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检索条件"主题词=Algorithm Development"

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SYMMETRY-BASED IMAGE SEGMENTATION

SYMMETRY-BASED IMAGE SEGMENTATION

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Conference on Video Communications and PACS for Medical Applications

作者： CICCONI, P KUNT, M EPFL ECUBLENS SIGNAL PROC LABCH-1015 LAUSANNESWITZERLAND

ISBN: (纸本)0819412236

In this work, we present a technique which suggests the use of symmetry to reduce the redundancy in images. A symmetry-based image segmentation and coding scheme is described. A segmentation technique is analyzed, and applied on natural images, performing their efficient partition. In order to find symmetries in regions of any shape, the concept of axes of symmetry is generalized to skeletons of symmetry, dividing the regions into two symmetric subparts by the introduction of the Medial Axis Transformation of the regions. Each subpart of the regions is then linearly predicted with respect to the skeletons. An efficient coding strategy specifying the shape and the luminance of the regions is described. Results on natural images show that the described technique outperforms the more classical second generation image coding methods in terms of visual quality.

关键词： Image segmentation Image compression Image quality Image processing algorithms and systems Visualization algorithm development Error analysis Quantization Image processing Spatial analysis

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CONCEPT-FORMATION USING ITERATE BUILDING RULE MODELS FOR EFFICIENT REASONING

CONCEPT-FORMATION USING ITERATE BUILDING RULE MODELS FOR EFF...

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CONF ON THE APPLICATIONS OF ARTIFICIAL INTELLIGENCE 1993 : KNOWLEDGE-BASED SYSTEMS IN AEROSPACE AND INDUSTRY ( PREPRINTS )

作者： BISWAS, G LEE, GS WEINBERG, JB Vanderbilt Univ. (United States)

ISBN: (纸本)081941199X

This paper discusses the application of a conceptual clustering algorithm called ITERATE to improve complex problem solving. More specifically, we apply the ITERATE system to build a hierarchy of rule models from sets of rules defined for PLAYMAKER, an expert system for characterizing hydrocarbon fields and plays in terms of their essential geological characteristics for the purposes of prospect analysis. PLAYMAKER is built on MIDST, an expert system shell that employs task-specific reasoning structures. The rule model hierarchy derived by ITERATE is then used with the task-specific reasoning structures to develop a more efficient and focused reasoning mechanism. A set of case studies were conducted to demonstrate the improved performance of the reasoning system.

关键词： Data modeling Artificial intelligence Oceanography Systems modeling algorithm development Copper Fine needle aspiration Performance modeling Coastal modeling Control systems

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High resolution anisoplanatic imaging from an airborne platform

High resolution anisoplanatic imaging from an airborne platf...

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Conference on Unconventional Imaging II

作者： Dayton, David Gonglewski, John Appl Technol Assoc 1300 Britt SE Albuquerque NM 87123 USA US Air Force Res Lab Kirtland AFB NM 87117 USA

ISBN: (纸本)0819463868

Unconventional computer aided imaging approaches, such as bi-spectrum or multi-frame blind deconvolution, have been used for some time to obtain high resolution images of space based objects from the ground. This "looking up" imaging scenario is characterized by r0 diameters usually much smaller than the telescope aperture, and isoplanatic angles on the same order as the object under observation. Air to ground imaging on the other hand, is often characterized by relatively large r0 values usually about the same size of the imaging aperture, but very small isoplanatic angles. In such a case, where the scene covers many isoplanatic patches, it has been shown that improvements in image quality can be obtained by dividing the field of view into sub-regions and applying processing algorithms to each sub-region. Because r0 is roughly the diameter of the aperture, the primary aberration over a sub-region is tip-tilt. Block matching algorithms that correct only the local tip-tilt over the sub-regions have been developed to run in near real time. Correcting higher order local aberrations, using a blind deconvolution algorithm, can lead to improved results but requires increased computation. In this presentation we seek to compare air-to-ground imagery with different levels of processing;first global tip-tilt only correction;second local tip-tilt correction;and finally local tip-tilt plus high order correction. The goal is to determine if the increased detail obtained at each step is worth in increased processing complexity.

