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SCALE-INVARIANT SHAPE REPRESENTATION BASED ON THE WAVELET TRANSFORM 3

SCALE-INVARIANT SHAPE REPRESENTATION BASED ON THE WAVELET TR...

引用

conference on signal processing, Sensor Fusion, and Target Recognition III

作者： YOON, SH ALExANDER, WE KIM, JH N CAROLINA STATE UNIV DEPT ECERALEIGHNC 27695

ISBN: (纸本)0819415367

Matching of occluded objects is a difficult problem. Moreover, the problem is more difficult when scale-invariant matching is needed. A scale invariant representation is essential for this application. In this paper, we propose using the wavelet transform of a boundary to obtain a scale-invariant representation. We use the cubic B-spline as a smoothing function of the wavelet transform since the B-spline is analytically well defined and simple to implement. We implement the fast continuous wavelet transform by using a dyadic wavelet decomposition and dilated B-splines. As a result of using the wavelet transform, we obtain boundaries at various scales while using a small number of data points. The existing scale-space image approaches are not effective for occluded object matching since they use a normalized x-axis and too many data points. We propose a new scale-invariant representation similar to the scale-space image. The representation is generated by locating zero-crossings of the curvature function of boundaries at only the scales where the number of zero-crossings is changing. We scale the x-axis for each scale instead of using the same normalization for all scales. The proposed representation is scale-invariant and appropriate for scale-invariant matching with occlusion.

关键词： Wavelet transforms Continuous wavelet transforms wavelets

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A HIGHLY-EFFICIENT MONOLITHIC VARACTOR MULTIPLIER FOR 77 GHZ COLLISION-AVOIDANCE RADAR applications

A HIGHLY-EFFICIENT MONOLITHIC VARACTOR MULTIPLIER FOR 77 GHZ...

引用

International conference on Millimeter and Submillimeter Waves and applications

作者： BORELLI, J MCDERMOTT, G ALPHA IND INC METHUENMA 01844

ISBN: (纸本)0819415588

A GaAs monolithic varactor multiplier has been developed for collision avoidance radars with a conversion efficiency of 31% @ 76.5 GHz when driven by 25dBm @ 38.25 GHz. This corresponds to nearly 20dBm (100mW) of output power at W-band. We believe this to be the best performance reported to date for a diode-based monolithic multiplier at this output frequency.

关键词： Collision avoidance Diodes Radar image processing Capacitance Capacitors signal attenuation Gallium arsenide Semiconducting wafers Transceivers

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IMPLEMENTATION OF OMEGA-K SYNTHETIC-APERTURE RADAR IMAGING ALGORITHM ON A MASSIVELY-PARALLEL SUPERCOMPUTER

IMPLEMENTATION OF OMEGA-K SYNTHETIC-APERTURE RADAR IMAGING A...

引用

conference on Algorithms for Synthetic Aperture Radar imagery

作者： YERKES, C WEBSTER, E USN COMMAND CTR CONTROL & OCEAN SURVEILLANCEDIV RES DEV TEST & EVALUATSAN DIEGOCA

ISBN: (纸本)0819415340

Advanced algorithms for synthetic aperture radar (SAR) imaging have in the past required computing capabilities only available from high performance special purpose hardware. Such architectures have tended to have short life cycles with respect to development expense. Current generation Massively Parallel Processors (MPP) are offering high performance capabilities necessary for such applications with both a scalable architecture and a longer projected life cycle. In this paper we explore issues associated with implementation of a SAR imaging algorithm on a mesh configured MPP architecture.

