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An adaptive meshless method for spectrally resolved bioluminescence tomography

An adaptive meshless method for spectrally resolved biolumin...

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IEEE International conference on Image processing

作者： Chenghu Qin Jie Tian Xin Yang Kai Liu Jinchao Feng Guorui Yan Shouping Zhu Min Xu Medical Image Processing Group Institute of Automation Chinese Academy and Sciences Beijing China

As a novel optical molecular imaging technology, bioluminescence tomography (BLT) has become a research focus which can localize and quantify an internal light source with the bioluminescent signal on the external surface of a small animal. However, BLT is ill-posed because of complex photon propagation in the biological tissue and noisy boundary measured data. Moreover, the disadvantage of the finite element method (FEM) commonly used in BLT is emerged gradually due to the troublesome mesh discretization. therefore, an adaptive meshless method is presented to perform a quantitative reconstruction of the bioluminescent source for spectrally resolved BLT in this contribution, which not only can reduce the ill-posedness of BLT effectively through the application of multi-spectral information but also can avoid the time-consuming mesh generation. In addition, the reconstruction can be largely improved using adaptive technology based on a posteriori error estimation. Finally, the performance of this method is evaluated by numerical simulation experiments.

关键词： Bioluminescence Tomography Image reconstruction signal resolution Biomedical optical imaging Molecular imaging Focusing Light sources Animals Optical propagation

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A 64 channels 14-bit 50 MS/sec data acquisition card with real time processing in VME form factor

A 64 channels 14-bit 50 MS/sec data acquisition card with re...

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IEEE NPSS conference on Real Time

作者： J.-P. Martin C. Mercier N. Starinsky Laboratoire René J. A. Lévesque Université de Montreal Montreal QUE Canada

A 64 channels digitizer card has been designed for the readout of auxiliary detectors at the TRIUMF ISACII TIGRESS facility. the card has been optimized for the readout of silicon strip detectors and scintillator arrays. However, it is general enough in functionality to be adaptable for most applications. Each channel consist of a 50 MS/sec 14-bit ADC with LVDS serial output (at 700 MHZ). the high density of the card is made possible by the use of small footprint octal ADC chips. Groups of 4 octal ADC's have their fast serial outputs connected to Altera Stratix FPGA'S that read out the data streams and perform the required real time processing of the digitized signals. For the silicon detector application, the processing is essentially to apply pole-zero compensation, perform the digital filtering of the preamplifiers pulse shapes, evaluate the charge, and calculate a time stamp. the module is laid out in the standard VME 6U 4HP format, and consists of two types of assemblies: a VME carrier board that contains a data assembler, general services and I/O interfaces, and two mezzanines that contain the ADC's and the signal processing FPGA's. the module can be accessed through the VME bus, but also has a fast CAT6 serial LVDS serial communication link compatible with the TIGRESS readout system.

关键词： data acquisition Detectors Silicon Field programmable gate arrays signal processing Assembly Sensor arrays Performance evaluation Digital filters Filtering

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Stability considerations in a new interface circuit for inductive position sensors

Stability considerations in a new interface circuit for indu...

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IEEE International conference on Electronics, Circuits and Systems (ICECS)

作者： Mohammad Reza Nabavi Stoyan Nihtianov Electronic Instrumentation Laboratory Delft University of Technnology Delft Netherlands

ISBN: (纸本)9781424450909;9781424450916

A stable electronic interface circuit for sensing small inductances is discussed in this paper. the main application is for interfacing eddy current displacement sensors. the proposed circuit has been designed and implemented in a 0.35 ¿m BiCMOS process. the frequency of the excitation signal is above 22 MHz, which eliminates the skin effect on the measurement result when using very thin targets. Oscillation stability issues along with an offset cancellation approach for the interface circuit are particularly taken into account. In this design the full-scale displacement range is 1.5 mm. Primary experimental results show that the signal to noise ratio is about 75 dB, with 240 ¿s measurement time and only 9.5 mW power dissipation.