关键词： Deconvolution algorithm development Image processing Point spread functions Detection and tracking algorithms Image resolution Space telescopes Optimization (mathematics) Telescopes Analytical research

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BAYES-OPTIMAL VISUALIZATION OF VECTOR-FIELDS 4

BAYES-OPTIMAL VISUALIZATION OF VECTOR-FIELDS

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CONF ON HUMAN VISION, VISUAL PROCESSING, AND DIGITAL DISPLAY 4

作者： BOESEL, RW BRESLER, Y Univ. of Illinois/Urbana-Champaign (United States)

This paper addresses the effective display of noisy vector-valued image data. A new game- theoretic model of a human observer in a visualization task is developed, and used to derive optimal algorithms for the display... 详细信息

ISBN: (纸本)0819411469

关键词： Visualization Image segmentation Image visualization Visual process modeling Image quality algorithm development Astatine Error analysis Magnetic resonance imaging Tissues

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Quantifying the perceived interest of objects in images: Effects of size, location, blur, and contrast

Quantifying the perceived interest of objects in images: Eff...

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Conference on Human Vision and Electronic Imaging XIII

作者： Kadiyala, Vamsi Pinneli, Srivani Larson, Eric C. Chandler, Damon M. Oklahoma State Univ Sch Elect & Comp Engn Image Coding & Anal Lab Stillwater OK 74078 USA

ISBN: (纸本)9780819469786

This paper present;, the results of two psychophysical experiments designed to investigate the effects of size, location, blur, and contrast on the perceived visual interest of objects within images. In the first experiment, digital composting was used to create images containing objects (humans, animals, and non-living objects) which varied in controlled increments of size, location, blur, and contrast. Ratings of perceived interest were then measured for each object. We found that: (1) As object size increases, perceived interest increases but exhibits diminished gains for larger sizes;(2) As an object moves from the center of the image toward the image's edge, perceived interest decreases nearly linearly with distance: (3) Blurring imposes a substantial initial decrease in perceived interest, but this drop is relatively lessened for highly blurred objects;(4) As an object's RMS contrast is increased, perceived interest increases nearly linearly. Furthermore, these trends were quite similar for all three categories (human, animal, non-living object). To determine whether these data can predict the perceived interest of objects in real, non-composited images, a second experiment was performed in which subjects rated the visual interest of each of 562 objects in 150 images. Based on these results, an algorithm is presented which, given a segmented image, attempts to generate an object-level interest map.

关键词： Image segmentation Image processing algorithms and systems Visualization algorithm development Lamps Databases Electronic imaging Gaussian filters Light sources and illumination Photometry

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DOCUMENT SKEW ANGLE DETECTION algorithm 2

DOCUMENT SKEW ANGLE DETECTION ALGORITHM

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CONF ON VISUAL INFORMATION PROCESSING 2

作者： LE, DX THOMA, GR National Library of Medicine (United States)

ISBN: (纸本)0819411973

As part of research into document image processing, an algorithm has been developed to detect the degree of skew in a scanned binary image. The principal components of the algorithm are component labelling, a procedure to reduce the amount of data to be processed, a technique to minimize the effect of non-textual data (graphics, forms, line art, large fonts, and dithered images) on the measurement of skew angle, and the Hough transform. The performance of the algorithm has been evaluated using a sample size of several hundred images of medical journal pages. Evaluation shows that a skew angle may be detected with an accuracy of about 0.50 degree.

关键词： Binary data Hough transforms Image processing Detection and tracking algorithms Image segmentation algorithm development Medical imaging Image processing algorithms and systems Visual information processing Data processing

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REMOTE-SENSING OF CLOUD FOR DEFENSE AND CLIMATE STUDIES - AN OVERVIEW

REMOTE-SENSING OF CLOUD FOR DEFENSE AND CLIMATE STUDIES - AN...

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CONF ON PASSIVE INFRARED REMOTE SENSING OF CLOUDS AND THE ATMOSPHERE

作者： ISAACS, RG Atmospheric and Environmental Research Inc. (United States)

ISBN: (纸本)0819411701

The determinations of cloud presence, properties, and radiative influence are high priority requirements for both defense related operations and in the pursuit of research goals for the U.S. Global Change Research Program. A number of current programs address aspects of the remote sensing of clouds; this paper provides an overview of these programs, their objectives, requirements, and interrelationship. Requirements are divided into three categories: (1) impacts on defense operations and systems, (2) numerical weather prediction (NWP), and (3) climate study objectives, both prognostic and diagnostic. Additionally, current satellite sensor data resources and applicable cloud property retrieval algorithm approaches are described.

关键词： Clouds Satellites Climatology Sensors Data modeling algorithm development Environmental sensing Databases Atmospheric modeling Visible radiation

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Comparison of output from ORASIS and Pixel Purity calculations.

Comparison of output from ORASIS and Pixel Purity calculatio...