关键词： Synthetic aperture radar image processing Radar Radar imaging image acquisition Data communications Digital signal processing image compression Parallel computing signal processing

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EVALUATION OF THE MLANS applications TO NONCOOPERATIVE IFF 3

EVALUATION OF THE MLANS APPLICATIONS TO NONCOOPERATIVE IFF

引用

conference on signal processing, Sensor Fusion, and Target Recognition III

作者： CHERNICK, J PERLOVSKY, LI TYE, D USA MAT SYST ANAL ACTIVABERDEEN PROVING GROUNDMD 21010

ISBN: (纸本)0819415367

This paper describes applications of Maximum Likelihood Adaptive Neural System (MLANS) to the characterization of clutter in IR images and to the identification of targets. The characterization of image clutter is needed to improve target detection and to enhance the ability to compare performance of different algorithms using diverse imagery data. Enhanced unambiguous IFF is important for fratricide reduction while automatic cueing and targeting is becoming an ever increasing part of operations. We utilized MLANS which is a parametric neural network that combines optimal statistical techniques with a model-based approach. This paper shows that MLANS outperforms classical classifiers, the quadratic classifier and the nearest neighbor classifier, because on the one hand it is not limited to the usual Gaussian distribution assumption and can adapt in real time to the image clutter distribution;on the other hand MLANS learns from fewer samples and is more robust than the nearest neighbor classifiers. Future research will address uncooperative IFF using fused IR and MMW data. © 1994 SPIE. All rights reserved.

关键词： Maximum likelihood

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UNSUPERVISED image CHARACTERIZATION FOR REAL-TIME applications

UNSUPERVISED IMAGE CHARACTERIZATION FOR REAL-TIME APPLICATIO...

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conference on signal processing, Sensor Fusion, and Target Recognition III

作者： SOOD, CK SITA, D IYER, KSC INST ARMAMENT TECHNOL FAC GUIDED MISSILEIMAGE PROC & VIS LABPOONA 411025INDIA

ISBN: (纸本)0819415367

Automatic target recognition makes it possible to provide weapons with lock-on-after-launch (LOAL) capability. For such applications, characterization of digital images for real-time application is required. One method for this has been partially achieved using a modification of Karhunen-Loueve transformation. This technique makes unsupervised lower-dimensional characterization feasible, so as to be able to locate sensor position in a digital image.

关键词： Automatic target recognition Sensors Weapons

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DESIGN OF A HIGH-RESOLUTION PROGRAMMABLE DIGITAL CAMERA

DESIGN OF A HIGH-RESOLUTION PROGRAMMABLE DIGITAL CAMERA

引用

conference on image Acquisition and Scientific Imaging Systems

作者： PONTIFEx, B POON, S JAGGI, B XILLIX TECHNOL CORP VANCOUVER V5Y 3Y3BCCANADA

ISBN: (纸本)0819414689

A digital camera has been designed based on a 1317 by 1035 pixel, full frame, CCD which offers the large area, high density sampling but with the options of programmable sub-area scanning and multiple independent x and y binning and programmable gain and offset. The sub-area scanning and binning can be used to increase the effective frame rate of the device for such applications as fast focusing and object location. The binning also provides greater sensitivity at the cost of spatial resolution, but is ideal in low light level applications such as fluorescence microscopy. The programmability of this camera permits the switching between the various clocking modes within a single frame time. Hence, the image can be auto-focused in sub-area scanning mode and then within a single frame time the full frame image can be acquired. The programmable clocking modes make this device ideal for quantitative imaging applications requiring a high throughput and the programmable gain and offset allow the user to fine tune the device for his specific needs. A description of the programmable microimager design and some initial measurements of noise, linearity, frequency response, and stability are presented.

关键词： Charge-coupled devices Interference (communication) Analog electronics Digital electronics Digital signal processing Cameras signal processing Digital cameras Optical testing Temperature metrology

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Oblique projections in discrete signal subspaces of l2 and the wavelet transform

Oblique projections in discrete signal subspaces of l2 and t...

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Wavelet applications in signal and image processing II

作者： Aldroubi, Akram Unser, Michael A. Natl. Inst.s of Health Bethesda MD USA

ISBN: (纸本)0819416274

We study the general problem of oblique projections in discrete shift-invariant spaces of l2 and we give error bounds on the approximation. We define the concept of discrete multiresolutions and wavelet spaces and show that the oblique projections on certain subclasses of discrete multiresolutions and their associated wavelet spaces can be obtained using perfect reconstruction filter banks. Therefore we obtain a discrete analog of the Cohen-Daubechies-Feauveau results on biorthogonal wavelets.

