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检索条件"主题词=Image processing algorithms and systems"

共 335 条记录，以下是191-200 订阅

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Robust real-time audiovisual face detection

Robust real-time audiovisual face detection

引用

Conference on Multisensor, Multisource Information Fusion

作者： Fang, WM Aarabi, P Univ Toronto Artificial Percept Lab Toronto ON M5S 3G4 Canada

ISBN: (纸本)0819453579

This paper presents a face detection system that synergizes audio localization and visual face detection. This audiovisual face detection system is based on microphone sound localization, and image processing algorithms. The system integrates the application of sound localization by Time Delay of Arrival and the iterative application of Adaptive Background Segmentation, to robustly perform real-time face detection on a stream of webcam images. Experimental results using an array of 24 microphones and a fixed-view webcam, show that the audiovisual face detection system is able to perform face detection of success rate 97.5% at 0.82 seconds of convergence time, and 5.8Hz display frame rate, on a Pentium IV 2.5GHz.

关键词： Facial recognition systems image segmentation Detection and tracking algorithms image processing image processing algorithms and systems System integration Visualization

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Community detection for fluorescent lifetime microscopy image segmentation

Community detection for fluorescent lifetime microscopy imag...

引用

Conference on Three-Dimensional and Multidimensional Microscopy - image Acquisition and processing XXI

作者： Hu, Dandan Sarder, Pinaki Ronhovde, Peter Achilefu, Samuel Nussinov, Zohar Washington Univ Dept Phys One Brookings DrCampus Box 1105 St Louis MO 63130 USA Washington Univ Sch Med Dept Radiol St Louis MO 63110 USA

ISBN: (纸本)9780819498625

Multiresolution community detection (CD) method has been suggested in a recent work as an efficient method for performing unsupervised segmentation of fluorescence lifetime (FLT) images of live cell images containing fluorescent molecular probes. 1 In the current paper, we further explore this method in FLT images of e x vivo tissue slices. The image processing problem is framed as identifying clusters with respective average FLTs against a background or "solvent" in FLT imaging microscopy (FLIM) images derived using NIR fluorescent dyes. We have identified significant multiresolution structures using replica correlations in these images, where such correlations are manifested by information theoretic overlaps of the independent solutions ("replicas") attained using the multiresolution CD method from different starting points. In this paper, our method is found to be more efficient than a current state-of-the-art image segmentation method based on mixture of Gaussian distributions. It offers more than 1 : 25 times diversity based on Shannon index than the latter method, in selecting clusters with distinct average FLTs in NIR FLIM images.

关键词： image segmentation Fluorescence lifetime imaging Near infrared 3D image processing Critical dimension metrology Expectation maximization algorithms Microscopy image processing algorithms and systems Tissues image resolution

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PHYSICS BASED SENSOR EFFECTS PREDICTION APPLIED TO A MULTISPECTRAL MINE DETECTION ALGORITHM

PHYSICS BASED SENSOR EFFECTS PREDICTION APPLIED TO A MULTISP...

引用

Conference on Detection Technologies for Mines and Minelike Targets

作者： WILLIAMS, B BLUME, B NICHOLS RES CORP SHALIMARFL 32579

ISBN: (纸本)0819418528

Coastal System Station, Panama City, Florida, is developing an airborne multispectral visible mine detection system for detecting minefields in littoral regions. Nichols Research Corporation (NRC) in support of CSS has been tasked to develop mine detection algorithms. NRC developed a generic baseline mine detection algorithm in order to provide a stable reference by which to measure other algorithms and enhancements. This algorithm has also served as a baseline to be modified and enhanced as the nature of the data is better understood and discrimination methodology is refined. The baseline algorithm is described in this paper along with modifications which significantly improve its robustness and with the analyses which motivated those modifications.

关键词： Detection and tracking algorithms image segmentation Algorithm development Mining Land mines Roads Cameras Sensors image processing image processing algorithms and systems

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FRACTAL-BASED MULTI-FEATURE TEXTURE DESCRIPTION

FRACTAL-BASED MULTI-FEATURE TEXTURE DESCRIPTION

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CONF ON image UNDERSTANDING FOR AEROSPACE APPLICATIONS

作者： KASPARIS, T TZANNES, NS BASSIOUNI, M CHEN, Q Univ. of Central Florida (United States)

ISBN: (纸本)081940649X

Fractal geometry receives recently increasing attention in analyzing natural scenes. The fractal dimension of a surface image has been used as segmentation feature, but since it is not sufficient to characterize important configurative texture characteristics, additional features are necessary. In this work we use a combination of fractal and non-fractal features to segment and classify natural textures.

