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Update on active chem-bio sensing

Update on active chem-bio sensing

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Conference on Chemical and Biological Sensing VI

作者： Swim, C Vanderbeek, R Emge, D Wong, A USA Edgewood Chem Biol Ctr Aberdeen Proving Ground MD 21010 USA

ISBN: (纸本)0819457809

The US Army Edgewood Chemical Biological Center (ECBC) is the leader in development of military systems for chemical and biological defense, in collaboration with all Services, other Government laboratories, academia, and industry. Chemical and biological optical sensing principles, unique capabilities, state-of-the-art sensors, and emerging technologies will be discussed. In order to acquire highly quantified data, study the effects of variables such as particle size distribution on backscatter coefficients, perform iterative aerosol algorithm development, and characterize breadboards, a novel "windowless" Vortex Chamber utilizing air curtains was developed and built at ECBC. The chamber has been successfully shown to contain a cloud of known size, concentration, and particle size distribution for 10-15 minutes. Near-term plans are focused on characterization of breadboards for standoff bio discrimination and deducing absolute backscatter coefficients from Vortex Chamber data.

关键词： Industrial chemicals Sensors Aerosols algorithm development Atmospheric particles LIDAR Nanoimprint lithography Chemical analysis Active remote sensing Biological and chemical sensing

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Media delivery and media service overlays

Media delivery and media service overlays

引用

Conference on Image and Video Communications and Processing 2005

作者： Wee, S HP Labs Multimedia Commun & Networking Dept Palo Alto CA USA

ISBN: (纸本)0819456586

Multimedia communication and streaming media services will become mainstream network infrastructure applications in the coming decade. However, there are many challenges that must be overcome. These challenges include the Internet's limited ability to handle real-time, low-latency media streams, the need for media security, and an uncertainty of the killer app. The nature of these challenges lends itself to enabling technology innovations in the media delivery and media processing space. Specifically, we envision an overlay infrastructure that supports networked media services that couple media delivery with in-network media processing. The media overlay should be programmable to allow rapid deployment of new applications and services and manageable so as to support the evolving requirements of the resulting usage models. Furthermore, the media overlay should allow for the delivery of protected media content for applications that have security requirements. A properly architected infrastructure can enable real-time multimedia communication and streaming media services in light of the inherent challenges.

关键词： Network security algorithm development Multimedia Network architectures Statistical analysis Video Computer security Scalable video coding Control systems Internet

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Coping with local geometric attacks by means of optic-flow-based resynchronization for robust watermarking

Coping with local geometric attacks by means of optic-flow-b...

引用

Conference on Security, Steganography and Watermarking of Multimedia Contents VII

作者： Caldelli, R De Rosa, A Becarelli, R Barni, M Univ Florence Dipartiemento Elettr & Telecomun Florence Italy

ISBN: (纸本)0819456543

In the last years digital watermarking has been widely indicated as a possible efficient toot to deal with multimedia copyright protection. Particularly, in the field of image watermaking, a large number or techniques has been developed aiming at hiding information within the data. After an initial phase in which the main problem was to succeed in inserting a private code which was unperceivable, successively watermarking community tried to design watermarks which presented a high level of robustness that meant the ability to be revealed also when the image had undergone different manipulations (e.g. compression, D/A-A/D conversion, filtering). Although good results have been obtained in this field, resilience against geometric manipulations, (e.g. rotation, scaling. changes of aspect ratio) is still a research issue;, furthermore robustness against Stirmark random-displacements attack in which small local geometric modifications are carried out, is still a crucial point for the majority of the so-called robust algorithms. In this paper a new approach. based on the estimation through an optic flow technique of the displacement field, correspondent to a specific geometric transformation, is proposed. This methodology can be adopted as a re-synchronization tool, to enhance robustness of digital image watermarking techniques.

关键词： Digital watermarking Signal detection Image filtering Distortion Image compression Optical flow Geometrical optics Image processing algorithm development Multimedia

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Registration techniques for speckle suppression in 2-D LADAR image sequences

Registration techniques for speckle suppression in 2-D LADAR...

