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检索条件"主题词=Detection and tracking algorithms"

共 1721 条记录，以下是1511-1520 订阅

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REAL-TIME ASSOCIATIVE RECOGNIZING SYSTEM FOR BINARY PATTERNS 3

REAL-TIME ASSOCIATIVE RECOGNIZING SYSTEM FOR BINARY PATTERNS

引用

3RD ANNUAL INTERNATIONAL CONF ON APPLICATIONS OF ARTIFICIAL NEURAL NETWORKS

作者： CHEN, LL LIN, L WANG, RL Shanghai Institute of Technical Physics (China)

ISBN: (纸本)0819408743

This presentation describes the real-time associative recognizing system based on neural network technology for distortion-invariant pattern recognition. The system consists of two cascaded parts, i.e., an improved MADALINE invariant net with local connecting structure, and a feed-forward layered net of probabilistic logic neuron (PLN). The simple learning algorithm is proposed for the system. General-purpose RAMs are major parts of the system so that real-time processing is available.

关键词： Binary data Artificial neural networks detection and tracking algorithms Logic Neural networks Neurons Distortion invariant pattern recognition Evolutionary algorithms Multilayers Physics

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COMPUTER-BASED EVALUATION OF CAMOUFLAGE

COMPUTER-BASED EVALUATION OF CAMOUFLAGE

引用

CONF ON CHARACTERIZATION PROPAGATION, SIMULATION OF SOURCES AND BACKGROUNDS 2

作者： KILIAN, JC HEPFINGER, L Creative Optics Inc. (United States) U.S. Army Natick Reserch Development and Engineering Ctr. (United States)

ISBN: (纸本)0819408522

An application of image analysis techniques for construction of a field-portable, computer- based system for evaluation of personal camouflage is presented. The scope of evaluation is limited to target acquisition reduction performance of camouflaged uniforms against the unaided human visual system. Evaluation of camouflage with this system is based on a set of features for each component in the CIELAB color space that includes statistical texture measures, and first-order descriptive statistics over specified regions in a scene as functions of orientation and scale. The approaches taken for data acquisition, reduction, processing and evaluation are presented. An analysis of camouflage data relative to a human panel test is also presented.

关键词： Camouflage detection and tracking algorithms Data acquisition Reflectivity Cameras Image analysis Visual system Computing systems Statistical analysis Target acquisition

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ADVANCED SURVEILLANCE TESTBED AND BACKGROUND MODELING

ADVANCED SURVEILLANCE TESTBED AND BACKGROUND MODELING

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4TH CONF ON THE SIGNAL AND DATA PROCESSING OF SMALL TARGETS 1992

作者： SINGKOFER, KA MCCARTHY, JE ROBBINS, HM General Research Corp. (United States)

ISBN: (纸本)0819408638

The advanced surveillance testbed was developed to provide high-fidelity simulation of space- based electro-optical sensors, their associated signal processing, and multi-target tracking algorithms as well as the testing/evaluation of the algorithms. It has a modular design for ease of expansion and maintenance. The testbed begins with scenario definition which includes the definition of satellite constellations, specification of targets, the modeling of atmospheres, and the selection or generation of background scenes. Existing sensor modules include an advanced staring sensor, two linear scanners of advanced design, and a simplified generic sensor for quick simulations having lower fidelity. Modules for two-dimensional (monocular) tracking include a highly specialized tracker for use with the staring sensor and several two- dimensional trackers that can use angle-intensity data from any source. Results of two or more monocular simulations can be combined as inputs to algorithms for data fusion and three- dimensional tracking. `Optimal' two- and three-dimensional tracking algorithms are also provided. Additional modules provide overall control, graphics, and track analysis. This presentation discusses the testbed and its capabilities describing the models with emphasis placed on the background modeling and the implications of background and the lessons learned.

关键词： Clouds Sensors Electro optical modeling detection and tracking algorithms Scattering Signal processing Databases Atmospheric modeling Data modeling Surveillance

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AUTOMATIC ACQUISITION AND tracking OF ROUNDS AND TARGETS FOR ELECTROOPTIC FIRE-CONTROL

AUTOMATIC ACQUISITION AND TRACKING OF ROUNDS AND TARGETS FOR...

