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Adaptive sensing for environment monitoring using wireless sensor networks

Adaptive sensing for environment monitoring using wireless s...

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IEEE conference on Wireless communications and Networking

作者： T. Arici Y. Altunbasak Center for Signal and Image Processing Georgia Institute of Technology Atlanta GA USA Georgia Institute of Technology Atlanta GA US

We present adaptive sensing, an energy-efficient topology configuration method for environment monitoring using densely deployed wireless sensor networks. Adaptive sensing puts redundant nodes into passive mode as auxiliary nodes to be used later on, thereby extending the system lifetime. Sensor data is collected at powerful macronodes periodically and a low-order model is fitted to compute a prediction area for each sensor. This prediction area is used to measure the redundancy level of the sensors covered in it. The redundant nodes are put into passive mode by macronodes while keeping the distortion in the output low. We analyze the energy-distortion tradeoff in monitoring applications, introduce the adaptive sensing algorithm based on this analysis. We also include a performance study demonstrating the advantages of our approach based on simulation results.

关键词： Monitoring Wireless sensor networks Adaptive systems Algorithm design and analysis Energy efficiency Network topology Predictive models Power system modeling Area measurement Distortion measurement

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Stereopsis method for visually impaired to identify obstacles based on distance

Stereopsis method for visually impaired to identify obstacle...

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International conference on image and Graphics (ICIG)

作者： G. Balakrishnan G. Sainarayanan R. Nagarajan S. Yaacob AI Research Group School of Engineering and Information Technology Universiti Malaysia Sabah Malaysia

Identification of obstacles in the real time environment is idempotent for human blind to navigate freely without collision. This paper describes a methodology that is required to support the blind to discriminate obstacles based on their distance. The hardware part consists of a sunglass fitted with two mini cameras, laptop computer and stereo earphones. The two cameras capture the visual information infront of blind user. The captured images are then processed using the proposed methodology. The methodology includes image processing module, which isolate objects from the two camera images, and stereo vision module calculates distance through disparity. In the proposed algorithm disparity is obtained with less computation compared to conventional area based stereo correspondence method. Experimentations were conducted in indoor environment, and the results obtained are supportable.

关键词： Cameras Navigation Humans image converters Hardware Stereo vision Time of arrival estimation Acoustic sensors Frequency Pixel

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*** Development: *** SDK Supporting Native and Managed Code

引用

International conference on Advanced Computer Science Applications and Technologies (ACSAT)

作者： Takuya Saito Kenichi Mase Research Institute for Natural Hazards & Disaster Recovery Niigata University Niigata Japan Academic Assembly Niigata University Niigata Japan

*** is a remote-controlled quad-rotor helicopter that is operated by computer instruction. Because communications between *** and a computer are complex, it is difficult to program *** software. Existing software development kits (SDKs) reduce those complexities, however, SDKs have many limitations. They can be difficult to use because the structure is too complex to understand, or their extensibility is too minimal for making a multifunctional application. To address these problems, we developed the new *** SDK. The *** SDK supports managed code, and it enables creation of user application programs using C# and visual Basic. Moreover, because the proposed SDK includes code written in C++/CLI, it supports unmanaged code and enables direct access to native libraries. In addition, the *** SDK supports high-definition video data, image analysis by OpenCV, marker recognition by ARToolkit, and 3D object display by OpenGL. We measured the performance of our proposed SDK for processing video images and have verified its satisfactory performance.

关键词： Libraries visual BASIC image resolution Three-dimensional displays High definition video Face detection

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Global Gabor features for rotation invariant object classification

Global Gabor features for rotation invariant object classifi...

引用

IEEE International conference on Intelligent Computer Communication and processing (ICCP)

作者： Ioan Buciu Ioan Nafornita Ioannis Pitas Electronics Department Faculty of Electrical Engineering and Information Technology University of Oradea Romania Electronics and Communications Faculty Politehnica University of Timisoara Timisoara Romania Department of Informatics Aristotle University of Thessaloniki Thessaloniki Greece

ISBN: (纸本)9781424426737

The human visual system can rapidly and accurately recognize a large number of various objects in cluttered scenes under widely varying and difficult viewing conditions, such as illuminations changing, occlusion, scaling or rotation. One of the state-of-the-art feature extraction techniques used in image recognition and processing is based on the Gabor wavelet model. This paper deals with the application of the aforementioned model for object classification task with respect to the rotation issue. Three training sample sizes were applied to assess the methodpsilas performance. Experiments ran on the COIL-100 database show the robustness of the Gabor approach when globally applied to extract relevant discriminative features. The method out-performs other state-of-the-art techniques compared in the paper such as, principal component analysis (PCA) or linear discriminant analysis (LDA).