关键词： Circuit stability Eddy currents BiCMOS integrated circuits Skin effect Frequency measurement signal to noise ratio Power measurement Noise measurement Time measurement Power dissipation

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ATCA control system hardware for the plasma vertical stabilization in the JET tokamak

ATCA control system hardware for the plasma vertical stabili...

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IEEE NPSS conference on Real Time

作者： A. J. N. Batista A. Neto M. Correia A. M. Fernandes B. B. Carvalho J. C. Fortunato J. Sousa C. A. F. Varandas F. Sartori M. Jennison Instituto de Plasmas e Fusão Nuclear Associacão Euratom/IST Lisboa Portugal Culham Science Centre Association UKAEA/Euratom Abingdon Oxfordshire UK

A multi-input-multi-output controller for the plasma vertical stabilization was implemented and installed on the Joint European Torus Tokamak. the system can attain a control-cycle time of approximately 30 mus using times86 multi-core processors but targets 10 mus via field programmable gate array (FPGA) based processing. the hardware, complying with the advanced telecommunications computing architecture (ATCA) standard, was in-house designed and implemented to achieve the required performance and consists of: a total of 6 synchronized ATCA control boards, each one with 32 analog input channels which provide up to 192 galvanically-isolated channels, used mainly for magnetic measurements. Each board contains an FPGA, which performs digital signal processing and includes a PCI express communications interface; an ATCA rear transition module, which comprises up to 8 galvanically-isolated analog output channels to control the fast radial field amplifier (plusmn10 kV, plusmn2.5 kA). An optical link to digitally control the enhanced radial field amplifier (plusmn12 kV, plusmn5 kA). Up to 8 EIA-485 digital inputs for timing and monitoring information; An ATCA processor blade with a quad-core processor, where the control algorithm is presently running, connected to the 6 ATCA control boards through the PCI express interface. All FPGAs are interconnected by low-latency links via the ATCA full-mesh backplane, allowing all channel data to be available on each FPGA running an upcoming distributed control algorithm.

关键词： Control systems Hardware Plasmas Tokamaks Field programmable gate arrays Telecommunication control Communication system control Galvanizing Optical amplifiers signal processing algorithms

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Regularized dictionary learning for sparse approximation

Regularized dictionary learning for sparse approximation

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16th European signal processing conference, EUSIPCO 2008

作者： Yaghoobi, M. Blumensath, T. Davies, M. Institute for Digital Communications Joint Research Institute for Signal and Image Processing University of Edinburgh United Kingdom

Sparse signal models approximate signals using a small number of elements from a large set of vectors, called a dictionary. the success of such methods relies on the dictionary fitting the signal structure. therefore, the dictionary has to be designed to fit the signal class of interest. this paper uses a general formulation that allows the dictionary to be learned form the data with some a priori information about the dictionary. In this formulation a universal cost function is proposed and practical algorithms are presented to minimize this cost under different constraints on the dictionary. the proposed methods are compared with previous approaches using synthetic and real data. Simulations highlight the advantages of the proposed methods over other currently available dictionary learning strategies. copyright by EURASIP.

关键词： Cost functions

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A flexible architecture for DSP applications combining high performance arithmetic with small scale configurability

A flexible architecture for DSP applications combining high ...

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16th European signal processing conference, EUSIPCO 2008

作者： Xydis, Sotiris Sideris, Isidoros Economakos, George Pekmestzi, Kiamal School of Electrical and Computer Engineering National Technical University of Athens Athens 15773 Greece

this paper presents the architecture of a flexible and high performance unit for DSP applications. the proposed architecture operates based on fast Carry-Save (CS) arithmetic. A mapping methodology, for datapaths composed with the proposed flexible units, is also presented. It exploits the incorporated features of the proposed units and enables fast computations, high operation densities and advanced data reusability. Experimental results shown that several DSP algorithms can be mapped onto the proposed architecture with high efficiency delivering in average, latency gains of 36.56% and 45.76% compared to the MAC and the primitive resources based datapaths, respectively. copyright by EURASIP.