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Conference on Image Processing - algorithms and Systems IV

作者： Sabo, MD Cain, S USAF Inst Technol Wright Patterson AFB OH 45433 USA

ISBN: (纸本)0819456454

Air Force Research Labs, Sensors Directorate has constructed and tested a coherent imaging system. The Laservision coherent imaging system resolution goals arc compatible with long range target identification based on the image characteristics of the target. The system received reflected coherent light from the laser using an optical telescope, which fed a CCD detector to collect the scene intensity. Registration of individual images remains a significant problem in the generation of accurate images collected using coherent imaging systems. An investigation of the performance of an image registration algorithm was conducted using dates collected from a, coherent optical imaging. The algorithm under study was implemented on a general-purpose computer running the MATLAB simulation environment. This paper documents the performance of the proposed technique compared to that of the cross-correlation algorithm.

关键词： Image registration Imaging systems Signal to noise ratio Speckle Detection and tracking algorithms LIDAR Computer simulations algorithm development Coherence imaging Laser systems engineering

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Segmentation of hand radiographs by using multi-level connected active appearance models

Segmentation of hand radiographs by using multi-level connec...

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Medical Imaging 2005 Conference

作者： Kauffman, JA Slump, CH Moens, HJB Univ Twente Signals & Syst Grp Fac Elect Engn Math & Comp Sci NL-7500 AE Enschede Netherlands

ISBN: (纸本)0819457213

Robust and accurate segmentation methods are important for the computerized evaluation of medical images. For treatment of rheumatoid arthritis, joint damage assessment in radiographs of hands is frequently used for monitoring disease progression. Current clinical scoring methods are based on visual measurements that are time-consuming and subject to intra and inter-reader variance. A solution may be found in the development of partially automated assessment procedures. This requires reliable segmentation algorithms. Our work demonstrates a se-mentation method based on multiple connected active appearance models (AAM) with multiple search steps using different quality levels. The quality level can be regulated by setting the image resolution and the number of landmarks in the AAMs. We performed experiments using two models of different quality levels for shape and texture information. Both models included AAMs for the carpal region, the metacarpals, and all phalanges. By starting an iterative search with the faster, low-quality model, we were able to determine the initial parameters of the second, high-quality model. After the second search, the results showed successful segmentation for 22 of 30 test images. For these images, 70% of the landmarks were found within 1.3 mm difference from manual placement by an expert. The multi-level search approach resulted in a reduction of 50% in calculation time compared to a search using a single model. Results are expected to improve when the model is refined by increasing the number of training examples and the resolution of the models.

关键词： Image segmentation Bone Radiography 3D modeling Image processing algorithms and systems Image resolution algorithm development Data modeling Image processing Medical imaging

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Fast prototyping of an FPGA-based high level image coprocessor using Handel-C

Fast prototyping of an FPGA-based high level image coprocess...

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Opto-Ireland 2005 Conference

作者： Benkrid, K Sukhsawas, S Belkacemi, S Queens Univ Belfast Sch Comp Sci Belfast BT7 1NN Antrim North Ireland

ISBN: (纸本)0819458082

FPGA technology enjoys both the high performance of a dedicated hardware solution and the flexibility of software that is offered by its inherent reprogrammability feature. Image Processing is one application area that can benefit greatly from FPGAs performance and flexibility. This paper presents the design and implementation of a high-level reconfigurable image coprocessor on FPGAs using the Handel-C hardware language. The latter allows non hardware specialists to program FPGAs at a high level using a C-like syntax, albeit with hardware architectures in mind. It hence allows for rapid development of FPGA applications. This is illustrated in this paper in the case of an image coprocessor whose instruction set is based on the operators of Image Algebra. Central to this instruction set are the five core neighbourhood operations of Image Algebra: Convolution, Additive Maximum, Additive Minimum, Multiplicative Maximum and Multiplicative Minimum. These are parameterised in terms of the neighbourhood operation's window coefficients, window size and image size. Handel-C language was used to design the Image Coprocessor with a fully tested prototype on Celoxica Virtex-E based RC1000-PP PCI board. The paper presents an overview of the approach used to generate FPGA architectures dynamically for the Image Coprocessor using Handel-C, as well as a sample of implementation results.

关键词： Field programmable gate arrays Image processing Prototyping Convolution Clocks Computer programming algorithm development Computer programming languages Computer science Software engineering

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Improved bang-bang control for a new type of piezoelectric friction damper

Improved bang-bang control for a new type of piezoelectric f...

