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International Conference on Localization and GNSS (ICL-GNSS)

作者： Andrei, Constantin-Octavian Kukko, Antero Kaartinen, Harri Satirapod, Chalermchon Chulalongkorn Univ Dept Survey Engn Bangkok 10330 Thailand Finnish Geodet Inst Dept Remote Sensing & Photogrammetry FI-02431 Masala Finland

ISBN: (纸本)9781479951239

Many professional communities nowadays require accurate position information. Although various location technologies are integrated in one device, GNSS remains one of the main sources of precise positioning information. Traditionally, GNSS precise positioning has been achieved in relative mode using differential principles. On the other hand, with the technological advances in GNSS technology and processing algorithms, nowadays, GNSS precise positioning can also be achieved in absolute mode using a single GNSS sensor in combination with precise information about the satellite orbits and clocks. Such absolute positioning algorithm is known as Precise Point Positioning. PPP takes advantage of the carrier phase observation, the most precise observation from a satellite system. In this work, a PPP algorithm is implemented and tested for absolute georeference of data captured by a boat-mounted mobile terrestrial remote sensing platform. The estimation scheme for kinematic PPP processing is modified accordingly in order to reflect the test dynamics. The test results demonstrate that centimetre level accuracies are achievable in kinematic mode although the main challenge is to keep continuous satellite signal tracking. In addition, robust quality control and better outlier detection algorithms may further increase the usability of GNSS precise point positioning using carrier phase observations.

关键词： Accuracy Global Positioning System Mobile communication Three-dimensional displays Trajectory three-dimensional displays point location mobile communication Global Positioning Systems trajectory carrier phase Global Navigation Satellite System precise registration remote sensing platform Satellite systems Public-Private Sector Partnerships Point-to-Point Protocol processing algorithm

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Novel Wireless Sensors Network Routing Approach for Industrial Process Control

Novel Wireless Sensors Network Routing Approach for Industri...

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10th International Multi-Conference on Systems, Signals and Devices (SSD)

作者： Hayder, Wafa Abdellaoui, Mahmoud Natl Sch Engn EE Dept Sfax Tunisia

ISBN: (纸本)9781467364577;9781467364591

The present work treats the problem of routing data within a wireless sensors network (WSN) for industrial process control. Our application interests British Gas to monitor the level of propane in a tank. The considered methodology is based on the algorithm CSMA / CA Slotted to access the medium, the processing algorithm measures the volume of propane to exploit failing sensors and intelligent routing algorithm transmission value through the base station while ensuring minimizing energy consumption and maximizing the life time of nodes. The combination of these mechanisms gives birth to a new approach which has been applied to a WSN installed in the industry in order to analyze the performance of the techniques developed for the quality of service Qos, the energy conservation and extension of life.

关键词： Wireless Sensors Network algorithm CSMA / CA Slotted processing algorithm Routing algorithm Energy conservation Quality of service Qos Elongation of life

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processing Reference Model for TRS-4D Radar Tests

Processing Reference Model for TRS-4D Radar Tests

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International Radar Symposium

作者： Michael Schikorr Axel Domann Jochen Meyer-Hilberg Gunter Wolf Martin Wranik Ulrich Fuchs EADS Deutschland GmbH

ISBN: (纸本)9781467348218

TRS-4D is the latest generation of the naval radars of Cassidian. The TRS-4D is a multifunction radar for sea and air surveillance and target acquisition, operating in C-band. The radar is based on the latest Active Electronically Scanning Array (AESA) technology. Two variants of the radar are developed - a rotating version and a non-rotating version with four fixed array panels. The processing algorithms of the radar were reproduced in a Matlab reference model. The paper illustrates the use of the reference model during the development and test phase.

关键词： reference model radar processing algorithm TARGET ACQUISITION multifunction radar AESA Seas

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A Multi-Baseline Stereo System for Scene Segmentation in Natural Environments

A Multi-Baseline Stereo System for Scene Segmentation in Nat...

