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7 results on '"Du, Pengfei"'

2. View-based underwater SLAM using a stereo camera

Author

Guanyu Wang, Danxiang Jing, Wang Jieying, Wang Xiaoding, Du Pengfei, Fengzhong Qu, and Jun Han

Subjects
Color image, business.industry, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Point cloud, Simultaneous localization and mapping, View based, Geography, Computer Science::Computer Vision and Pattern Recognition, Graph (abstract data type), Computer vision, Artificial intelligence, Underwater, business, Global optimization, Stereo camera
Abstract

This paper proposes an underwater visual simultaneous localization and mapping system using a stereo camera. In front-end, the image data is used to execute feature detection and matching. And the vehicle motion is estimated by the feature matching result. In back-end, a global optimization method represented by a graph, is used to eliminate the errors. The mapping result is in the from 3-D point cloud, which is established by the information from color image and depth image.

Published
2017

3. Three-dimensional reconstruction of underwater objects from side-scan sonar images

Author

Jun Han, Fengzhong Qu, Du Pengfei, Wang Jieying, Jiawang Chen, and Danxiang Jing

Subjects
Side-scan sonar, Geography, business.industry, Depth map, Shadow, Point cloud, Synthetic aperture sonar, Computer vision, Image processing, Artificial intelligence, Underwater, business, Sonar
Abstract

This paper describes a method to reconstruct the three-dimensional aspects of underwater objects using side-scan sonar images. The sonar images are segmented into three kinds of regions: echo, shadow and background. A two-dimensional intensity map is estimated from the echoes and a two-dimensional depth map is computed from the shadow information. With the transformation model, the final reconstruction merges these two maps to generate three-dimensional point cloud images of underwater objects.

Published
2017

4. Tunable Dual-Bandpass Microwave Photonic Filter Based on Chirped Fiber Bragg Grating

Author

沃江海 Wo Jianghai, 杜鹏飞 Du Pengfei, 余岚 Yu Lan, 张钧凯 Zhang Junkai, 丛雯珊 Cong Wenshan, and 赵彪 Zhao Biao

Subjects
Materials science, Band-pass filter, Fiber Bragg grating, business.industry, Optoelectronics, Electrical and Electronic Engineering, business, Microwave photonic filter, Atomic and Molecular Physics, and Optics, Dual (category theory)
Published
2019

5. Photonic Approach of Generating Phase-Coded Signal with Tunable Frequency Multiplication Factor Based on Cascaded MZMs

Author

余岚 Yu Lan, 王安乐 Wang An-le, 徐馨 Xu Xin, 罗雄 Luo Xiong, 沃江海 Wo Jianghai, 丛雯珊 Cong Wenshan, 张进 Zhang Jin, and 杜鹏飞 Du Pengfei

Subjects
Physics, business.industry, Factor (programming language), Phase (waves), Optoelectronics, Multiplication, Photonics, business, Signal, computer, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, computer.programming_language
Published
2018

6. Design and stationary characteristic analysis of magnetic system of small capacity permanent magnet DC contactor

Author

Xiaoming Liu, Chunguang Hou, Yundong Cao, Du Pengfei, and Shuxin Liu

Subjects
Engineering, Magnetic energy, Electropermanent magnet, business.industry, Position (vector), Magnet, Electrical engineering, Mechanical engineering, Permanent magnet synchronous generator, business, Finite element method, Contactor, Magnetic field
Abstract

Permanent magnet DC contactor has the advantages of simple structure, low energy consumption and low noise. A magnetic system structure applicable to DC contactor is presented in this paper. Based on the traditional structure of single coil and single stable position contactor, an auxiliary gas gap is added. By changing the size of the gas gap to change the attraction of permanent magnet, the whole magnetic system improves the reliability of breaking-closing operating. A mathematical model of the magnetic system is established, and the magnetic field and the stationary characteristic are calculated by using finite element method. According to the calculations, cooperation between attraction characteristics and counterforce characteristics is analyzed and the result indicates that the magnetic system, which has a advantages of strong electromagnetic actuation, reliable breaking, manual resetting without disassembly, can be used in industrial production.

Published
2011

7. Radar weak target detection and location based on Hough transform

Author

Du Pengfei, Wang Yonglian, and Sun Wenfeng

Subjects
Early-warning radar, Computer science, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, ComputerApplications_COMPUTERSINOTHERSYSTEMS, Fire-control radar, law.invention, Hough transform, Passive radar, Radar engineering details, law, Radar imaging, ComputerSystemsOrganization_SPECIAL-PURPOSEANDAPPLICATION-BASEDSYSTEMS, Computer vision, Radar, Radar horizon, Physics::Atmospheric and Oceanic Physics, Low probability of intercept radar, Radar tracker, Pulse-Doppler radar, business.industry, Radar lock-on, Continuous-wave radar, Inverse synthetic aperture radar, Bistatic radar, Man-portable radar, Computer Science::Graphics, Computer Science::Computer Vision and Pattern Recognition, 3D radar, Clutter, Artificial intelligence, business
Abstract

The Hough transform (HT) is analyzed and applied to radar weak target detection and location in this paper. The literature, in which only search radar is used, is extended to more general radar system. The theoretical analysis and experimental results used real-life radar data show that the presented method performs well in the strong clutter background, and robust to the clutter distribution.

Published
2003

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