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检索条件"主题词=Algorithm development"

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Improved Evaluation of Geo-registration algorithms for Airborne EO/IR Imagery

Improved Evaluation of Geo-registration Algorithms for Airbo...

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Conference on Geospatial InfoFusion III

作者： Taylor, Clark N. Air Force Research Lab. (United States)

ISBN: (纸本)9780819495389

When EO/IR imagery is collected from an aerial platform, geo-registration (estimating the geo-detic coordinates of pixels within an image) is one of the key algorithms used for image and video exploitation. Unfortunately, the performance of geo-registration algorithms is difficult to evaluate due to variabilities in the quality and type of input data. In addition, previous evaluation approaches require large amounts of human intervention, leading to small amounts of quantitative data. We describe a new methodology and associated software used to evaluate and compare geo-registration algorithms in a more automated fashion. This methodology enables several thousand points to be tested as part of an evaluation. Results are presented on a study between several different geo-registration algorithms, demonstrating the utility of this new evaluation approach. Lessons learned on geo-registration performance are discussed.

关键词： Video Sensors Error analysis Cameras algorithm development Image sensors Image registration Unmanned aerial vehicles Video processing Roads

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Automated Cellular Pathology in Noninvasive Confocal Microscopy

Automated Cellular Pathology in Noninvasive Confocal Microsc...

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Conference on Optical Biopsy XII

作者： Ting, Monica Krueger, James Gareau, Daniel Rockefeller Univ Lab Invest Dermatol New York NY 10065 USA

ISBN: (纸本)9780819498533

A computer algorithm was developed to automatically identify and count melanocytes and keratinocytes in 3D reflectance confocal microscopy (RCM) images of the skin. Computerized pathology increases our understanding and enables prevention of superficial spreading melanoma (SSM). Machine learning involved looking at the images to measure the size of cells through a 2-D Fourier transform and developing an appropriate mask with the erf() function to model the cells. Implementation involved processing the images to identify cells whose image segments provided the least difference when subtracted from the mask. With further simplification of the algorithm, the program may be directly implemented on the RCM images to indicate the presence of keratinocytes in seconds and to quantify the keratinocytes size in the en face plane as a function of depth. Using this system, the algorithm can identify any irregularities in maturation and differentiation of keratinocytes, thereby signaling the possible presence of cancer.

关键词： Image segmentation Confocal microscopy Melanoma Skin Spatial frequencies algorithm development Fourier transforms Image processing algorithms and systems Reflectivity Pathology

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ARTIFICIAL-INTELLIGENCE SYSTEM FOR MOLECULAR-STRUCTURE ELUCIDATION USING INFRARED (IR) AND NUCLEAR-MAGNETIC-RESONANCE (NMR) SPECTRA 9

ARTIFICIAL-INTELLIGENCE SYSTEM FOR MOLECULAR-STRUCTURE ELUCI...

引用

9th International Conference on Fourier Transform Spectroscopy

作者： ELYASHBERG, M MARTIROSIAN, E ZLATINA, L KARASEV, Y ALL RUSSIA ORGAN SYNTH RES INST MOSCOW 107005RUSSIA

ISBN: (纸本)0819413607

The described system uses spectrum-structure correlations in IR and NMR spectra, which form a knowledge base of the system. Structural-group analysis of an unknown compound is carried out, then all structural formulas (SF) of isomers are generated and checked for correspondence to the experimental data. Selection of the most probable SF is made by predicting spectral characteristics of all possible structures. The predictive ability of IR absorption curve computation for selecting the preferable SF has been studied as applied to cycloalkanes. For any SF, the program can generate and depict all stereoisomers and build automatically their spatial models.

关键词： Molecules Artificial intelligence Infrared radiation Intelligence systems Magnetism Absorption 3D modeling algorithm development Bismuth Chemical species

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A 1.32 MICRON, LONG-RANGE, SOLID-STATE, IMAGING LADAR 2

A 1.32 MICRON, LONG-RANGE, SOLID-STATE, IMAGING LADAR

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CONF ON SENSORS AND SENSOR SYSTEMS FOR GUIDANCE AND NAVIGATION 2

作者： ANDRESSEN, CC Hercules Defense Electronics Systems Inc. (United States)

ISBN: (纸本)081940859X

The design of a newly designed ladar system (called LADAR) using a diode-pumped Q-switched Nd:YLF laser operating at 1.32 micron is described, and images obtained with the LADAR are presented together with the performance results of signal processing algorithms. It is shown that the system is able to obtain a range image of a target at 2 km, obtain intensity image information, and implement target detection and identification algorithms.

