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Conference on Image Display

作者： Kitson, FL HEWLETT PACKARD LABS PALO ALTO CA 94304 USA

ISBN: (纸本)0819420824

The data types of graphics, images, audio and video or collectively multimedia are becoming standard components of most computer interfaces and applications. Medical imaging in particular will be able to exploit these capabilities in concert with the database engines or 'information furnaces' that will exist as part of the information superhighway. The ability to connect experts with patients electronically enables care delivery from remote diagnostics to remote surgery. Traditional visual computing tasks such as MRI, volume rendering, computer vision or image processing may also be available to more clinics and researchers as they become 'electronically local.' Video is the component of multimedia that provides the greatest sense of presence or visual realism yet has been the most difficult to offer digitally due to its high transmission, storage and computation requirements. Advanced 3D graphics have also been a scarce or at least expensive resource. This paper addresses some of the recent innovations in media processing and client/server technology that will facilitate PCs, workstations or even set-top/TV boxes to process both video and graphics in real-time.

关键词： Video Visualization Multimedia Video compression Video processing Image processing algorithm development Image compression Databases 3D image processing

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Extraction of structural features on SAR images: An adaptive version of the HK-Filter

Extraction of structural features on SAR images: An adaptive...

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Conference on Microwave Sensing and Synthetic Aperture Radar

作者： Taud, H Parrot, JF Univ. Mohammed V ORSTOM and Univ. Pierre et Marie Curie (France)

ISBN: (纸本)0819423629

The HK-Filter previously developed by the authors is a statistical filter devoted to the speckle removal and structural features enhancement on SAR images. As this filter is based on a pattern analysis applied to the shape observed in a given neighborhood and according to a gray-level range, it can be used to extract structural features. We purpose here to use spatial arrangement given by the occurrence of the constitutive elements of shapes, to extract and to differentiate the different structural features encountered on SAR images.

关键词： Speckle Synthetic aperture radar Feature extraction Binary data Image filtering Backscatter Radar algorithm development Shape analysis Statistical analysis

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Cross-phase repeat pass inteferometry with ERS SAR

Cross-phase repeat pass inteferometry with ERS SAR

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Microwave Sensing and Synthetic Aperture Radar

作者： Biondini, Fabio Solaas, Gaute A. University Tor Vergata Department of Informatics Systems and Production ESRIN ERS Exploitation Division Data Utilisation Section

There is no online version at this time. The PDF is only available to people who have bought the paper or have a subscription.

关键词： Synthetic aperture radar Coherence (optics) Interferometric synthetic aperture radar Interferometry Image processing Satellites algorithm development Doppler effect Image quality Sensors

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Simulator test and evaluation of a drowsy driver detection system and revisions to drowsiness detection algorithms

Simulator test and evaluation of a drowsy driver detection s...

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作者： Lewin, Mark Gustav Virginia Tech | University

This study was undertaken to simulator test and evaluate a complete drowsy driver detection system. The goal of the study was to recommend optimal specifications for a system to be further studied in an actual vehicle. The system used a set of algorithms developed from previously collected data and a set of previously optimized advisory tones, advisory messages, alarm stimuli, and drowsiness countermeasures. Detection occurred if eye closure or lane excursion exceeded predetermined thresholds. Data were obtained from six sleep-deprived subjects who drove a motion base automobile simulator late at night. Each subject was trained in carefully observing lane boundaries, using a device which sounded an alarm if lane boundaries were exceeded.

The performance aspect of the system dominated the detection process. None of the algorithms tracked well with the measures they were designed to estimate; correlations were much lower than expected. The algorithms relied heavily on the positioning of the vehicle relative to the lane.

