a promising solution to meet the rapidly growing demands on bandwidth. Multicast in WDM networks by employing free wavelength is an efficient approach to saving bandwidth and cost. However, the free wavelength may not identical between different hops in a multicast light-path, particularly in heavy load optical WDM networks. In order to implement multicast applications efficiently, a network coding （NC） technique was introduced into all-optical WDM multicast networks to solve wavelength collision problem between the multicast request and the unicast request. Compared with the wavelength conversion based optical multicast, the network coding based optical multicast can achieve better multicast performance with paying lower cost.

关键词： NC all-optical multicast WDM networks wavelength conversion

Clothes Keypoints Detection with Cascaded Pyramid Network

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Journal of Donghua University(English Edition) 2020年第3期37卷 232-237页

作者： LI Chao zhao mingbo College of Information Science and Technology Donghua UniversityShanghai 201620China

With the development of the society,people's requirements for clothing matching are constantly increasing when developing clothing recommendation *** requires that the algorithm for understanding the clothing images should be sufficiently efficient and ***,we detect the keypoints in clothing accurately to capture the details of clothing *** the joint points of the garment are similar to those of the human body,this paper utilizes a kind of deep neural network called cascaded pyramid network(CPN)about estimating the posture of human body to solve the problem of keypoints detection in *** this paper,we first introduce the structure and characteristic of this neural network when detecting *** we evaluate the results of the experiments and verify effectiveness of detecting keypoints of clothing with CPN,with normalized error about 5%7%.Finally,we analyze the influence of different backbones when detecting keypoints in this network.

关键词： deep learning keypoints estimation convolutional neural network

Seismic and vibration control of segmented isolation layer in underground structure-diaphragm wall system

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Underground Space 2024年第6期19卷 72-86页

作者： Zhidong Gao mingbo Li Mi zhao Xiuli Du Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of TechnologyBeijing 100124China Department of Hydraulic Engineering Tsinghua UniversityBeijing 100084China

In this paper,a seismic and vibration reduction measure of subway station is developed by setting a segmented isolation layer between the sidewall of structure and the diaphragm *** segmented isolation layer consists of a rigid layer and a flexible *** rigid layer is installed at the joint section between the structural sidewall and slab,and the flexible layer is installed at the remaining sections.A diaphragm wall-segmented isolation layer-subway station structure system is *** and vibration control performance of the diaphragm wall-segmented isolation layer-subway station structure system is evaluated by the detailed numerical ***,a three-dimensional nonlinear time-history analysis is carried out to study the seismic response of the station structure by considering the effect of different earthquake motions and stiffness of segmented isolation ***,the vibration response of site under training loading is also studied by considering the influence of different train velocities and stiffness of the segmented isolation *** results demonstrate that the diaphragm wall-segmented isolation layer-subway station structure system can not only effectively reduce the lateral deformation of station structure,but also reduce the tensile damage of the roof *** the other hand,the developed reduction measure can also significantly reduce the vertical peak displacements of site under training loading.

关键词： Subway station Diaphragm wall Segmented isolation layer Seismic response Train vibration

The Design of A/D Converter Circuit Adopting the Technology of PWM

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微计算机信息 2007年第29期23卷 272-274页

作者： Chen Ping Li Jing zhao mingbo School of Computer Science and Technology Shandong University of Technology Zibo China255049

This text has expounded the working principle of realizing A/D conversion that utilizes the timer within MCU and combinesthe technology of PWM. The design of hardware circuit, improved gradual approached trial arithmetic and relevant program design arediscussed in detail. And it has analyzed the resolution of A/D converter based on the technology of PWM, etc.

关键词： PWM A/D 转换分辨率改进逐次逼近试探算法比较器电路设计