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检索条件"任意字段=Conference on Advanced Signal Processing Algorithms"

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New signal adaptive approach for the reduction of interference terms in quadratic time-frequency distributions

New signal adaptive approach for the reduction of interferen...

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SPIE conference on advanced signal processing algorithms, Architectures, and Implementations VIII

作者： Nickel, RM Williams, WJ Univ Michigan Dept Elect Engn & Comp Sci Ann Arbor MI 48109 USA

ISBN: (纸本)0819429163

One of the key problems in high resolution (quadratic), time-varying spectral analysis is the suppression of interference terms which can obscure the true location of auto components in the resulting time-frequency distribution (TFD). Commonly used reduced interference distributions (RIDs) tackle the problem with a properly chosen two-dimensional low pass filter (kernel). A recently published(8) novel approach uses alternative means to achieve the desired goal. The idea of the new method is to obtain an estimate of the cross terms from a given prior distribution based on the magnitude and location of its negative components. The estimate is constructed via an iterative projection method that guarantees that the resulting distribution is positive and satisfies the marginals. Even though the marginals are usually a desirable property of TFDs in general, they can impose an undesirably strong constraint on positive TFDs in particular (Examples are given in this paper). For these cases it is thus beneficial to relax the marginals-constraint. In this paper we present a new method that does not require the incorporation of this constraint and thus leads to positive TFDs with reduced interference terms but without the restrictions due to the marginals.

关键词： positive time-frequency distributions cross-terms successive projections penalty functions

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Regularization of ill-posed problems using (symmetric) Cauchy-like preconditioners

Regularization of ill-posed problems using (symmetric) Cauch...

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SPIE conference on advanced signal processing algorithms, Architectures, and Implementations VIII

作者： Kilmer, ME Northeastern Univ Dept Elect & Comp Engn Boston MA 02115 USA

ISBN: (纸本)0819429163

In certain applications, the discretization of two-dimensional integral equations can lead to systems involving matrices with block Toeplitz-Toeplitz block structure. Iterative Krylov subspace methods are sometimes employed to find regularized solutions to the related 2D discrete ill-posed problems;however, preconditioners which filter noise are needed to speed convergence to regularized solutions. We describe a preconditioning technique based on the Toeplitz-type structure of the matrix which generalizes the approaches in [1] and [2] to take advantage of symmetry and real arithmetic operations. We use fast sine transforms to transform the original system to a system whose matrix has partially reconstructible Cauchy-like blocks. The preconditioner is a block diagonal, rank m approximation to this matrix, with Cauchy-like blocks each augmented by an identity of appropriate dimension. We note that the initialization cost is in general less than that for the similar 2D preconditioner in [2] which does not take advantage of symmetry. Several examples are given which illustrate the success of our preconditioned methods.

关键词： regularization Toeplitz Cauchy-like minimal residual image processing deblurring

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On second-order statistics-based blind equalization of FIR/IIR multiple-input multiple-output channels with common zeros

On second-order statistics-based blind equalization of FIR/I...

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SPIE conference on advanced signal processing algorithms, Architectures, and Implementations VIII

作者： Tugnait, JK Huang, B Auburn Univ Dept Elect Engn Auburn AL 36849 USA

ISBN: (纸本)0819429163

The problem of blind equalization of MIMO (multiple-input nultiple-output) communications channels is considered using the second-order statistics of the data. Such models arise when a single receiver data from multiple sources is fractionally sampled (assuming that there is excess bandwidth), or when an antenna array is used with or without fractional sampling. We focus on direct design of finite-length MMSE (minimum mean-square error) blind equalizers. We allow infinite impulse response (IIR) channels. Our approaches also work when the "subchannel" transfer functions have common zeros so long as the common zeros are minimum-phase zeros. We only require that the there exist a causal, stable left inverse (not necessarily unique) to the MIMO transfer function and that the leading coefficient matrix of the MIMO channel impulse response have its rank equal to the number of sources. The channel length or model orders need not be known. The sources are recovered up to a unitary mixing matrix and are further 'unmixed' using higher-order statistics of the data. An illustrative simulation example is provided.

