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检索条件"任意字段=Proceedings - IEEE Computer Society Conference on Pattern Recognition and Image Processing."

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2nd ieee Pacific Rim conference on Multimedia, PCM 2001

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2nd ieee Pacific-Rim conference on Multimedia, ieee-PCM 2001

ISBN: (纸本)3540426809

The proceedings contain 157 papers. The special focus in this conference is on Wearable Computing, Retrieval Techniques, Coding Techniques and Systems. The topics include: Hardware platform for wearable computing research;automatic summarization of wearable video indexing subjective interest;a novel video retrieval method to support a user's recollection of past events aiming for wearable information playing;experience of immersive virtual world using cellular phone interface;toward human-centered interaction through wearable vision and visualization;face indexing and retrieval in personal digital album;an image retrieval system based on local and global color descriptors;a new shot boundary detection algorithm;an adaptive index structure for high-dimensional similarity search;combining hierarchical classifiers with video semantic indexing systems;dynamic multi-reference prediction in video coding for improved error resilience over internet;fast and robust sprite generation for mpeg-4 video coding;improved mpeg-4 visual texture coding using perceptual dithering for transparent image coding;a real-time large vocabulary continuous recognition system for Chinese sign language;object modeling, coding, and transmission for multimedia communications;live events accessing for multi-users with free viewpoints using stereo Omni-directional system;user modeling for efficient use of multimedia files;a feature-based vehicle tracking system in congested traffic video sequences;movie event detection by using audiovisual information;automatic segmentation and tracking of moving objects;interacting with 3d graphic objects in an image-based environment and robust head pose estimation using textured polygonal model with local correlation measure.

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RF/sup */IPF: A weighting scheme for multimedia information retrieval

RF/sup */IPF: A weighting scheme for multimedia information ...

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11th International conference on image Analysis and processing. ICIAP 2001

作者： Wang, James Z. Du, Yanping School of Information Sciences and Technology Pennsylvania State University University Park PA United States Department of Electrical Engineering Pennsylvania State University University Park PA United States Department of Computer Science and Engineering Pennsylvania State University United States Cisco Systems Inc. United States

ISBN: (纸本)076951183X

The region-based approach has become a popular research trend in the field of multimedia database retrieval. We present the Region Frequency and Inverse Picture Frequency (RF/sup*/IPF) weighting, a measure developed to unify region-based multimedia retrieval systems with text-based information retrieval systems. The weighting measure gives the highest weight to regions that occur often in a small number of images in the database. These regions are considered discriminators. With this weighting measure, we can blend image retrieval techniques with TF/sup*/IDF-based text retrieval techniques for large-scale Web applications. The RF/sup*/IPF weighting has been implemented as a part of our experimental SIMPLIcity image retrieval system and tested on a database of about 200000 general-purpose images. Experiments have shown that this technique is effective in discriminating images of different semantics. Additionally, the overall similarity approach enables a simple querying interface for multimedia information retrieval systems. © 2001 ieee.

关键词： Database systems

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Linear subspaces for illumination robust face recognition

Linear subspaces for illumination robust face recognition

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conference on computer Vision and pattern recognition (CVPR)

作者： A.U. Batur M.H.I.I.I. Hayes Center for Signal and Image Processing School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

ISBN: (纸本)0769512720

In this paper, we present a segmented linear subspace model for face recognition that is robust under varying illumination conditions. The algorithm generalizes the 3D illumination subspace model by segmenting the image into regions that have surface normals whose directions are close to each other. This segmentation is performed using a K-means clustering algorithm and requires only a few training images under different illuminations. When the linear subspace model is applied to the segmented image, recognition is robust to attached and cast shadows, and the recognition rate is equal to that of computationally more complex systems that require constructing the 3D surface of the face.

关键词： Lighting Robustness Face recognition image segmentation image recognition Clustering algorithms Light sources Signal processing image processing Shadow mapping

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Genetic algorithms for high-precision reconstructions of three-dimensional topographies using stereo fractographs

Genetic algorithms for high-precision reconstructions of thr...

