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5th International Symposium on Photoelectronic Detection and Imaging - Laser Sensing and Imaging and Applications

作者： Ye, Junwei Tao, Luo Yang, Kecheng Xia, Min Li, Wei Guo, Wenping Liu, Hao Huazhong Univ Sci & Technol Sch Opt & Elect Informat Wuhan 430074 Peoples R China

ISBN: (纸本)9780819497741

We present a fast, simple, sub-pixel algorithm on the critical angle refractometer to measure the refractive index of the liquid sample by determining the centroid of the light intensity of the relative reflective curve. The centroid algorithm utilizes a divergent fiber-coupled royal blue LED source to irradiate on the dielectric surface between the prism and the media, which generates the light intensity distribution of the reflectance facula. Instead of the critical angle pixel as the differential algorithm and the threshold algorithm, the sub pixel centroid algorithm is based on calculating the centroid value of the light intensity of the relative reflective curve. In some moderate turbid solutions, the centroid algorithm is less sensitive to the scattering and absorption than the differential algorithm and the threshold algorithm. It is possible to utilize the centroid point of the relative reflective curve to determine the refractive index. Supported by the theoretical analysis and experimental results on saline solutions, we can conclude that the proposed algorithm is effective to get the super resolution and meaningful to the refractive index measurement of the liquid. The critical angle refractometer with this centroid method is potential to be a high-accuracy, high-resolution, and reliable automatic refractometer.

关键词： Critical angle refractometer centroid algorithm Differentiation algorithm

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A Research on Positioning Technology Based on Internet of Things

A Research on Positioning Technology Based on Internet of Th...

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International Conference on Sensors, Measurement and Intelligent Materials (ICSMIM 2012)

作者： Zou, Dongyao Sun, Hui Chen, Yan Li, Nana Zhengzhou Univ Light Ind Sch Comp & Commun Engn Zhenzhou Peoples R China

With the advent of Internet of things, more and more applications require location-based services. This paper firstly introduces classification of positioning technology, then some of the commonly used positioning tec... 详细信息

ISBN: (纸本)9783037856529

关键词： TOA AOA RSSI centroid algorithm APIT

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Squared Gray Weighted centroid algorithm Based on Bi-cubic Interpolation

Squared Gray Weighted Centroid Algorithm Based on Bi-cubic I...

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5th International Symposium on Instrumentation Science and Technology

作者： Liu Changying Gao Yinhan Zhang Yong Jilin Univ Coll Instrumentat & Elect Engn Changchun 130061 Peoples R China Jilin Univ Ctr Measurement Sci Expt Changchun 130025 Peoples R China

ISBN: (纸本)9780819473677

A squared gray weighted centroid algorithm based on bi-cubic interpolation is proposed to solve the question of the optical feature precision location in the vision measurement. The location method makes full use of the gray information of feature image and uses the squared gray as weight to increase the function of pixels with higher gray value. At the same time, the bi-cubic interpolation algorithm is used to increase the available pixels to improve the location accuracy. Experimental results show that the location repeatability was less than 0.011 pixels and the location errors were less than 0.01 pixels. The centroid location method has better location accuracy and could be used for the precision location of optical feature for the vision measurement.

关键词： vision measurement bi-cubic interpolation centroid algorithm optical feature

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Improved Iteration centroid algorithm Based on Linear CCD Light-spot Location

Improved Iteration Centroid Algorithm Based on Linear CCD Li...

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2009 9th International Conference on Electronic Measurement & Instruments（ICEMI’2009）

作者： Shengjin Tang Zhaofa Zhou Xiaosong Guo Yongchao Xiao Xi’an Research Inst. of Hi-tec Hongqing Town, Xi’an 710025 China

In order to increase the linear CCD light-spot location accuracy and strengthen the ant-noise ability of centroid algorithm, an improved algorithm is presented. According to the symmetry distribution and high gray value of the object region, squared weight method and linear interpolation are used to enhance the effect of object region. Meanwhile, linear interpolation and iteration algorithm are utilized to improve the resolution and accuracy on signal segmentation. The simulation result shows that it is more accurate and stable than other sub-pixel algorithm, and the satisfying result is obtained.

关键词： light-spot location centroid algorithm squared weighting linear interpolation iteration algorithm

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Improved Iteration centroid algorithm Based on Linear CCD Light-spot Location

Improved Iteration Centroid Algorithm Based on Linear CCD Li...