关键词： LIDAR Sensors Semiconductor lasers Electronics algorithm development Receivers Imaging systems Detection and tracking algorithms Eye Target detection

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SUPPORTING IMAGE ALGEBRA IN THE C++ LANGUAGE 4

SUPPORTING IMAGE ALGEBRA IN THE C++ LANGUAGE

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4TH CONF ON IMAGE ALGEBRA AND MORPHOLOGICAL IMAGE PROCESSING

作者： WILSON, JN Univ. of Florida (United States)

ISBN: (纸本)0819412791

Image algebra has been implemented in a variety of programming languages designed specifically to support the development of image processing and computer vision programs. Our current work involves the implementation of a class library, iac++, that supports image algebra programming in C++. The paper discusses the relation of the iac++ class library to previous implementations of image algebra. The paper assumes a rudimentary knowledge of C++ and object oriented programming, but reviews the concepts critical to explanation of image algebra implementation issues. The image algebra is implemented by a group of C++ classes providing objects corresponding to points in n-dimensional Real And Integer Cartesian product spaces, homogeneous sets of points over these spaces, images over those point sets, and templates mapping points into images. Both point sets and images can comprise objects that are represented as data structures--the more common view--or as functions--which introduces a variety of capabilities unavailable with the data structure view. The paper also introduces the use of iterator classes for processing all elements of a point set or all pixels in an image or template.

关键词： C++ Image storage Image processing Computer programming Computer vision technology Machine vision algorithm development Space operations Computer programming languages Software

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Consistent detection and identification of individuals in a large camera network

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Conference on Unmanned/Unattended Sensors and Sensor Networks IV

作者： Colombo, Alberto Leung, Valerie Orwell, James Velastin, Sergio A. Kingston Univ. (United Kingdom)

ISBN: (纸本)9780819468949

In the wake of an increasing number of terrorist attacks, counter-terrorism measures are now a main focus of many research programmes. An important issue for the police is the ability to track individuals and groups reliably through underground stations, and in the case of post-event analysis, to be able to ascertain whether specific individuals have been at the station previously. While there exist many motion detection and tracking algorithms, the reliable deployment of them in a large network is still ongoing research. Specifically, to track individuals through multiple views, on multiple levels and between levels, consistent detection and labelling of individuals is crucial. In view of these issues, we have developed a change detection algorithm to work reliably in the presence of periodic movements, e.g. escalators and scrolling advertisements, as well as a content-based retrieval technique for identification. The change detection technique automatically extracts periodically varying elements in the scene using Fourier analysis, and constructs a Markov model for the process. Training is performed online, and no manual intervention is required, making this system suitable for deployment in large networks. Experiments on real data shows significant improvement over existing techniques. The content-based retrieval technique uses MPEG-7 descriptors to identify individuals. Given the environment under which the system operates, i.e. at relatively low resolution, this approach is suitable for short timescales. For longer timescales, other forms of identification such as gait, or if the resolution allows, face recognition, will be required.

关键词： Cameras Video Video surveillance Detection and tracking algorithms Calibration Process modeling RGB color model Data modeling Surveillance algorithm development

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MAXIMUM-LIKELIHOOD METHOD FOR PROBABILISTIC MULTI-HYPOTHESIS TRACKING

MAXIMUM-LIKELIHOOD METHOD FOR PROBABILISTIC MULTI-HYPOTHESIS...

引用

Conference on Signal and Data Processing of Small Targets 1994

作者： STREIT, RL LUGINBUHL, TE USN CTR UNDERSEA WARFARE CTRDIV NEWPORTNEWPORTRI 02841

ISBN: (纸本)0819415391

In a multi-target multi-measurement environment, knowledge of the measurement-to-track assignments is typically unavailable to the tracking algorithm. In this paper, a strictly probabilistic approach to the measurement-to-track assignment problem is taken. Measurements are not assigned to tracks as in traditional multi-hypothesis tracking (MHT) algorithms; instead, the probability that each measurement belongs to each track is estimated using a maximum likelihood algorithm derived by the method of Expectation-Maximization. These measurement-to-track probability estimates are intrinsic to the multi-target tracker called the probabilistic multi-hypothesis tracking (PMHT) algorithm. Unlike MHT algorithms, the PMHT algorithm does not maintain explicit hypothesis lists. The PMHT algorithm is computationally practical because it requires neither enumeration of measurement-to-track assignments nor pruning.

