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IEEE International Geoscience and Remote Sensing Symposium

作者： Nuno Miranda Betlem Rosich Cosimo Putignano ESA/ESRIN Serco

The Sentinel-1 Instrument processing Facility (IPF) is the sub-system of the Sentinel-1 Payload Data Ground Segment (PDGS) [ 1] responsible for the generation of the Level-1 and Level-2 products. This paper provides a... 详细信息

ISBN: (纸本)9781467311601

关键词： Sentinel-1 SAR Products Processor PROCESSOR Idiopathic Pulmonary Fibrosis SUB-SYSTEM processing algorithm Tea Payload

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A High-Accuracy Visual Marker Based on a Microlens Array

A High-Accuracy Visual Marker Based on a Microlens Array

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IEEE/RSJ International Conference on Intelligent Robotics and Systems

作者： Hideyuki Tanaka Yasushi Sumi Yoshio Matsumoto Intelligent Systems Research Institute National Institute of Advanced Industrial Science and Technology Tsukuba Ibaraki JAPAN

ISBN: (纸本)9781467317375

Visual markers are useful assistive tool for service robots. Existing planar visual markers have poor accuracy in pose estimation, especially in frontal direction. We solved this problem by a novel principle using a microlens array. The marker displays a changing moire pattern according to the visual-line direction. We can extract the pose information from the pattern by image processing using a single camera. The developed marker and the processing algorithm enable high-accuracy pose estimation even by observation from frontal direction. We verified its superiority to the conventional method by some validation tests. The marker is an extension of a marker we previously developed, and is more easily fabricated.

关键词： fabricated extension algorithm fabrication Microlenses Moire Patterns processing algorithm Service robots pose estimation Visualization algorithms Image processing

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UX Design and Agile: A Natural Fit?

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COMMUNICATIONS OF THE ACM 2011年第1期54卷 54-60页

作者： Gosper, Julian Agathos, Jean-Luc Rutter, Richard Coatta, Terry Vitrium Syst Vancouver BC Canada Clearleft Brighton E Sussex England BusinessObjects Paris Off Paris France

A case study is presented which examines user experience (UX) design, a software discipline which incorporates usability, human-computer interaction (HCI), and interactive design. A discussion incorporating software architect Jean-Luc Agathos, senior UX designer Julian Gosper, software engineer Terry Coatta, and Web designer Richard Rutter is presented. These experts discuss design projects such as BusinessObjects Polestar, a business intelligence (BI) query tool.

关键词： experience computer programs geolocation measurement computer human interaction Data structures processing algorithm Budgets computer software

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Design of a Novel Digital Phantom for EIT System Calibration

Design of a Novel Digital Phantom for EIT System Calibration

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society

作者： Nan Li Wei Wang Hui Xu Biomedical Engineering Research Group University of Sussex University of Sussex National University of Defense Technology

ISBN: (纸本)9781424441211

This paper presented the design method of a novel digital phantom for electrical impedance tomography system calibration. By current sensing, voltage generating circuitry and digital processing algorithms implemented in FPGA, the digital phantom can simulate different impedances of tissues. The hardware of the digital phantom mainly consists of current sensing section, voltage generating section, electrodes switching section and a FPGA. Concerning software, the CORDIC algorithm is implemented in the FPGA to realize direct digital synthesis (DDS) technique and related algorithms. Simulation results show that the suggested system exhibits sufficient accuracy in the frequency range 10 Hz to 2 MHz. With the advantages offered by digital techniques, our approach has the potential of speed, accuracy and flexibility of the EIT system calibration process.

关键词： Field programmable gate arrays Imaging Phantom design approach DIGITAL TECHNIQUES EIT Digit direct digital synthesis current sensing Digital frequency ranges processing algorithm

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Bird-Aircraft Strike Avoidance Radar

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IEEE AEROSPACE AND ELECTRONIC SYSTEMS MAGAZINE 2010年第1期25卷 19-28页

作者： Ning Huansheng Chen Weishi Mao Xia Li Jing Beihang Univ Sch Elect & Informat Engn Beijing 100191 Peoples R China CAAC Ctr Aviat Safety Technol Beijing 100028 Peoples R China

Avian radar system has been developed for bird-aircraft strike hazard avoidance. Two representative systems, which are countrywide and airport-based avian radar systems, are surveyed to summarize the state-of-the-art in this research field. Avian radar experimental system built by Beihang University is introduced in detail, including system architecture, performance analysis, and processing algorithm for bird target detection and tracking. This radar is operated in horizontal and vertical positions alternatively for scanning, and some experimental data are collected, respectively, at reservoir and airport. After processing of background subtraction, noise suppression, target information extraction, tracking and data fusion, a fused image containing bird targets and aircraft is provided. Finally, improvement suggestions on radar antenna, processing algorithms and risk assessment models of bird-aircraft strikes are given. Moreover, a scheme for practical systems applications at airport is proposed.