关键词： Gabor filters Feature extraction Training Principal component analysis Databases Object recognition Robustness

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Improving mesh-based motion compensation by using edge adaptive graph-based compensated wavelet lifting for medical data sets

Improving mesh-based motion compensation by using edge adapt...

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IEEE International conference on Acoustics, Speech and Signal processing

作者： Daniela Lanz Andre Kaup Multimedia Communications and Signal Processing Friedrich-Alexander-Universitat Erlangen-Nurnberg (FAU) Cauerstr. 7 91058 Germany

ISBN: (纸本)9781509041183

Medical applications like Computed Tomography (CT) or Magnetic Resonance Tomography (MRT) often require an efficient scalable representation of their huge output volumes in the further processing chain of medical routine. A downscaled version of such a signal can be obtained by using image and video coders based on wavelet transforms. The visual quality of the resulting lowpass band, which shall be used as a representative, can be improved by applying motion compensation methods during the transform. This paper presents a new approach of using the distorted edge lengths of a mesh-based compensated grid instead of the approximated intensity values of the underlying frame to perform a motion compensation. We will show that an edge adaptive graph-based compensation and its usage for compensated wavelet lifting improves the visual quality of the lowpass band by approximately 2.5 dB compared to the traditional mesh-based compensation, while the additional filesize required for coding the motion information doesn't change.

关键词： Discrete Wavelet Transforms Motion Compensation Scalability Signal processing on Graphs Computed Tomography Motion compensation discrete wavelet transform Scalability X-Ray Computed Tomography compensated wavelets video coder lift lifts Edge of a figure or solid

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Spread spectrum watermarking for real images: Is everything so hopeless?

Spread spectrum watermarking for real images: Is everything ...

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European Signal processing conference (EUSIPCO)

作者： O. Koval S. Voloshynovskiy F. Pérez-González F. Deguillaume T. Pun University of Geneva - CUI Geneva 4 Switzerland Signal Theory and Communications Department University of Vigo Vigo Spain

In this paper we perform the capacity analysis of known-host-statitistics watermarking methods based on spread spectrum (SS) under Additive Wight Gaussian noise (AWGN) attack. The reason of our research is based on the paradox that being non-effective in theory SS-based practical watermarking systems outperform known-host-state methods when a commonly accepted benchmarking strategy (Stirmark benchmark) is used. We show that the gap in capacity of SS-based techniques with respect to quantization-based techniques at high WNR regime could be significantly reduced, if the embedding scenario is designed using a proper stochastic model of the host image at the encoder. We show how the practical solution of watermark power allocation problem relates to the optimal one. In particular, we model the host image as an Autoregressive Process of the first order (AR(1)) and show the results of power allocation based on the water-pouring principle. It is pointed out that water-mark spectrum in a real system that is properly shaped using Contrast Sensitivity Function (CSF) well-approximates the water-pouring solution. Finally, we perform several tests to analyze the modified SS capacity facing AWGN attack. Experimental results show that host interference in this case is significantly weakened, which leads to a noticeable capacity improvement.

关键词： Watermarking Abstracts Benchmark testing

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Machine Vision-based Tool Location and Wear Monitoring in Micro turning: Optical Setup and image processing Approaches

Machine Vision-based Tool Location and Wear Monitoring in Mi...

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Innovations in communications, Electrical and Computer Engineering (ICICEC), International conference on

作者： Shalupriya M K.P. Indira Department of Electronics and Communication Engineering Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Saveetha University Chennai India Department of Nanobiomaterials Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Saveetha University Chennai India

ISBN: (数字)9798350376517

ISBN: (纸本)9798350376524

In micro turning, tool placement, wear, and breakage are crucial as they affect precision and surface finish. Flank wear is problematic since it impacts dimensional accuracy, and current methods that rely on CNC encoder inputs and radius compensation are insufficient for micro turning due to the small tool sizes involved. Detecting flank wear in micro turning is difficult as the tools are often too small for visual inspection, making monitoring at micron levels a challenge. This research investigates using machine vision to monitor tool position and flank wear in micro turning. The optical system, comprising a 12X super zoom lens and 3MP CMOS image sensor, is assessed alongside three lighting techniques: direct, indirect, and backlighting. Preliminary image analysis, using Gaussian filters and histogram equalization, indicates lighting's importance. Early results, comparing new and worn tools using exclusive operators, are promising, but further image enhancements are necessary for accurate classification and wear detection.

关键词： Optical filters Integrated optics visualization Technological innovation Accuracy Lighting Turning Optical imaging Optical sensors Monitoring

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visual techniques applied to the ATV/1SS rendezvous monitoring

Visual techniques applied to the ATV/1SS rendezvous monitori...