关键词： test and evaluation alarms detection driver performance driver drowsiness algorithm development Thesis

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algorithm development FOR FUZZY MATHEMATICAL MORPHOLOGY 4

ALGORITHM DEVELOPMENT FOR FUZZY MATHEMATICAL MORPHOLOGY

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4TH CONF ON IMAGE ALGEBRA AND MORPHOLOGICAL IMAGE PROCESSING

作者： SINHA, D SINHA, P DOUGHERTY, ER CUNY/College of Staten Island (United States) Stevens Institute of Technology (Canada) Rochester Institute of Technology (United States)

ISBN: (纸本)0819412791

A general paradigm for lifting binary morphological algorithms to fuzzy algorithms is employed to construct fuzzy versions of several standard morphological operations. The lifting procedure is based upon an epistemological interpretation of both image and filter fuzzifications. algorithms are discussed for the following image processing tasks: shape detection, edge detection, and filtering union noise.

关键词： Fuzzy logic Binary data Image filtering Image processing algorithm development Edge detection Mathematical morphology Chemical elements Interference (communication) Standards development

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IMAGE ENCRYPTION METHOD USING A CLASS OF FRACTALS

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JOURNAL OF ELECTRONIC IMAGING 1995年第3期4卷 251-259页

作者： ALEXOPOULOS, C BOURBAKIS, NG IOANNOU, N SUNY BINGHAMTON DEPT ELECT ENGNAAAI LABBINGHAMTONNY 13902 UNIV PATRAS DEPT MATHGR-26500 PATRAIGREECE

We present a cryptographic scheme for encrypting 2-D gray scale images by using a large family of fractals. This scheme is based on a transposition of the image elements implemented by a generator of 2-D hierarchical scanning patterns producing a large subset of the (n(2))! possible orders defined on a 2-D image of n x n elements. Each pattern defines a distinct order of pixels and can be described by an expression, which is considered as the key of the transposition. This transposition cipher can easily be combined with various substitution ciphers, producing efficient product ciphers operating on pictorial data. Two such ciphers are constructed and their effects on real gray value images are shown. Encryption and decryption algorithms are derived from a parallel algorithm implementing the creation of the family of scanning patterns.

关键词： Image encryption Fractal analysis Composites Image processing Raster graphics Imaging arrays algorithm development Digital imaging Binary data Matrices

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COMPARATIVE PERFORMANCE EVALUATION OF VARIOUS FRINGE THINNING algorithmS IN PHOTOMECHANICS

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JOURNAL OF ELECTRONIC IMAGING 1995年第1期4卷 71-83页

作者： RAMESH, K SINGH, RK Indian Institute of Technology (India)

In recent years several algorithms have been reported for automating fringe data collection in photomechanics using the technique of digital image processing (DIP). Recent advances in phase shifting interferometry have offered some hope for full automation of static problems. However, for real-time dynamic studies conventional recording of fringes is a must. Fringe thinning is a very crucial step in extracting data for further processing. The various DIP algorithms for fringe thinning are surveyed and an attempt is made to explain better the mechanism of fringe skeleton extraction by various algorithms. The algorithm of Ramesh and Pramod is improved to extract fringe skeletons from saddle points in the fringe field. A comparative performance evaluation of these algorithms is discussed with respect to the quality and accuracy of fringe skeleton extracted and the processing time. Performance evaluation is done on a few computer-generated test images and also on images recorded by the technique of photoelasticity. The improved version of the algorithm of Ramesh and Pramod is found to give better fringe skeletons, it is also the fastest and the processing time is an order of magnitude less than the other algorithms. If is proposed that these computer-generated test images could be used as standard test images for checking the performance of any new fringe thinning algorithm.

关键词： Fringe analysis Detection and tracking algorithms Image processing Edge detection algorithm development Photoelasticity Binary data Image segmentation Moire patterns Digital image processing

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RECOGNITION OF A LOW-RESOLUTION DOCUMENT CONSISTING OF KOREAN AND ENGLISH CHARACTERS

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JOURNAL OF ELECTRONIC IMAGING 1995年第2期4卷 161-171页

作者： HAM, YK DOH, SY CHUNG, HK KIM, WS PARK, RH Sogang Univ. (South Korea)

We propose an efficient algorithm that recognizes handwritten Korean and English characters in a low-resolution document. For a user-friendly input system for low-resolution documents consisting of two different sets of characters obtained by a facsimile or scanner, we propose a document-recognition algorithm utilizing several effective features (partial projection, the number of cross points, and distance features) and the membership function of the fuzzy set theory. Via computer simulation with several test documents, we show the effectiveness of the proposed recognition algorithm for both printed and handwritten and Korean and English characters in a low-resolution document.