关键词： Fractal analysis image segmentation image classification Aerospace engineering image understanding image processing algorithms and systems Convolution Mathematical modeling Matrices Visual process modeling

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DETERMINING WATERSHEDS IN DIGITAL PICTURES VIA FLOODING SIMULATIONS

DETERMINING WATERSHEDS IN DIGITAL PICTURES VIA FLOODING SIMU...

引用

CONF ON VISUAL COMMUNICATIONS AND image processing 90

作者： SOILLE, P VINCENT, L Ecole des Mines de Paris (France)

ISBN: (纸本)0819404217

The watershed transformation is a very powerful image analysis tool provided by mathematical morphology. However, most existing watershed algorithms are either too time consuming or insufficiently accurate. The purpose of this paper is to introduce a new and flexible implementation of this transformation. It is based on a progressive flooding of the picture and it works for n-dimensional images. Pixels are first sorted in the increasing order of their gray values. Then, the successive gray levels are processed in order to simulate the flooding propagation. A distributive sorting technique combined with breadth-first scannings of each gray level allow an extremely fast computation. Furthermore, the present algorithm is very general since it deals with any kind of digital grid and its extension to general graphs is straightforward. Its interest with respect to image segmentation is illustrated by the extraction of geometrical shapes from a noisy image, the separation of 3-dimensional overlapping particles and by the segmentation of a digital elevation model using watersheds on images and graphs.

关键词： image segmentation image processing image processing algorithms and systems Visual communications 3D image processing Algorithm development Digital imaging Particles image analysis Mathematical morphology

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ESTIMATION AND PREDICTION OF OBJECT-ORIENTED SEGMENTATION FOR VIDEO PREDICTIVE CODING

ESTIMATION AND PREDICTION OF OBJECT-ORIENTED SEGMENTATION FO...

引用

CONF ON VISUAL COMMUNICATIONS AND image processing : VISUAL COMMUNICATIONS

作者： BROFFERIO, SC COMUNALE, D TUBARO, S Politecnico di Milano (Italy) Univ. di Bari (Italy)

ISBN: (纸本)0819407429

The research proposes a simple finite state image model for estimating video sequence motion field, background memory updating and luminance prediction. The model allows object-oriented segmentation utilizing a fuzzy state (New-Scene) so that state transitions diagrams, modeling the physical constraints can be defined both for image segmentation and for luminance prediction. Preliminary results for integrated image segmentation and displacement fields estimations are presented. The proposed algorithm allows the implementation of video coding schemes where only structural prediction errors have to be transmitted, when physical motion coherence is plausible, and which is suited for completely parallel distributed processing.

关键词： image segmentation Visual communications Video coding image processing Video image processing algorithms and systems Video processing Surface plasmons Visualization Motion models

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VIDEO SCENE DECOMPOSITION WITH THE MOTION-PICTURE PARSER

VIDEO SCENE DECOMPOSITION WITH THE MOTION-PICTURE PARSER

引用

Conference on Digital Video Compression on Personal Computers: algorithms and Technologies

作者： DEARDORFF, E LITTLE, TDC MARSHALL, JD VENKATESH, D WALZER, R BOSTON UNIV DEPT ELECT COMP & SYST ENGNMULTIMEDIA COMMUN LABBOSTONMA 02215

ISBN: (纸本)0819414824

A motion picture can be modeled as a composition of many scenes where each scene is comprised of multiple shots. Thus, a conventional movie is a sequential aggregation of a large number of disparate image sequences. Within each image sequence or shot, there is consistency in image content and dynamics. This consistency in dynamics can be used in identifying scene changes for video segment decomposition and for techniques to improve data compression. We have developed an algorithm to use these dynamics for scene change detection and the decomposition of video streams into constituent logical shots. The algorithm uses intraframe image complexity and identifies scene transitions by considering short-term temporal dynamics. The algorithm has shown to be effective for detecting both abrupt scene changes (cuts) as well as smooth scene changes (fades and dissolves). This algorithm is used in an application we have developed called the Motion Picture Parser (MPP). The MPP automates the process of tagging segments of motion-JPEG-compressed movies. Segments are also tagged for subsequent semantic content-based retrieval in units of shots and scenes. The MPP application consists of a graphical user interface with various editing controls.