关键词： Detection and tracking algorithms Silicon Expectation maximization algorithms algorithm development Error analysis Process modeling Filtering (signal processing) algorithms Environmental sensing Information operations

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OPTICAL CORRELATOR TECHNIQUES APPLIED TO ROBOTIC VISION 3

OPTICAL CORRELATOR TECHNIQUES APPLIED TO ROBOTIC VISION

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CONF ON OPTICAL INFORMATION PROCESSING SYSTEMS AND ARCHITECTURES 3

作者： HINE, BP REID, MB DOWNIE, JD NASA/Ames Research Ctr. (United States)

ISBN: (纸本)0819406929

Vision processing is one of the most computationally intensive tasks required of an autonomous robot. The data flow from a single typical imaging sensor is roughly 60 Mbits/sec, which can easily overload current on-board processors. Optical correlator-based processing can be used to perform many of the functions required of a general robotic vision system, such as object recognition, tracking, and orientation determination, and can perform these functions fast enough to keep pace with the incoming sensor data. We describe a hybrid digital electronic/analog optical robotic vision processing system developed at Ames Research Center to test concepts and algorithms for autonomous construction, inspection, and maintenance of space-based habitats. We discuss the system architecture design and implementation, its performance characteristics, and our future plans. In particular, we compare the performance of the system to a more conventional all digital electronic system developed concurrently. The hybrid system consistently outperforms the digital electronic one in both speed and robustness.

关键词： Optical correlators Databases Optical filters Image filtering Optical signal processing Robotic systems Digital electronics Robot vision Spatial light modulators algorithm development

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Ultrahigh resolution optical coherence tomography for quantitative topographic mapping of retinal and intraretinal architectural morphology

Ultrahigh resolution optical coherence tomography for quanti...

引用

Conference on Coherence Domain Optical Methods in Biomedical Science and Clinical Applications VI

作者： Ko, T Hartl, I Drexler, W Ghanta, R Fujimoto, J MIT Elect Res Lab Dept Elect Engn & Comp Sci Cambridge MA 02139 USA

ISBN: (纸本)0819443581

Quantitative, three-dimensional mapping of retinal architectural morphology was achieved using an ultrahigh resolution ophthalmic OCT system. This OCT system utilizes a broad bandwidth titanium-sapphire laser light source generating bandwidths of up to 300 nm near 800 nm center wavelength. The system enables real-time cross-sectional imaging of the retina with similar to3 mum axial resolution. The macula and the papillomacular axis of a normal human subject were systematically mapped using a series of linear scans. Edge detection and segmentation algorithms were developed to quantify retinal and intraretinal thicknesses. Topographic mapping of the total retinal thickness and the total ganglion cell/inner plexiform layer thickness was achieved around the macula. A topographic mapping quantifying the progressive thickening of the nerve fiber layer (NFL) nasally approaching the optic disk was also demonstrated. The ability to create three-dimensional topographic mapping of retinal architectural morphology at similar to3 mum axial resolution will be relevant for the diagnosis of many retinal diseases. The topographic quantification of these structures can serve as a powerful tool for developing algorithms and clinical scanning protocols for the screening and staging of ophthalmic diseases such as glaucoma.

关键词： Optical coherence tomography Macula Image resolution Nerve algorithm development Optical discs Retina Human subjects Imaging systems Light sources

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An Iterative Model-Based Cogging Compensator for the Green Bank Telescope Servo System 5

An Iterative Model-Based Cogging Compensator for the Green B...

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Conference on Ground-Based and Airborne Telescopes V

作者： Franke, Timothy Weadon, Tim Ford, John Garcia-sanz, Mario Case Western Reserve Univ Dept Comp Sci & Elect Engn Cleveland OH 44106 USA Natl Radio Astron Observ Green Bank WV USA

ISBN: (纸本)9780819496133

This paper outlines an anti-cogging methodology and summarizes the current state of motor cogging cancellation on the Green Bank Telescope (GBT). An iterative, model-based algorithm is developed for finding the anti-cogging signal which yields rapid convergence. This method fills a gap in present methodologies in that it can serve as a drop-in cogging solution which operates in the presence of unknown structural dynamics as well as with an existing feedback controller. The algorithm is described and demonstrated on a 40 HP DC brushed motor test bed and also on the GBT's elevation axis motors. Results and implementation experience from deploying the algorithm on a motor test bed and on the GBT are discussed.

关键词： Telescopes Data modeling Feedback control Servomechanisms Control systems Model-based design Structural dynamics Actinium algorithm development System identification

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