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Smart Structures and Materials 2005 Conference

作者： Li, HN Li, J Song, G Dalian Univ Technol Dept Civil Engn Dalian 116024 Peoples R China

ISBN: (纸本)0819457418

This paper presents a new design of piezoelectric friction damper, which consists of tube piezoceramic stack actuators, load cells, preload bolts, brass sheets, spring washers and slotted bolted connection. A semi-active control strategy for variable friction dampers based on an improved suboptimal Bang-Bang control algorithm presented in this paper is also developed. By using genetic algorithm, the amplitudes of the control and preloading friction forces in the control system are obtained for enhancing the seismic performance of the controlled structures. The proposed approach is applied to a three-story building with a variable friction damper installed in the first story. The numerical results indicate that more reduction of the peak accelerations under seismic excitations and a better adaptability can be achieved than those of the unmodified controller.

关键词： Actuators Control systems Earthquakes Civil engineering Wind energy algorithm development Genetic algorithms Signal processing Switches Switching

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Army model and simulation science and technology investment plan

Army model and simulation science and technology investment ...

引用

Conference on Enabling Technologies for Simulation Science IX

作者： Murphy, WS Foreman, J Hartley, DS Sciarretta, AA Starr, SH Youngren, MA Alion Sci & Technol Arlington VA 22202 USA

ISBN: (纸本)0819457906

Achieving the goal of collaboration and synchronization of efforts across the total systems life cycle will require the Army to integrate and harmonize acquisition, training, testing and analytical modeling and simulation (M&S) capabilities in an unprecedented manner. A prerequisite to achieving the desired level of synchronization is the requirement to complete a technology needs assessment that identifies, characterizes, assesses, and prioritizes M&S Science and Technology (S&T) needs that are traceable to recognized Army needs. The Battle Command, Simulation and Experimentation (BCSE) Directorate in the Army's Office of the Deputy Chief of Staff, G-3/5/7 has taken the initiative to complete a series of technology assessments and is creating a corresponding series of focus area centric Army M&S S&T Investment Plans to guide investments and to impact institutional processes external to the G-3/5/7. This paper describes the Army M&S S&T Investment Plan creation process for the Battle Command focus area.

关键词： Data modeling Defense and security Analytical research Data conversion Data storage Standards development algorithm development Information technology On-screen displays Systems modeling

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Error resilient video coding using virtual reference picture

Error resilient video coding using virtual reference picture

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Conference on Image and Video Communications and Processing 2005

作者： Zhang, GJ Stevenson, RL Univ Notre Dame Dept Elect Engn Notre Dame IN 46556 USA

ISBN: (纸本)0819456586

Due to widely used motion-compensated prediction coding, errors propagate along decoded video sequence and may result in severe quality degradation. Various methods have been reported to address this problem based on the common idea of diversifying prediction references. In this paper, we present an alternative way of concealing the references pictures errors. A generated virtual picture is used as a reference instead of an actual sequence picture in the temporal prediction. The virtual reference picture is generated in a way to filter damaged parts of previously decoded pictures so that the decoder can still get a clean reference picture in case of errors. Coding efficiency is effected due to the fact that the virtual reference is less correlated to the currently encoded picture. The simulations on H.264 codec have shown quality improvement of the proposed method over intra-coded macroblock refreshment. It can be used on any motion-compensated video codec to combat channel errors.

关键词： Video coding Video Computer programming Nonlinear filtering Error analysis Digital filtering Motion estimation algorithm development Image quality Visualization

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Unattended sparse acoustic array configurations and beamforming algorithms

Unattended sparse acoustic array configurations and beamform...

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Conference on Unattended Ground Sensor Technologies and Applications VII

作者： Azimi-Sadjadi, MR Pezeshki, A Scharf, LL Wichern, G Informat Syst Technol Inc Ft Collins CO 80521 USA

ISBN: (纸本)0819457817

Various sparse array configurations have been studied to improve spatial resolution for separating several closely spaced targets in tight formations using unattended acoustic arrays. To extend the array aperture, it is customary to employ sparse array configurations with uniform inter-array spacing wider than the half-wavelength intra-subarray spacing;hence achieving more accurate direction of arrival (DOA) estimates without using extra hardware. However, this larger inter-array positioning results in ambiguous DOA estimates. To resolve this ambiguity, sparse arrays with multiple invariance properties could be deployed. Alternatively, one can design regular or random sparse array configurations that provide frequency diversity, in which case every subarray is designed for a particular band of frequencies. These different configurations are investigated in this paper. Additionally, we present a Capon DOA algorithm that exploits the specific geometry of each array configuration. Simulation results are presented to study the pros and cons of different sparse configurations.

关键词： Phased arrays Sensors Acoustics Near field Matrices Interference (communication) Spatial resolution algorithm development Detection and tracking algorithms Modulation

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