关键词： Video Data modeling Databases Video processing Video compression Control systems Motion models Algorithm development image processing algorithms and systems image segmentation

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HIGH-ACCURACY TARGET TRACKING ALGORITHM BASED ON DEVIATION VECTOR OF THE LOCAL WINDOW GRAY CENTER 5

HIGH-ACCURACY TARGET TRACKING ALGORITHM BASED ON DEVIATION V...

引用

CONF ON ACQUISITION, TRACKING, AND POINTING 5

作者： SHEN, ZK ZHAO, MS Changsha Institute of Technology (China)

ISBN: (纸本)0819405914

The paper presents a new high-accuracy automatic target tracking algorithm which does not involve image segmentation. The method constructs a function which is based on local gray- level information. The function can evaluate the deviation vector between the target's center and the tracking window center and then automatically adjust the tracking window iteratively towards the target's center to achieve automatic target tracking. The algorithm can achieve high tracking accuracy. It is not sensitive to noise and is not restrained by the movement pattern of the target. As the method does not use segment processing, it provides better real- time quality, a short processing period, and is very easily implemented. The implementation by the microcomputer image processing system demonstrates that the method is especially practical for infrared images and works well for infrared images in complex environment.

关键词： Detection and tracking algorithms Error analysis Automatic tracking Signal to noise ratio image segmentation image processing image processing algorithms and systems Statistical analysis Infrared imaging Infrared radiation

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MATCHING DATABASE RECORDS TO HANDWRITTEN TEXT

MATCHING DATABASE RECORDS TO HANDWRITTEN TEXT

引用

Conference on Document Recognition

作者： GANZBERGER, MJ ROVNER, RM GILLIES, AM HEPP, DJ GADER, PD CYBERNET SYST CORP ANN ARBORMI 48105

ISBN: (纸本)081941476X

This paper describes a method for matching specific database records to handwritten text. While a database record contains multiple fields with complete, idealized strings, handwritten text may contain missing fields, misspellings, and abbreviations. Multiple word segmentation hypotheses are used in this method to overcome the spacing difficulties of handwritten text. To avoid the combinatorics of matching all instantiations of the record, including abbreviations and omissions, to all hypothesized word segmentations, a dynamic programming approach is employed. Inputs to the matching module include a binarized line of handwritten text and a set of potential database records. The module determines the best word segmentation, or parse, of the line given a particular record and produces an overall verification score. This module was tested using binarized, handwritten address images captured from a live mail stream. Results of matching the street line images to postal database records are presented.

关键词： Databases image segmentation Computer programming Detection and tracking algorithms Legal Algorithm development image processing algorithms and systems image processing Roads Molybdenum

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Isotropic multiresolution analysis for 3D-textures and applications in cardiovascular imaging

Isotropic multiresolution analysis for 3D-textures and appli...

引用

Conference on Wavelets XII

作者： Alexander, Simon K. Azencott, Robert Papadakis, Manos Univ Houston Dept Math Houston TX 77204 USA

ISBN: (纸本)9780819468499

The main goal of this paper is to introduce formally the concept of texture segmentation/identification in three dimensional images. A major problem in texture texture segmentation/identification is the lack of robustness to both translations and rotations. This problem is more difficult to overcome in 3D-images, such as those generated by modalities such as x-ray CT and MRI. To facilitate 3D-texture segmentation/identification which is robust to 3D rigid motions we formally introduce the concept of steerable feature maps and of appropriate metrics in the feature space. We also introduce a new multiscale representation giving rise to a steerable feature map used in our exploratory project in cardiovascular imaging and we propose a 3D-texture segmentation algorithm utilizing this steerable feature map.

关键词： image segmentation Tissues Vector spaces Spherical lenses 3D modeling 3D image processing Cardiovascular magnetic resonance imaging image processing algorithms and systems Multiscale representation X-rays

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