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Conference on Imaging Spectrometry IV

作者： Bowles, J Daniel, M Grossmann, J Antoniades, J Baumback, M Palmadesso, P USN Res Lab Remote Sensing Div Washington DC 20375 USA

ISBN: (纸本)0819428930

We compare the results produced by the NRL ORASIS algorithm with those produced by ENVI's Pixel Purity Index (PPI). Both procedures attempt to find appropriate estimations of the constituent endmembers. In ENVI's PPI, each spectrum in the scene is given a pixel purity index according to the number of times (in a given set of trials) its projection to a random linear subspace is extreme. The spectra with sufficiently high index are then examined with ENVI's n-D Visualizer and endmembers are chosen by inspection. The endmembers thus obtained are averages of spectra in the scene. The ORASIS algorithm begins with a vector quantization procedure producing a list of distinct spectra referred to as exemplars. An altered Gram-Schmidt process is then applied to the exemplars to determine their dimensionality and initial estimates of the endmembers. This is followed by a shrink-wrap - the candidate endmembers are adjusted to form a simplex that best fits the data and thereby determines the final endmembers. The comparison is made on the output from two data cubes. Using the first 64 bands of the AVIRIS 1996 Florida Keys scene and the last 55 bands of the Cuprite scene, the outputs are similar. For all pure pixels with indexes above a certain threshold an exemplar exists that is either identically the same spectrum or within the ORASIS set error angle. Subsequently, the use of ENVI's n-D visualizer allows the viewing of clusters in the data, which allows the selection of endmembers.

关键词： Acquisition tracking and pointing Visualization Mathematical modeling Diamond Hyperspectral imaging Sensors algorithm development Analytical research Quantization Transform theory

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Pm10 retrieval over the water surface of penang straits from landsat TM5 data

Pm10 retrieval over the water surface of penang straits from...

引用

Conference on algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XIII

作者： Lim, H. S. MatJafri, M. Z. Abdullah, K. Saleh, N. Mohd. Hashim, S. A. Univ Sains Malaysia Sch Phys Minden 11800 Penang Malaysia

ISBN: (纸本)9780819466877

In this study, we used the Landsat TM data captured on 9 March 2006 for the retrieval of PM 10 over the water surface of Penang Straits, Malaysia. PM 10 measurements were collected using a handheld DustTrak (TM) meter simultaneously with the remotely sensed data acquisition. The PCI Geomatica version 9.1 digital image processing software was used in all image-processing analysis. An algorithm was developed based on the atmospheric optical characteristic. The digital numbers were extracted corresponding to the ground-truth locations for each band and then converted into radiance and reflectance values. The reflectance measured from the satellite [reflectance at the top of atmospheric, rho(TOA)] was subtracted by the amount given by the surface reflectance to obtain the atmospheric reflectance. Then the atmospheric reflectance was related to the PM10 using regression analysis. These atmospheric reflectance values were used for calibration of the PM10 algorithm. The developed algorithm was used to correlate the digital signal and the PM10 concentration. The proposed algorithm produced a high correlation coefficient (R) and low root-mean-square error (RMS). The PM10 concentration was generated using this algorithm over the water surface of Penang straits.

关键词： Reflectivity Atmospheric particles Earth observing sensors Landsat Satellites algorithm development Aerosols Atmospheric optics Molecules Calibration

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MORPHOLOGY-BASED algorithm FOR POINT TARGET DETECTION IN INFRARED BACKGROUNDS

MORPHOLOGY-BASED ALGORITHM FOR POINT TARGET DETECTION IN INF...

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5TH CONF ON SIGNAL AND DATA PROCESSING OF SMALL TARGETS

作者： TOM, VT PELI, T LEUNG, M BONDARYK, JE Atlantic Aerospace Electronics Corp. (United States)

ISBN: (纸本)0819411906

A morphology-based algorithm has been developed for point target detection in IRST applications. It exhibits comparable detection and false alarm performance to a median filter. The morphology-based algorithm has an efficient computational paradigm based on combinations of simple nonlinear grayscale operations, which makes it ideally suited to real- time, high data rate IRST applications. A detection filter based on morphological background estimation exhibits spatial high-pass characteristics emphasizing target-like peaks in the data and suppressing all other clutter. Example cases are presented which point out the detection performance differences between the morphological and median approaches. Overall performance results were generated in the form of ROC curves for cloud, horizon and sea clutter IRAMMP backgrounds.

关键词： Digital filtering Detection and tracking algorithms Target detection Image filtering Nonlinear filtering Clouds Filtering (signal processing) Linear filtering Infrared search and track algorithm development

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