关键词： spatio-temporal processing multiple-input multiple-output channels multiaccess systems blind equalization space diversity time diversity fractional sampling

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A Low-Cost Megapixel Digital Camera Using High-Performance In-Camera Image processing

A Low-Cost Megapixel Digital Camera Using High-Performance I...

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Final Program and Proceedings: IS and T's 51st Annual conference

作者： Dunsmore, Clay A. Mori, Nobuyuki Asami, Shuji Smith, Craig M. Eastman Kodak Company Rochester NY

Digital cameras are becoming more powerful and affordable with each product generation. This paper describes a new generation digital camera that optimizes image quality and ease of use. Excellent image quality is obtained by employing a megapixel CCD sensor and advanced image processing algorithms. A 1.8& color LCD and a new graphical user interface (GUI) guide the user through the operation of the camera. The camera has a 2X zoom lens, real image optical viewfinder, and a "camera like" industrial design. A host of "traditional" camera features are supported, including self-timer, five flash modes, macro mode, and exposure compensation. These features are augmented by digital camera features including preview (live viewfinder), instant image review, in-camera finished files (Exif/JPEG and FlashPix image formats) and video output. Significant digital signal processing power is required to implement the image processing algorithms and the GUI. A 60 MHz RISC processor with an on-board 16-bit DSP coprocessor provides all of the camera image and display processing functions. The image processing functions include color filter array interpolation, white balance, color and tone correction, edge enhancement, thumbnail image generation, JPEG image compression, and file formatting.

关键词： Cameras

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Sonar resolution-based environment mapping 15

Sonar resolution-based environment mapping

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15th IEEE International conference on Robotics and Automation, ICRA 1998

作者： Cahut, Leyla Vlavanis, Kimon P. Delic, Hakan Robotics and Automation Laboratory Center for and Advanced Computer Studies University of Southwestern Louisiana LafayetteLA70504 United States Signal and Image Processing Laboratory Department of Electrical Engineering BogaziCi University Bebek 80815 Istanbul Turkey

ISBN: (纸本)078034300X

Ultrasonic range sensors are used to obtain the information required for collision-free navigation of a mobile robot in a semi-structured or unstructured environment. A set of range readings from a ring of sonars are correlated to acquire a 2D map of the robot's environment. The map is continuously enhanced via novel matching and update algorithms as new data are collected while the robot is in motion. The algorithm utilizes confidence measures that are directly obtained from the sonar's resolution or accuracy. There are no additional modeling assumptions and the approach is robust. The algorithms are experimentally tested on the Nomad 200 mobile robot and Nomad's Cognos Software Development Package. © 1998 IEEE.

关键词： Software testing

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NeuroSeek dual-color image processing infrared focal plane array

NeuroSeek dual-color image processing infrared focal plane a...

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SPIE conference on Infrared Readout Electronics IV

作者： McCarley, PL Massie, MA Baxter, CR Huynh, BL USAF Res Lab MNGI Eglin AFB FL 32542 USA

ISBN: (纸本)0819428094

Several technologies have been developed in recent years to advance the state of the art of infrared sensor systems including dual color affordable focal planes, on-focal plane array biologically inspired image and signal processing techniques and spectral sensing techniques. Pacific advanced Technology (PAT) and the Air Force Research Lab Munitions Directorate have developed a system which incorporates the best of these capabilities into a single device. The "NeuroSeek" device integrates these technologies into an infrared focal plane array (FPA) which combines multicolor Midwave Infrared/Longwave Infrared (MWIR/LWIR) radiometric response with on-focal plane "smart" neuromorphic analog image processing. The Readout and processing Integrated Circuit (ROPIC) Very Large Scale Integration (VLSI) chip which was developed under this effort will be hybridized to a dual color detector array to produce the NeuroSeek FPA, which will have the capability to fuse multiple pixel-based sensor inputs directly on the focal plane (pixel based sensor fusion). Great advantages are afforded by application of massively parallel processing algorithms to image data in the analog domain;the high speed and low power consumption of this device mimic operations performed in the human retinal(1,2).

