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Annual Conference of the Chinese-Society-for-Optical-Engineering on Applied Optics and Photonics, China (AOPC)

作者： Zhang, Dayong Li, Sining Lu, Wei Tu, Zhipeng Zhang, Junwei Xu, Xianmei Wang, Wei Yan, Xu Harbin Inst Technol Sch Inst Optoelect Harbin 15001 Heilongjiang Peoples R China

ISBN: (纸本)9781628418996

We have developed two range gating laser imaging systems, which base on modulated gain method and centroid algorithm respectively. The system based on centroid algorithm uses a pulse laser as transmitter and CCD with image intensifier, through delaying gated receiver repetitiously to acquire a series of 2D time-slicing image to restore the three-dimensional rang image. The imaging system based on modulated gain mainly adopts the same pulse laser is used and CCD with image intensifier with constant and modulated gain over time, which can capture two different intensity images of echo pulse respectively in order to restore the three-dimensional range image. We conduct a series of experiments with the tow system, and the results are consistent with the actual practical ones. By comparing result of laser imaging based on the two systems, we summarize the different strength and weaknesses, requirements, and challenges to lay a solid foundation for later experiments.

关键词： time-slicing technique centroid algorithm modulated gain mtethod range gating laser radar

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Localization algorithm Based on Region Segmentation Line for Wireless Sensor Networks

Localization Algorithm Based on Region Segmentation Line for...

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2015 6th IEEE International Conference on Software Engineering and Service Science(ICSESS 2015)

作者： Leqiang Bai Yongwei Wang Information ＆ Control Engineering Faculty Shenyang Jianzhu University

In order to improve the issue about the low localization accuracy of unknown nodes,this paper proposes a kind of improved region segmentation localization *** the precondition of building the mathematical model of region segmentation,the algorithm utilizes the ratio which the unknown node received signal strength from the beacon nodes comparing with the signal strength scale factor of the region segmentation line to make sure the sub region of the unknown *** algorithm calculates the centroid coordinate of this sub region and takes the centroid coordinate as the location coordinate of the unknown *** simulation results show that the average localization accuracy has been improved compared with centroid localization algorithm and improved centroid localization algorithm.

关键词： wireless sensor networks centroid algorithm region segmentation line localization accuracy

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centroid Based 3D Localization Technique Using RSSI With a Mobile Robot

Centroid Based 3D Localization Technique Using RSSI With a M...

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International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Amarlingam, M. Rajalakshmi, P. Netad, Vinod Kumar Yoshida, Masaya Yoshihara, Kiyohito Indian Inst Technol Hyderabad Dept Elect Engn Hyderabad Andhra Prades India KDDI R&D Labs Inc Green & Applicat Lab M2M Iidabashi Japan

ISBN: (纸本)9789860334074

Knowledge of sensor node 3D location in a sensor network is more important, because many practical applications needs to know the location of sensor data source. This paper presents a new technique for finding indoor 3D location of a sensor node by using Received Signal Strength Indication (RSSI). Proposed localization algorithm is derived from centroid algorithm with composition of empirical path loss model. It gives less error in estimating 3D location of sensor node in a sensor network when compared to its actual location. algorithm has been implemented and analysed by using IITH motes and a Mobile Robot.

关键词： RSSI centroid algorithm 3D localization

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Extracting the centroid from the Sun-moon Image in Astronomy Orientation 33

Extracting the Centroid from the Sun-moon Image in Astronomy...