引用

IEEE conference on Aerospace

作者： G. Casonato G.B. Palmerini Scuola di Ingegneria Aerospaziale Università degli Studi di Roma La Sapienza Rome Italy

The proposed paper deals with an automatic trajectory monitoring system designed for the rendezvous between the automatic transfer vehicle (ATV) and the Iautononternational Space Station (ISS). During final approach phase, a TV camera on the ISS currently provides images of ATV visual targets to be used by ISS crew for visual monitoring. The proposed monitoring system, based on a dedicated image-processing algorithm applied to these TV images of the approach, is intended to autonomously and automatically determine relative ATV-ISS position and attitude. Artificial intelligence techniques for edge detection, Hough transform and pattern matching are used to implement a recognition algorithm, able to fast and accurately indicate ATV visual targets position and orientation with respect to ISS. Those values are then processed in order to calculate the full set of relative ATV navigation data. Finally, an estimation of the relative trajectory evolution via a classical astrodynamic tool as the Euler-Hill relative motion equations follows, enabling the crew and the control centre to verify that trajectory corridors and attitude constraints are respected. According to ATV mission constraints, which require using existing sensors (i.e. ATV visual cues and ISS TV camera), the performances and the accuracy of the monitoring system are evaluated for significant approach cases. Overall, computation time and hardware requirements of the proposed system easily fall into the limits foreseen for a real-time on-board application. Both the ATV Control Centre (real-time GNC data check against telemetry) and the ISS (automatic monitoring tool for ISS crew) could take advantages of the output data provided by this system. Moreover, obtained results clearly show that the monitoring system is a suitable candidate for further developments and improvements aimed to provide a complete support tool for ATV mission operations during final approach phase.

关键词： HDTV Computerized monitoring TV Cameras Real time systems Space vehicles Space stations Position measurement Artificial intelligence image edge detection

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Highly scalable video coding by bidirectional predict-update 3-band schemes

Highly scalable video coding by bidirectional predict-update...

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International conference on Acoustics, Speech, and Signal processing (ICASSP)

作者： C. Tillier B. Pesquet-Popescu M. van der Schaar Signal and Image Proc. Department Télécom Paris Technology Paris France Department of Electrical and Computer Engineering University of California슠Davis Davis CA USA

Motion-compensated temporal filtering is an essential ingredient of recently developed wavelet-based scalable video coding schemes. The lifting implementation of these decompositions represents a versatile tool for spatio-temporal optimizations and numerous improvements have thus been proposed. An additional feature has been introduced lately by providing a 3-band lifting temporal decomposition, allowing non-dyadic scalability factors. The paper presents a motion-compensated scheme which is the 3-band equivalent of the 5/3 temporal filterbank. The proposed structure does not enter the classical lifting framework and therefore its invertibility is studied. Simulation results show higher coding efficiency, improved visual quality and more flexibility compared to the previously introduced Haar-like 2 or 3-band schemes.

关键词： Video coding Scalability Filter bank Filtering Spatial resolution Motion estimation Signal resolution Wavelet transforms Entropy coding Spatiotemporal phenomena

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Efficient processing of color image sequences using a color-aware instruction set on mobile systems

Efficient processing of color image sequences using a color-...

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International conference on Application Specific Systems (ASAP), Architectures and Processors

作者： Jongmyon Kim D.S. Wills Microelectronics Research Center School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

Application-specific extensions of a processor provide an efficient mechanism that meets the growing performance and power demands of portable embedded applications such as interactive multimedia communications. This work investigates the use of both the luminance and chrominance components in color image- and video-processing applications and proposes a color-aware instruction set extension (CAX) that improves the performance of color multimedia-processing applications. The CAX ISA is able to exploit a new level of subword parallelism not reachable by current multimedia extensions. Unlike typical multimedia extensions (e.g., Intel MMX, MIPS MDMX, and AMD 3DNow!), CAX instructions support parallel operations on two-packed 16-bit (6:5:5) YCbCr color pixels in a 32-bit datapath width and obtain substantial performance and code density improvements through direct support for color data processing rather than depending solely on generic subword parallelism. The results on a set of media benchmark applications indicate that the CAX versions achieve a speedup ranging from 3x to 5.8x while reducing energy consumption from 68% to 83% over the baseline versions on an identically-configured, dynamically-scheduled superscalar processor. The CAX versions also outperform the MDMX (MIPS multimedia extension) performance.

关键词： Color Parallel processing Motion estimation Computational complexity Multimedia systems Mobile computing Microelectronics Computer aided instruction Embedded computing Portable computers

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