引用

4TH CONF ON THE SIGNAL AND DATA PROCESSING OF SMALL TARGETS 1992

作者： ROBERTS, G BRADFORD, L Loral Aeronutronic (United States)

A use of automatic acquisition and tracking for electro-optic fire control is described. The techniques used for detection of targets and rounds are described. Additionally test results obtained during Navy testing ar... 详细信息

ISBN: (纸本)0819408638

关键词： Target detection detection and tracking algorithms Forward looking infrared Target acquisition Unmanned aerial vehicles Automatic tracking CCD cameras Video Data processing Signal processing

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DATA ASSOCIATION FOR TRACK INITIATION AND EXTENSION USING MULTISCAN WINDOWS

DATA ASSOCIATION FOR TRACK INITIATION AND EXTENSION USING MU...

引用

4TH CONF ON THE SIGNAL AND DATA PROCESSING OF SMALL TARGETS 1992

作者： POORE, AB RIJAVEC, N BARKER, TN Colorado State Univ. (United States) IBM Corp./FSD (United States)

ISBN: (纸本)0819408638

The central problem in multitarget-multisensor tracking is the data association problem of partitioning the observations into tracks and false alarms so that an accurate estimate of the true tracks can be recovered. Many previous and current methodologies are based on single scan processing, which is real-time, but often leads to a large number of partial and incorrect assignments, and thus incorrect track identification. The fundamental difficulty with this approach is that there is simply not enough information in single scan processing to properly partition the observations into tracks and false alarms. In this work we formulate the problem of data association for track initiation and extension using multiscan windows in order to obtain superior track identification. A model problem is investigated to show the effect of window size, probability of detection, probability of false alarms, and measurement error on solution quality and timings.

关键词： Data processing Signal processing Sensors detection and tracking algorithms System identification Gadolinium Target detection Algorithm development Dynamical systems Optimization (mathematics)

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MULTIPLE HYPOTHESIS tracking algorithms FOR MASSIVELY PARALLEL COMPUTERS

MULTIPLE HYPOTHESIS TRACKING ALGORITHMS FOR MASSIVELY PARALL...

引用

4TH CONF ON THE SIGNAL AND DATA PROCESSING OF SMALL TARGETS 1992

作者： ALLEN, TG ALPHATECH Inc. (United States)

ISBN: (纸本)0819408638

Many large, complex target tracking scenarios, such as full-scale strategic missile attacks or low-observable tactical engagements, require both advanced algorithms and state-of-the-art parallel processing to produce accurate, timely results. In this paper, approaches for implementing multiple object, multiple hypothesis tracking algorithms on a massively parallel computer are presented and evaluated. Multiple hypothesis tracking algorithms offer improved performance over more traditional approaches, albeit at the expense of increased processing and storage requirements. Massively parallel array processors can deliver this needed computational power, assuming the algorithms can be efficiently mapped onto this restrictive class of architectures. algorithms are described here for all the functions within the multiple hypothesis approach. These algorithms are then benchmarked using the distributed array of processors (DAP) series from Active Memory Technology, Inc. Results of these benchmarks show that the multiple hypothesis tracking algorithms can be successfully implemented on array processors, displaying processing times that increase sublinearly with the number of objects under surveillance.

关键词： detection and tracking algorithms Signal processing Data processing Sensors Array processing Algorithm development Databases Computer architecture Missiles Surveillance

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CONFIDENCE RANGE ESTIMATE OF EXTENDED SOURCE IMAGERY ACQUISITION algorithms VIA COMPUTER-SIMULATIONS

CONFIDENCE RANGE ESTIMATE OF EXTENDED SOURCE IMAGERY ACQUISI...

引用

4TH CONF ON FREE-SPACE LASER COMMUNICATION TECHNOLOGIES

作者： CHEN, CC HUI, E OKAMOTO, G Jet Propulsion Lab. (United States)

ISBN: (纸本)081940781X

Spatial acquisition using the sun-lit Earth as a beacon source provides several advantages over active beacon-based systems for deep-space optical communication systems. However, since the angular extend of the Earth image is large compared to the laser beam divergence, the acquisition subsystem must be capable of resolving the image to derive the proper pointing orientation. The algorithms used must be capable of deducing the receiver location given the blurring introduced by the imaging optics and the large Earth albedo fluctuation. Furthermore, because of the complexity of modelling the Earth and the tracking algorithms, an accurate estimate of the algorithm accuracy can only be made via simulation using realistic Earth images. An image simulator was constructed for this purpose, and the results of the simulation runs are reported.