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IEEE Conference on Technologies for Practical Robot Applications

作者： Annalisa Milella Giulio Reina Mario Massimo Foglia Institute of Intelligent Systems for Automation (ISSIA) National Research Council (CNR) Department of Engineering for Innovation University of Salento Department of Mechanics Mathematics and Management Polytechnic of Bari

ISBN: (纸本)9781467362238

A long range visual perception system is presented based on a multi-baseline stereo frame. The system is intended to be used onboard an autonomous vehicle operating in natural settings, such as an agricultural environment, to perform 3D scene reconstruction and segmentation tasks. First, the multi-baseline stereo sensor and the associated processing algorithms are described;then, a self-learning ground classifier is applied to segment the scene into ground and non-ground regions, using geometric features, without any a priori assumption on the terrain characteristics. Experimental results obtained with an off-road vehicle operating in an agricultural test field are presented to validate the proposed approach. It is shown that the use of a multi-baseline stereo frame allows for accurate reconstruction and scene segmentation at a wide range of viewing distances, thus increasing the overall flexibility and reliability of the perception system.

关键词： segmentation reconstruction autonomous segmentation Segmentation Reconstructions Acoustic equipment Reconstructive Surgical Procedures wide-range Natural environment processing algorithm Autonomous Vehicles road vehicles ground Environments

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Novel Time-Frequency-Eigen Filter for Intraoperative Neurophysiologic Monitoring in Spinal Surgeries

Novel Time-Frequency-Eigen Filter for Intraoperative Neuroph...

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International IEEE/EMBS Conference on Neural Engineering

作者： Krishnatej Vedala S. M. Amin Motahari Mohammed Goryawala Mercedes Cabrerizo Ilker Yaylali Malek Adjouadi Center for Advanced Technology and Education FIU College of Engineering and Computing Department of Clinical Neurophysiology Oregon Health and Science University

ISBN: (纸本)9781467319676

We present a novel signal-processing algorithm to extract the posterior tibial somatosensory evoked potentials (tSSEP) using a minimum number of trials. We analyze the proposed algorithm and compare it with the clinically used conventional signal averaging method for 12 surgical procedures. The tSSEP trials are continuously fed to our processing algorithm that displays the extracted SSEP after processing 12 successive unrejected sweeps. A unique filtering process employing time, frequency and eigen systems, in that order, was used to extract the SSEP from this set of 12 trials. The algorithm then detects, marks and records the P37 and N45 peaks using the first order differentials obtained through Walsh transformation. The monitoring using the algorithm was successful and proved conclusive to the clinical information through the different surgical procedures. Higher accuracy and faster execution time in determining the SSEP signals provides for a much improved and effective neurophysiological monitoring process.

关键词： execution time processing algorithm experimentation Surgery Operative Surgical Procedures Cyclin H Trials algorithms Signal averaging Filters signal processing

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State-of-the-Art in cw Photomixing Systems

State-of-the-Art in cw Photomixing Systems

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International Conference on Fiber Optics and Photonics (PHOTONICS)

作者： Deninger, Anselm J. TOPTICA Photon AG D-82166 Graefelfing Germany

ISBN: (纸本)9781467347181

Frequency-domain terahertz techniques offer spectral selectivity, high resolution and excellent signal-to-noise ratios. Two-color distributed feedback (DFB) diode lasers now form the basis of compact and portable systems. Photomixers - photoconductors or fast p-i-n photodiodes - convert the optical beat signal of the two lasers into tunable, narrow-band terahertz radiation. Optimized laser tuning and data processing algorithms reduce the acquisition time for a complete spectrum from several hours to below 2 minutes. This talk compares THz systems based on GaAs photomixer technology and recent developments using InGaAs/InP emitters and detectors. Selected application examples are presented.

关键词： acquisition time BEAT SIGNALS Optical mixing Laser tuning Arts terahertz gallium arsenides optical mixer optical beat PIN photodiodes portable system processing algorithm spectral selectivity Photoconductors

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SIMD/MIMD dynamically-reconfigurable architecture for high-performance embedded vision systems

SIMD/MIMD dynamically-reconfigurable architecture for high-p...

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23rd IEEE International Conference on Application-Specific Systems, Architectures and Processors (ASAP)

作者： Nieto, A. Vilarino, D. L. Brea, V. M. Univ Santiago de Compostela Ctr Invest Tecnoloxias Informac CITIUS Santiago De Compostela Spain

ISBN: (纸本)9780769547688

Image and video processing algorithms are becoming more and more sophisticated. An efficient hardware architecture is a requirement in order to address effectively the increasing computational workload. In a context of high performance, low cost and rapid prototyping, a hybrid SIMD/MIMD architecture for image processing is proposed in this work. By reusing functional units and including a dynamically reconfigurable datapath, this architecture enables high performance devices for general image processing tasks with high application development productivity when using as part of a System-on-Chip. A 32-bit 128-unit coprocessor was prototyped on a Virtex-6 FPGA and results show a peak performance of 19.6 GOP/s.