关键词： signal theory

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NONSEPARABLE ORTHOGONAL LINEAR PHASE PERFECT RECONSTRUCTION FILTER BANKS AND THEIR APPLICATION TO image COMPRESSION

NONSEPARABLE ORTHOGONAL LINEAR PHASE PERFECT RECONSTRUCTION ...

引用

1994 IEEE International conference on image processing (ICIP-94)

作者： VENKATARAMAN, S LEVY, BC UNIV CALIF DAVIS DEPT ELECT & COMP ENGNDAVISCA 95616

ISBN: (纸本)0818669527

We have designed a 4-channel 10x10 nonseparable orthogonal linear phase perfect reconstruction filter bank (PRFB), hereafter NSEP, and examined its performance in image compression applications. It is shown that, in addition to the orthogonality property, NSEP offers an excellent compression performance. Because of their limited spatial support, the nonseparable filters can be implemented at a reasonable computational cost. The orthogonality property also allows the use of image compression algorithms which exploit orthogonality for bit allocation purposes. We demonstrate that the NSEP filters have superior spatial localization properties when compared to filters arising in a 2-D separable PRFB generated from a l-D Daubechies FB of length 10. This superior spatial localization results in less visible ringing distortion in compressed images. In addition, the linear phase property of NSEP distributes the ripples located at image edges evenly on both sides of each edge, thus reducing further their visibility. Because of these advantages, NSEP is a viable and attractive candidate for high quality, low bit rate image compression applications. © 1994 IEEE.

关键词： image compression

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CONTOUR SIMPLIFICATION BY A NEW NONLINEAR FILTER FOR REGION-BASED CODING

CONTOUR SIMPLIFICATION BY A NEW NONLINEAR FILTER FOR REGION-...

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conference on Visual Communications and image processing 94

作者： GU, C KUNT, M SWISS FED INST TECHNOL SIGNAL PROC LABCH-1015 LAUSANNESWITZERLAND

ISBN: (纸本)081941638X

The guiding principle of this study is to find an optimum way to simplify the contours produced by a second generation coding scheme based on morphological segmentation. For this purpose, evaluations of existing methods for contour simplification are carried out first. Based on the human visual phenomenon, a new nonlinear filter by means of majority operation is designed to simplify the contours in order to obtain an optimum compromise between the cost for contour coding and visual quality. applications for region-based still image coding and video coding are demonstrated. Experimental results have shown an average of 20% reduction of bits for contour coding while keeping good visual quality.

关键词： image segmentation image compression Nonlinear filtering image filtering Visualization image processing algorithms and systems Mathematical morphology Video coding 3D image processing image quality

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PERFORMANCE MODELING AND MEASUREMENTS IN OPTICAL-image SYNTHESIS SYSTEMS

PERFORMANCE MODELING AND MEASUREMENTS IN OPTICAL-IMAGE SYNTH...

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6th conference on Advances in Optical Information processing

作者： LAFUSE, JL ROTH, PJ TURPIN, TM FEINLEIB, RE ESSEX CORP COLUMBIAMD 20146

Over the last four years, Essex Corporation has been developing an image reconstruction system (ImSynTM) for a variety of applications, including synthetic aperture radar, magnetic resonance imaging, and other sensors... 详细信息

ISBN: (纸本)081941544X

Over the last four years, Essex Corporation has been developing an image reconstruction system (ImSyn^TM) for a variety of applications, including synthetic aperture radar, magnetic resonance imaging, and other sensors. Each of these formats encompasses its own set of requirements for image quality, image size, and throughput. The ImSyn system has been designed to provide image dynamic range of up to 100 dB, arbitrary image sizes, and throughputs of 30 images per second to satisfy the various requirements. Recent efforts to enhance the ImSyn breadboard version has required the development of modeling techniques to measure system performance and identify sources of error and artifacts. The modeling approach, application of the measurements to determine and improve system performance, and the resulting imagery achieved with the ImSyn breadboard are presented.

关键词： Sensors Transform theory signal to noise ratio Performance modeling Fourier transforms image processing Synthetic aperture radar image quality Magnetic resonance imaging Spatial frequencies

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