关键词： reservoirs Radar antennas Avifauna Data fusion Risk Assessment Airports scanning Hazard avoidance Risk Management Employee Strikes radar Aircraft Horizon Radar systems processing algorithm

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Gradiometric Seismoreceiver with a Magnetic Suspension in the Problems of Operative Earthquake Forecasting

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SEISMIC INSTRUMENTS 2010年第3期46卷 265-274页

作者： Vol'fson, G. B. Evstifeev, M. I. Kazantseva, O. S. Kalinnikov, I. I. Manukin, A. B. Matyunin, V. P. Shcherbak, A. G. CSRI Elektropribor St Petersburg Russia Russian Acad Sci Schmidt Inst Phys Earth Moscow Russia

The problems of nonconventional application of torsional mechanical systems as original seis-moreceivers are considered. The possibility to update the existing gradiometers for performing measurements on a mobile base and their utilization in solving the problems of investigations of peculiarities of a microseis-mic background with the aim of forecasting earthquakes is discussed in detail. It is shown that torsional systems with a contactless magnetic suspension meet many of the requirements for such type of devices and hardware complexes for the efficient solution of the problem stated can be developed.

关键词： torsional system seismoreceiver magnetic support earthquake forecast gravitational variometer processing algorithm

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Frame Design and algorithm Research on A New Image Acquisition System

Frame Design and Algorithm Research on A New Image Acquisiti...

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2nd International Conference on Machine Vision

作者： Li Bo Cheng Ping-guang Chongqing Educ Coll Chongqing 400067 Peoples R China

ISBN: (纸本)9780769539447

This paper analyzes the composition of the system video signal sampling frequency and the image acquisition system, designs the hardware structure and work processes of the image acquisition system, and specifies the system design direction and work principle. Finally it describes smoothing filter, edge detection image processing algorithms, and analyzes the experimental results to select the image processing algorithms the system needed, to apply it to the DSP in this system.

关键词： image acquisition system processing algorithm overall framework design

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LOS/NLOS DETECTION BY THE NORMALIZED RAYLEIGH-NESS TEST

LOS/NLOS DETECTION BY THE NORMALIZED RAYLEIGH-NESS TEST

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European signal processing conference

作者： F. Benedetto G. Giunta L. Vandendorpe Department of Applied Electronics University of Roma Tre via della Vasca Navale 84 00146 Rome Italy Communications and Remote Sensing Laboratory Universite Catholique de Louvain 1348 Louvain-la-Neuve Belgium

ISBN: (纸本)9781617388767

Deciding for the possible presence of a LOS component in a wireless radio link is preliminary to several operations that a communication receiver has to accomplish. In fact, NLOS radio models require more complex signal processing algorithms for data detection. We propose to adopt the normalized version of the Rayleigh-ness test (recently introduced for code acquisition purposes, as a measure of the Ricianity of the series under investigation) to obtain here a self-tunable test, independent of the actual power of the received signal. The achieved results evidence the robustness of the test.

关键词： communications receivers active power Radio links data detection code acquisition processing algorithm complex signal

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A method of combined indirect measurement for object quality parameters

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MEASUREMENT TECHNIQUES 2008年第8期51卷 825-830页

作者： Skvortsov, B. V. Zhiganov, I. Yu. Korolev Samara State Aerospace University Samara Russia

A method is considered for measuring object quality parameters that can arise through indirect parameters, and in particular electrophysical signals acting on the object. Methods are given for obtaining a mathematical model for the measurement procedure and examples are quoted of the method applied with the use of spectrometric characteristics of the object.

关键词： quality parameters indirect electrophysical parameters calibration processing algorithm

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Investigation of optimum X-ray beam tube voltage and filtration for chest radiography with a computed radiography system

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BRITISH JOURNAL OF RADIOLOGY 2008年第970期81卷 771-777页

作者： Moore, C. S. Beavis, A. W. Saunderson, J. R. Princess Royal Hosp Dept Radiat Phys Hull & E Yorkshire Hosp Kingston Upon Hull HU8 9HE Yorks England Univ Hull Postgrad Med Inst Kingston Upon Hull HU6 7RX N Humberside England Sheffield Hallam Univ Fac Hlth & Wellbeing Sheffield S1 1WB S Yorkshire England

The purpose of this study was to determine the optimum tube voltage and amount of added copper (Cu) filtration for processed chest radiographs obtained with an Agfa 75.0 Computed Radiography (CR) system. The contrast-to-noise ratio (CNR) was measured in the lung, heart/spine and diaphragm compartments of a validated chest phantom using various tube voltages and amounts of Cu filtration. The CNR was derived as a function of air kerma at the CR plate and with the effective dose. As rib contrast can interfere with detection of nodules in chest radiography, a tissue-to-rib ratio (TRR) was derived to investigate which tube voltages suppress the contrast of rib. Although processing algorithms affect the signal and noise in a way that is hard to predict, we found that, for a given set of processing parameters, the CNR was related to the plate air kerma and effective dose in a logarithmic manner (all R-2 >= 0.97). For imaging of the lung region, a low voltage (60 kVp) produced the highest CNR, whereas a high voltage (125 kVp) produced the highest TRR. In the heart/spine region, 80125 kVp produced the highest CNR, while in the diaphragm region 60-90 kVp produced the highest CNR. For chest radiography with this CR system, the optimal tube voltage depends upon the region of interest. Of the filters tested, a 0.1 mm Cu thickness was found to provide a statistically significant increase in the CNR in the diaphragm region with tube potentials of 60 kVp and 80 kVp, without affecting the CNR in the other anatomical compartments.

关键词： computed radiography kVp Thoracic Radiography processing algorithm Filtration carrier to noise ratios

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