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33rd Chinese Control Conference (CCC)

作者： Han Yong-qi Bai Yong-qiang Jia Feng-kai Beijing Inst Technol Dept Automat Beijing 100081 Peoples R China Minist Educ Key Lab Complex Syst Intelligent Control & Decis Beijing 100081 Peoples R China

ISBN: (纸本)9781479947249

In astronomical orientation, we usually choose the sun, the moon as observation objects, using the theodolite to obtain the horizontal and vertical scale readings as the crosshair theodolite and astral edge are tangent. This operation is subjective to human disturbance, affecting the orientation precision afterwards. Comparing to the previous method, the method of image processing is much simple in operation, and reduces the manual intervention as long as the sun and the moon are within the scope of the CCD imaging. After imaging, we first extract the object centroid coordinates from the embedded image module, and then according to the imaging model, we get the angle of visual axis interacts with the center line of the stars. This article analyzes the main characteristic of the sun-moon image and discusses the various circumstances image centroid algorithm for fitting. The algorithm is able to separate the sun and moon from complex background environment. Besides, even in the cases of the poor quality of the images, such as stars appear some incompleteness, low star brightness, or fuzzy boundaries, the algorithm can still locate the edge effectively with better fitting.

关键词： Astronomical Orientation Image Processing centroid algorithm

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Bio-inspired coupled oscillatory phase reset control system applied to movement in an underwater vehicle

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ROBOTICS AND AUTONOMOUS SYSTEMS 2014年第2期62卷 257-266页

作者： Porras, A. Llinas, R. NYU Sch Med Dept Neurosci & Physiol New York NY 10016 USA

The present hardware circuit was designed as a fast and energy efficient motor control system based on cerebellar oscillatory neuron activity and network dynamics. Specifically, a hardware model of the olivo-cerebellar dynamics controlling vertebrate motor coordination is used to control movement in an underwater robotic vehicle. Single shot oscillatory phase resetting is used for instantaneous motor plant reorganization based on incoming sensory information. Such a rapid feedback mode, which is rapid enough to prevent animals from falling when they stumble, has been previously described in biological and mathematical papers (Pellionisz and Llinas, 1979, Velarde et al., 2002, 2004). In the present control system, the direction of the vehicle displacement is captured by a camera, and transformed into a phase shift modulation of sets of oscillatory elements that embody internal dynamics. This design provides a novel real time control platform for robotic control in three dimensions. (C) 2013 Elsevier B.V. All rights reserved.

关键词： Underwater vehicle Olivo-cerebellar system Inferior olive centroid algorithm Motor-controllers Phase modulation Sine wave generator Step motor Pattern generator CMUcam2

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3D Reconstruction of Large Target by Range Gated Laser Imaging 3

3D Reconstruction of Large Target by Range Gated Laser Imagi...

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Conference on Optoelectronic Imaging and Multimedia Technology III

作者： Li, Sining Yan, Xu Wang, Wei Zhang, Dayong Lu, Wei Harbin Inst Technol Inst Optoelect Harbin 15006 Heilongjiang Peoples R China

ISBN: (纸本)9781628413465

We have developed a whole set of range gated laser imaging system with similar to 3km maximum acquisition distance, the system uses a Nd:YAG electro-optical Q-switched 532nm laser as transmitter, a double micro channel plate as gated sensor, all the components are controlled by the a trigger control unit with accuracy of subnanosecond. A imaging scheme is designed for imaging the large building similar to 500m away, and a sequence of images are obtained in the experiment, which are the basic data for 3D reconstruction;to improve the range resolution, we study the temporal distribution of intensity of the received signal, and use centroid algorithm for data processing. We compare the 3D image with the theoretical model, and the results are corresponding.

关键词： range gated laser imaging 3D reconstruction centroid algorithm

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Research on 3D Reconstruction by Multi-Directional Range Gated Laser Imaging 4

Research on 3D Reconstruction by Multi-Directional Range Gat...