关键词： computer vision HIGH-PERFORMANCE image processing task processing algorithm ARCHITECTURE Building construction Reconfigurable architectures peak performance hardware architecture Image processing Image images Coprocessors embedding

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Extending Cylindrical Mathematical Absorber Reflection Suppression To Further Reduce Range Scattering Errors

Extending Cylindrical Mathematical Absorber Reflection Suppr...

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Loughborough Antennas and Propagation Conference (LAPC)

作者： Gregson, S. F. Newell, A. C. Hindman, G. E. Nearfield Syst Inc Torrance CA 90502 USA

ISBN: (纸本)9781467322195

Recent work in developing a mode orthogonalisation and filtering post processing algorithm for multipath suppression in far-field and planar near-field antenna measurement systems has enabled worthwhile improvements to be obtained from the analogous, but mathematically and computationally distinct, cylindrical analogue. This paper presents an overview of the measurement and novel post-processing algorithm as embodied within the cylindrical mathematical absorber reflection suppression technique as well as comparing and contrasting results obtained from the new post-processing algorithms with previously published data.

关键词： processing algorithm Cylindrical far-field Reflection Filtration conflicting design Antenna measurements Compare and contrast broadcasting Scattering POST-processing

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MOBILE CLOUD COMPUTING EDUCATIONAL TOOL FOR IMAGE/VIDEO processing algorithmS

MOBILE CLOUD COMPUTING EDUCATIONAL TOOL FOR IMAGE/VIDEO PROC...

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IEEE Digital Signal processing Workshop/IEEE Signal processing Education Workshop (DSP/SPE)

作者： Ferzli, Rony Khalife, Ibrahim Microsoft Corp Unified Commun Grp Redmond WA 98052 USA Univ Valencia Grp Inf & Comm Syst Valencia Spain

ISBN: (纸本)9781612842271

This paper shows the importance and benefit of coupling cloud computing with mobile especially due to power limitations that mobile devices exhibit. Moreover, the work done shows that mobile computing can be applied for educational purposes, where a tool for students termed Mobi4Ed is presented. This educational tool aims at exploiting the concept of cloud computing in the context of image and video processing, where students can assess several algorithms in real-time. Two possible system architectures are detailed, where one uses the cellular channel and the other uses the data channel. Consequently, one of the approaches is adopted and a detailed simulation is done where an Android client device is shown communicating with a server running openCV and using the Haar face-detection algorithm. The work assures the credibility of the adopted system architecture, in terms of deployment, and several future lines of work are proposed.

关键词： Cloud Computing Mobile processing algorithm Educational objectives Building systems Students Mobile Computing Mobile devices deployment Facial Recognition

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Automatic Generation of Optimized and Synthesizable Hardware Implementation from High-Level Dataflow Programs

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VLSI DESIGN 2012年第unknown期2012卷 375-388页

作者： Jerbi, Khaled Raulet, Mickael Deforges, Olivier Abid, Mohamed UMR CNRS 6164 IETR INSA F-35043 Rennes France Natl Engn Sch Sfax CES Lab Sfax 3038 Tunisia

In this paper, we introduce the Reconfigurable Video Coding (RVC) standard based on the idea that video processing algorithms can be defined as a library of components that can be updated and standardized separately. MPEG RVC framework aims at providing a unified high-level specification of current MPEG coding technologies using a dataflow language called Cal Actor Language (CAL). CAL is associated with a set of tools to design dataflow applications and to generate hardware and software implementations. Before this work, the existing CAL hardware compilers did not support high-level features of the CAL. After presenting the main notions of the RVC standard, this paper introduces an automatic transformation process that analyses the non-compliant features and makes the required changes in the intermediate representation of the compiler while keeping the same behavior. Finally, the implementation results of the transformation on video and still image decoders are summarized. We show that the obtained results can largely satisfy the real time constraints for an embedded design on FPGA as we obtain a throughput of 73 FPS for MPEG 4 decoder and 34 FPS for coding and decoding process of the LAR coder using a video of CIF image size. This work resolves the main limitation of hardware generation from CAL designs.

关键词： Embedded design FES gene Computer hardware Videotapes data flow autogeneration Moving Pictures Experts Group coding compilers processing algorithm Tool Sets

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