关键词： Clouds detection and tracking algorithms Receivers Space operations Algorithm development Computer simulations Edge detection Telecommunications Quantization Optical communications

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BUILDING REPRESENTATIONS FOR THE ENVIRONMENT OF A MOBILE ROBOT FROM IMAGE DATA 6

BUILDING REPRESENTATIONS FOR THE ENVIRONMENT OF A MOBILE ROB...

引用

CONF ON MOBILE ROBOTS 6

作者： TAYLOR, CJ Yale Univ. (United States)

ISBN: (纸本)081940750X

This paper presents an alternative approach to building representations for the environment of a mobile robot. This approach is based on recording the geometrical relationships between the observed features rather than their absolute position with respect to an arbitrary coordinate frame of reference. The resulting representation takes the form of a graph where the nodes represent the observed features and the edges represent the relationships between the features. This representation is particularly well suited for recognition tasks which can be reformulated as graph matching problems. Unlike Cartesian maps, relational maps can be built and maintained without any estimates for the position of the robot which means that the errors in this representation will be independent of any errors in the estimates for the robot position.

关键词： Mobile robots Error analysis Cameras Filtering (signal processing) detection and tracking algorithms Sensors Computed tomography Data centers Robotics Ultrasonics

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ACHIEVING SAFE AUTONOMOUS LANDINGS ON MARS USING VISION-BASED APPROACHES

ACHIEVING SAFE AUTONOMOUS LANDINGS ON MARS USING VISION-BASE...

引用

2ND CONF ON COOPERATIVE INTELLIGENT ROBOTICS IN SPACE

作者： PIEN, H Charles Stark Draper Lab. Inc. (United States)

ISBN: (纸本)0819407496

Autonomous landing capabilities will be critical to the success of planetary exploration missions, and in particular to the exploration of Mars. Past studies have indicated that the probability of failure associated with open-loop landings is unacceptably high. Two approaches to achieving autonomous landings with higher probabilities of success are currently under analysis. If a landing site has been certified as hazard free, then navigational aids can be used to facilitate a precision landing. When only limited surface knowledge is available and landing areas cannot be certified as hazard free, then a hazard detection and avoidance approach can be used, in which the vehicle selects hazard free landing sites in real-time during its descent. Issues pertinent to both approaches, including sensors and algorithms, are presented. Preliminary results indicate that one promising approach to achieving high accuracy precision landing is to correlate optical images of the terrain acquired during the terminal descent phase with a reference image. For hazard detection scenarios, a sensor suite comprised of a passive intensity sensor and a laser ranging sensor appears promising as a means of achieving robust landings.

关键词： Sensors Image sensors Image processing Mars detection and tracking algorithms Robotics Ranging Space robots Interfaces Hazard analysis

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ACQUISITION, POINTING AND tracking PERFORMANCE OF THE HUBBLE SPACE TELESCOPE FINE GUIDANCE SENSORS

ACQUISITION, POINTING AND TRACKING PERFORMANCE OF THE HUBBLE...

引用

6TH CONF ON ACQUISITION, tracking, AND POINTING

作者： EATON, DJ ABRAMOWICZREED, L Hughes Danbury Optical Systems Inc. (United States)

ISBN: (纸本)081940862X

The three Fine Guidance Sensors (FGS's) on board the Hubble Space Telescope have been operated extensively since the observatory was launched in April, 1990. The FGS's, each capable of measuring angle as small as 0.003 arc-seconds (15 nanoradians), provide required fine pointing information to the Space Telescope's pointing control system, and are intended to serve as astrometry instruments. On-orbit data have shown that the acquisition, pointing and tracking performance of the FGS's in most cases meets, and of these sometimes exceeds, requirements. The versatility of the FGS digital control electronics to adapt to the unexpected conditions imposed on the sensors by the telescope spherical aberration and by solar panel jitter will be discussed. There is encouragement from both on-orbit tests and analytical studies that the FGS's can accommodate the current telescope characteristics. Improvements to guide star acquisitions within the FGS's and to target acquisitions within science instruments have been accomplished with the internal distortion calibration of each FGS and with the alignment calibration between sensors. Techniques used in the calibration process and the resulting improvements in acquisitions will be presented.

关键词： Calibration Stars Distortion Telescopes Sensors Space telescopes Servomechanisms detection and tracking algorithms Monochromatic aberrations Solar cells

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