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4th International Conference on Instrumentation and Measurement, Computer, Communication and Control (IMCCC)

作者： Li, Sining Li, Chao Lu, Wei Zhang, Dayong Tu, Zhipeng Harbin Inst Technol Inst Optoelect Harbin 150006 Peoples R China

ISBN: (纸本)9781479965755

The objective of the research is to prove the 3D reconstruction capability of the range-gated laser imaging technique. To investigate this, we have designed and developed a whole set of system for high precision three-dimensional imaging. The system uses a Nd:YAG electro-optical Q-switched 532nm laser as transmitter, an image intensify tube with double micro channel plate as gated sensor, and all the components are controlled by a trigger control unit with accuracy of subnanosecond. For imaging various aspects of the target object, a multi-directional imaging scheme is designed;experiments are performed to obtain the sequences of images. A set of algorithms is also developed and used to reconstruct the 3D image basing on centroid algorithm. Experimental results imply that the multidirectional imaging method is efficient and feasible.

关键词： range gated lidar centroid algorithm multi-directional imaging

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Experimental Research on 3D Reconstruction through Range Gated Laser Imaging 7

Experimental Research on 3D Reconstruction through Range Gat...

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7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT) - Large Mirrors and Telescopes

作者： Li, Sining Lu, Wei Zhang, Dayong Li, Chao Tu, Zhipeng Harbin Inst Technol Inst Optoelect Harbin 15006 Heilongjiang Peoples R China

ISBN: (纸本)9781628413557

A range gated laser imaging system has been designed and developed for high precision three-dimensional imaging. The system uses a Nd: YAG electro-optical Q-switched 532nm laser as transmitter, a double microchannel plate as gated sensor, and all the components are controlled by a trigger control unit with accuracy of subnanosecond. An experimental scheme is also designed to achieve high precision imaging;a sequence of 2D "slice" images are acquired in the experiment, and these images provide the basic data for 3D reconstruction. Basing on the centroid algorithm, we have developed the 3D reconstruction algorithm, and use it to reconstruct a 3D image of target from the experimental data. We compare the 3D image with the system performance model, and the results are corresponding.

关键词： range gated laser imaging 3D reconstruction centroid algorithm

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centroid-Based algorithm for Extracting Feature Points of Digital Cameras' Position

Centroid-Based Algorithm for Extracting Feature Points of Di...

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International Conference on Information Computing and Applications

作者： Xu, Guangli Wang, Zhijiang Zhou, Guanchen Hebei Polytech Univ Coll Sci Tangshan 063009 Hebei Peoples R China Hebei Polytech Univ Coll Light Industry Tangshan 063009 Hebei Peoples R China

ISBN: (纸本)9783642163388

Digital cameras have been widely used in the areas of road transportation, railway transportation as well as security system. To address the position of digital camera in these fields this paper proposed a geometry calibration method based on feature point extraction of arbitrary target. Under the meaning of the questions, this paper first defines four kinds of coordinate system, which is the world coordinate system. The camera's optical center of the coordinate system is the camera coordinate system, using the same point in different coordinate system of the coordinate transformation to determine the relationship between world coordinate system and camera coordinate.

关键词： Transition matrix centroid algorithm least-squares method binocular calibration

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Research on Zigbee Locating System Based on the Multi-hop Weighted centroid algorithm

Research on Zigbee Locating System Based on the Multi-hop We...

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2nd International Conference on Intelligent Computation Technology and Automation

作者： Zhang Qinghui Jin Guangfeng Xiang Yunqiang Henan Univ Technol Dept Informat Sci & Engn Zhengzhou 450000 Henan Province Peoples R China CPLA Air Def Forces Command Acad Zhengzhou Peoples R China

ISBN: (纸本)9780769538044

Zigbee node locating is one of the key technologies in wireless sensor network. Through the analysis on the existing single-hop centroid algorithm, a multi-hop weighted centroid locating algorithm has been put forward. The weighted factor is determined by the different impact of beacon node on unknown node so as to improve the locating accuracy. Multi-hop weighted centroid locating algorithm is simple when calculating and communication among the nodes is cost-free when locating. The algorithm is based on the strength of received single (RSSI). The simulation has showed that it has achieved a better locating accuracy.

关键词： Zigbee locating centroid algorithm multi-hop weighted

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