关键词： Detection and tracking algorithms Optical character recognition Fuzzy logic Visualization Scanners Evolutionary algorithms Binary data algorithm development Distortion Head

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DATA ASSOCIATION PROBLEMS POSED AS MULTIDIMENSIONAL ASSIGNMENT PROBLEMS - algorithm development 2

DATA ASSOCIATION PROBLEMS POSED AS MULTIDIMENSIONAL ASSIGNME...

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CONF ON SIGNAL PROCESSING, SENSOR FUSION, AND TARGET RECOGNITION 2

作者： POORE, AB RIJAVEC, N BARKER, TN MUNGER, M Colorado State Univ. (United States) Rome Labs. (United States)

ISBN: (纸本)0819411914

The ever-increasing demand in surveillance is to produce highly accurate target and track identification and estimation in real-time, even for dense target scenarios and in regions of high track contention. The use of multiple sensor, through more varied information, has the potential to greatly enhance target identification and state estimation. For multitarget tracking, the processing of multiple scans all at once yields high track identification. However, to achieve this accurate state estimation and track identification, one must solve an NP-hard data association problem of partitioning observations into tracks and false alarms in real-time. The primary objective in this work is to formulate a general class of these data association problems as a multidimensional assignment problem to which new, fast, near-optimal, Lagrangian relaxation based algorithms are applicable. The dimension of the formulated assignment problem corresponds to the number of data sets, and the constraints define a feasible partition of the data sets. The linear objective function is developed from Bayesian estimation and is the negative log likelihood function, so that the optimal solution yields the maximum likelihood estimate. After formulating this general class of problems, the equivalence between solving data association problems by these multidimensional assignment problems and by the currently most popular method of multiple hypothesis tracking is established. Track initiation and track maintenance using an N-scan sliding window are then used as illustrations.

关键词： Target detection Data fusion Logic Sensors algorithm development Detection and tracking algorithms Information operations Sensor fusion Composites Target recognition

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TONE DETECTION USING WAVELET TRANSFORMS 2

TONE DETECTION USING WAVELET TRANSFORMS

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2nd Conference on Wavelet Applications

作者： SHELBY, GA ADHAMI, RZ NICHOLS RES CORP HUNTSVILLEAL 35802

ISBN: (纸本)0819418447

Information regarding the pitch period of a speech signal is an important parameter in designing a speech recognition system for tone based languages such as Chinese. Chinese speech has four fundamental tone types: the tone for a given word is mainly characterized by its vowel section. The four tone types are distinct and can be recognized by examining the tone contour. Researchers have developed several different techniques for speech pitch detection. One recent technique is an event-based pitch detection scheme utilizing the dyadic wavelet transform (DyWT). This pitch detector compares maxima across wavelet scales to locate the beginning of each pitch period. We extend this pitch detection technique to a set of Chinese tone utterances using both the cubic spline wavelet and the Daubechies 4 wavelet. We investigate the impact of applying two preprocessing techniques, center clipping and half wave rectification, as well as several pitch decision logic methods. The DyWT performance is compared to an autocorrelation based pitch detector. The results show that the DyWT pitch detector compares favorably with the autocorrelation pitch detector, and has better performance for some cases. A variety of pitch decision logic techniques improve the DyWT pitch detector performance over the original method.

关键词： Wavelets Sensors Logic Error analysis Detection and tracking algorithms Wavelet transforms Sensor performance algorithm development Signal detection Speech recognition

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