关键词： Reusability

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Target detection by distributed sensors: distributed sensor concept-DISCO for small target detection

Target detection by distributed sensors: distributed sensor ...

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20th conference on signal and data processing of small targets

作者： Rafailov, Michael K. QinetiQ NA Reston VA 20191 USA

ISBN: (纸本)9780819471604

Distributed Sensor Concept - DISCO was proposed [I] for multiplication of individual sensor capabilities through non-coherent cooperative target engagement. the signal processing technique for DISCO is Recursive Adaptive Frame Integration of Limited data - RAFIL technique [2] that was initially proposed as a way to improve the SNR [3], reduce data rate [4] and mitigate FPA noise for IR sensors [5]. In DISCO, the RAFIL technique is used in a segmented way, when constituencies of the technique are spatially and temporally separated between individual sensors. Each sensor provides to and receives data from other sensors in the network. In this paper efficiency of DISCO is discussed for acquisition, accurate handover and track correlation of small targets.

关键词： multiple sensor system distributed sensors distributed apertures accurate target detection frame integration data rate recursive processing double threshold

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Robust scale invariant small target detection using the Laplacian scale-space theory

Robust scale invariant small target detection using the Lapl...

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20th conference on signal and data processing of small targets

作者： Kim, Sungho Yang, Yukyung Lee, Joohyoung Park, Yongchan Agcy Defense Dev Taejon 305600 South Korea

ISBN: (纸本)9780819471604

this paper presents a new small target detection method using scale invariant feature. Detecting small targets whose sizes are varying is very important to automatic target detection in infrared search and track (IRST). the conventional spatial filtering methods with fixed sized kernel show limited target detection performance for incoming targets. the scale invariant target detection can be defined as searching for maxima in the 3D (x, y, and scale) representation of an image with the Laplacian function. the scale invariant feature can detect different sizes of targets robustly. Experimental results with real FUR images show higher detection rate and lower false alarm rate than conventional methods. Furthermore, the proposed method shows very low false alarms in scan-based IR images than conventional filters.

关键词： small target robust detection varying size scale invariant scale-space

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Detection of small objects in multi-layered infrared images

Detection of small objects in multi-layered infrared images

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20th conference on signal and data processing of small targets

作者： Wang, Jing Bao, Shangqi Ralph, Jason F. Goulermas, John Y. Univ Liverpool Dept Elect Engn & Elect Liverpool L69 3GJ Merseyside England

ISBN: (纸本)9780819471604

this paper uses super-resolution methods to detect small objects in infrared image sequences from a simulated airborne platform, using image registration techniques for automatic sightline stabilisation. the scene consists of multiple layers, corresponding to a static background scene and layers of cloud cover at varying heights. the motivation is to evaluate the performance of super-resolution methods in the presence of three-dimensional structured infrared clutter.

关键词： object detection super-resolution automatic sightline stabilisation infrared imagery clouds

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small object hyperspectral detection from a low-flying UAV

Small object hyperspectral detection from a low-flying UAV

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20th conference on signal and data processing of small targets

作者： Murray-Krezan, J. Neumann, J. G. Leathers, R. A. USN Res Lab Washington DC 20375 USA

ISBN: (纸本)9780819471604

small object detection with a low false alarm rate remains a challenge for automated hyperspectral detection algorithms when the background environment is cluttered. In order to approach this problem we are developing a compact hyperspectral sensor that can be fielded from a small unmanned airborne platform. this platform is capable of flying low and slow, facilitating the collection of hyperspectral imagery that has a small ground-sample distance (GSD) and small atmospheric distortion. Using high-resolution hyperspectral imagery we simulate various ranges between the sensor and the objects of interest. this numerical study aids in analysis of the effects of stand-off distance on detection versus false alarm rates when using standard hyperspectral detection algorithms. Preliminary experimental evidence supports our simulation results.

关键词： hyperspectral HSI GSD small object detection

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