关键词： infrared focal plane array dual color smart FPA neuromorphic sensor fusion

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Development Of The Virtual Sound Algorithm

Development Of The Virtual Sound Algorithm

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IEEE International conference on Consumer Electronics (ICCE)

作者： Kawano Taira Matsudaira Abe Hypermedia Research Center Broadcasting Multimedia Department Advanced Audio Processing Laboratory SANYO Electric Company Limited Moriguchi Osaka Japan

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Performance evaluation of register allocator for the advanced DSP of TMS320C80

Performance evaluation of register allocator for the advance...

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

作者： Jihong Kim G. Short Department of Computer Science Seoul National University Seoul South Korea Texas Instrumenits Inc. Northampton UK

PPCA is an assembly language-level register allocator and instruction compactor for the advanced DSPs (ADSPs) of the TMS320C80 digital signal processor. It was developed to help the implementation of time-critical ADSP assembly programs which heavily utilize powerful ADSP features optimized for multimedia and image computing applications for maximum efficiency. PPCA takes as an input ADSP assembly operations with symbolic variables. It then allocates the ADSP's physical registers to the symbolic variables and rearranges the operations into a highly-parallelized compact format. In this paper, we have evaluated the performance of a register allocation capability of PPCA using an extensive image computing library for the TMS320C80. We present the basic algorithm of the PPCA's register allocation module and describe the performance evaluation approach used. The result shows that PPCA essentially achieves optimal register allocation for the test cases based on the image computing library functions.

关键词： Digital signal processing Registers Assembly Libraries Digital signal processors Time factors Multimedia computing Computer applications signal processing algorithms Testing

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QMotor 2.0-A PC based real-time multitasking graphical control environment

QMotor 2.0-A PC based real-time multitasking graphical contr...

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American Control conference (ACC)

作者： N. Costescu D. Dawson Department of Electrical and Computer Engineering Clemson University Clemson SC USA

This paper describes the motivation for as well as the design and implementation of a PC based system used to implement advanced control strategies without an embedded DSP board. This system is called QMotor 2.0. It takes advantage of modern CPU and real-time operating system technology to deliver a product which can concurrently execute a real-time control program on the same CPU as the graphical user interface and other tools.

关键词： Multitasking Digital signal processing Control systems Computer interfaces Workstations Mechatronics Central processing Unit Real time systems Graphical user interfaces signal processing algorithms

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GRYFFIN TALOS taut wire perimeter detection system

GRYFFIN TALOS taut wire perimeter detection system

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International Carnahan conference on Security Technology

作者： G. Hellard Australia

Perimeter security utilising a taut wire fence sensor system has been available for the last 30 years. There are a number of features which make such systems attractive for security applications. These include resistance to environmental affects, low nuisance alarm rate and high probability of detection. A taut wire fence constructed of barbed wire also acts as a deterrent, adding a barrier delay time to the perimeter. This paper describes a novel design for a new taut wire sensor. The mechanical design of the sensor provides a detector with superior sensitivity and robustness. The design allows for direct application of sensor wire strain through the sensor body without having to provide for a direction translation of sensor wire movement to the transducer. The electronic design of the sensor head stage provides advanced signal processing of the disturbance signal. The signal processing concept for a complete barrier is based on a distributed micro-controller design. Each sensor processor has an adaptive algorithm which customizes the signal processing of each sensor wire. Computer simulation testing using pre-logged environmental data is described.

关键词： Wire Mechanical sensors signal processing algorithms Adaptive signal processing Security signal design Sensor systems Immune system Added delay Delay effects

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