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2009 9th International Conference on Electronic Measurement & Instruments(第九届电子测量与仪器国际会议 ICEMI'2009)

作者： Shengjin Tang Zhaofa Zhou Xiaosong Guo Yongchao Xiao Xi'an Research Inst.of Hi-tec Hongqing Town Xi'an 710025 China

ISBN: (纸本)9781424438631;9781424438624

关键词： light-spot location centroid algorithm squared weighting linear interpolation iteration algorithm

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Development of a Fine Digital Sun Sensor for STSAT-2

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INTERNATIONAL JOURNAL OF AERONAUTICAL AND SPACE SCIENCES 2012年第2期13卷 260-265页

作者： Rhee, Sung-Ho Lyou, Joon Korea Adv Inst Sci & Technol Satellite Technol Res Ctr Taejon 305701 South Korea Chungnam Natl Univ Dept Elect Engn Taejon 305764 South Korea

Satellite devices for fine attitude control of the Science & Technology Satellite-2 (STSAT-2). Based on the mission requirements of STSAT-2, the conventional analog-type sun sensors were found to be inadequate, motivating the development of a compact, fast and fine digital sun sensor (FDSS). The FDSS uses a CMOS image sensor and has an accuracy of less than 0.03degrees, an update rate of 5Hz and a weight of less than 800g. A pinhole-type aperture is substituted for the optical lens to minimize its weight. The target process speed is obtained by utilizing the Field Programmable Gate Array (FPGA), which acquires images from the CMOS sensor, and stores and processes the image data. The sensor accuracy is maintained by a rigorous centroid algorithm. This paper describes the FDSS designs, realizations, tests and calibration results.

关键词： STSAT-2 FDSS CMOS-image sensor(CIS) Pinhole-type aperture centroid algorithm

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Determination of the dependence of the error in measuring displacements by optoelectronic instruments with multielement radiation receivers on the signal-to-noise ratio

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MEASUREMENT TECHNIQUES 2012年第5期55卷 563-567页

作者： Soldatov, V. P. Moscow State Univ Geodesy & Cartog MIIGAiK Moscow Russia

A new simplified approach to establishing an approximate functional relation between the error in measuring displacements by optoelectronic instruments with multielement radiation receivers and the signal-to-noise ratio is considered. The approximate formulas obtained can be used for images with small dimensions both for accurate and energy calculations of such instruments.

关键词： centroid algorithm displacement signal-to-noise ratio multielement radiation receiver

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The Weighted Localization algorithm Based on RSSI Calibration

The Weighted Localization Algorithm Based on RSSI Calibratio...

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2012 3rd International Conference on Information Technology for Manufacturing Systems(ITMS 2012)

作者： He Ninghui Li Hongsheng Bian Guangrong Department of Mechanical & Electrical Engineering College Wuhan university of Technology Air Force Service College Department of Automation College Wuhan university of Technology

This paper introduces the first wireless sensor network node localization in two ways, one is based on the RSSI ranging approach, and the other is based on the weighted centric location algorithm, as a result of environmental factors, the same RSSI value the distance,but the corresponding values are not always the same, these two methods do not consider the environmental impact to the RSSI ***, we consider combining the distance and signal strength information as a reference to correct each beacon node weights, in order to improve positioning accuracy.

关键词： Node localization Wireless sensor networks centroid algorithm RSSI Range

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Accuracy of RSS-Based centroid Localization algorithms in an Indoor Environment

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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 2011年第10期60卷 3451-3460页

作者： Pivato, Paolo Palopoli, Luigi Petri, Dario Univ Trento Dept Comp Sci & Informat Engn I-38123 Trento Italy

In this paper, we analyze the accuracy of indoor localization measurement based on a wireless sensor network. The position estimation procedure is based on the received-signal-strength measurements collected in a real indoor environment. Two different classes of low-computational-effort algorithms based on the centroid concept are considered, i.e., the weighted centroid localization method and the relative-span exponential weighted localization method. In particular, different sources of measurement uncertainty are analyzed by means of theoretical simulations and experimental results.

关键词： centroid algorithm localization propagation model wireless sensor networks (WSNs)

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A novel video based vehicle detection algorithm and its application

A novel video based vehicle detection algorithm and its appl...

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7th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM)

作者： Zhang-Geng Tang zhi-ling Wen Wu Chongqing Technol & Business Inst Chongqing 400052 Peoples R China

ISBN: (纸本)9781424462520

To overcome the drawback and limitation of the traditional vehicle detector in the electronic police system, this paper proposes a novel video detection method by improving the inter-frame difference method and combining the amount of pixels and the position of the centroid in foreground image to detect vehicle in complex situation. The proposed method can reduce the redundant information of video and has the lower computational complexity. Moreover, it can also capture the vehicles violating traffic laws and regulations effectively, and improve real-time.

关键词： Video detection Inter-Frame difference Feature information centroid algorithm

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