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2nd International conference on Experimental Mechanics

作者： Komai, K Minoshima, K Suezaki, T Kyoto Univ Dept Mech Engn Kyoto 6068501 Japan

ISBN: (纸本)0819439983

A software is developed which enables reconstruction of the three-dimensional (3-D) shape of fracture surfaces without human assistance. It is based upon computer image processing.and pattern recognition techniques by using a stereo-pair of scanning electron micrographs. The processing.consists of two subprocesses: searching the matching points between two images and computation of heights using the relative shift of the matching points. By using the previously developed system, some mismatches were inevitable in the search process, in particular, for low-contrast SEM images such as striations, intergranular facets, and so on. In order to improve the accuracy of the search, a Genetic Algorithm (GA) was implemented into the developed system. By using the GA method, the 3-D shapes of a wide variety of fracture surfaces including cleavage failures, intergranular cracking dimples and fatigue striations, were successfully reconstructed with sufficient accuracy. The searching processes by the GA method and the previously developed two-step algorithm of coarse and close searching were compared. These proved that the GA method has the advantage of accuracy in the searching process and of short-run-time. A detailed 3-D shape, or more than a 120 x 120 reconstructed point-sized shape, was thus obtained with sufficient accuracy and with a relatively short-run-time.

关键词： fractography scanning electron microscopy stereography three-dimensional shape image processing genetic algorithm

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Optimization of liquid crystal displays behavior in optical image processing.and in diffractive optics

Optimization of liquid crystal displays behavior in optical ...

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conference on Optoelectronic Information processing.- Optics for Information Systems

作者： Campos, J Márquez, A Nicolás, J Moreno, I Iemmi, C Escalera, JC Davis, JA Yzuel, MJ Univ Autonoma Barcelona Dept Fis Bellaterra 08193 Spain

ISBN: (纸本)0819441236

In this paper we will revise the application of twisted nematic liquid crystal displays (TN-LCD) as spatial fight modulators (SLM) for image processing.and diffractive optics. In general two kind of responses are desired for the mentioned applications: amplitude-only and phase-only modulation. In general the users of commercially available LCDs do not know the optical properties of the used material. Thus, a reverse-engineering approach is needed to optimize the LCD response. First, we show a simplified model, that we recently proposed, for the orientation of the LC molecules. The model allows the determination of the physical parameters of the LCD by means of simple intensity measurements. Second, we demonstrate the capability of the model to provide very accurate predictions of the optical transmission. Therefore, we can perform computer searches for the optimum orientation of the added polarizing elements to obtain the required optical transmission. We demonstrate the need to insert wave plates in front and behind the LCD to obtain either amplitude-only or phase-only regimes with the LCD. Finally, we show the application of the optimized LCD to display images and filters in optical image processing. as well as we show the design of diffractive optical elements and apodizers.

关键词： spatial light modulators liquid crystal displays amplitude-only modulation phase-only modulation diffractive optical elements optical pattern recognition programmable apodizers correlation

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recognition of face profiles from the mugshot database using a hybrid connectionist/HMM approach

Recognition of face profiles from the mugshot database using...

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International conference on Acoustics, Speech, and Signal processing.(ICASSP)

作者： F. Wallhoff S. Muller G. Rigoll Department of Computer Science Faculty of Electrical Engineering Gerhard Mercator University of Duisburg Duisburg Germany

Biometrical systems have been the focus of concentrated research efforts in recent years. These systems can be used to identify a person or to grant a person access to something, e.g., a room. Face recognition technology has reached a level of performance at which frontal-view recognition of faces with slightly different facial expressions, view angles or head poses can be considered nearly solved. We present a novel hybrid ANN/HMM approach to recognize a person from that person's profile view (90) although the recognition system is trained with only one single frontal view of the person. Such a system can be useful for mugshot identification where a victim or witness has seen the criminal from the side only. Our approach uses neural methods in order to synthesize a profile out of the frontal view using no additional knowledge about the 3D shape and structure of a human head. The classification of the generated images is accomplished using a statistical HMM-approach.

关键词： Face recognition Hidden Markov models Head image databases computer science Focusing Shape Humans image generation pattern recognition

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A hierarchical framework for modal correspondence matching

A hierarchical framework for modal correspondence matching

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11th International conference on image Analysis and processing. ICIAP 2001

作者： Carcassoni, Marco Hancock, Edwin R. Department of Computer Science University of York York YO1 5DD United Kingdom

ISBN: (纸本)076951183X

The modal correspondence method of L.S. Shapiro and J.M. Brady (see image and Vision Computing, vol.10, p.283-8, 1992) aims to match point-sets by comparing the eigenvectors of a pairwise point proximity matrix. Although elegant by means of its matrix representation, the method is notoriously susceptible to differences in the relational structure of the point-sets under consideration. We demonstrate how the method can be rendered robust to structural differences by adopting a hierarchical approach. We place the modal matching problem in a probabilistic setting in which the arrangement of pairwise clusters can be used to constrain the individual point correspondences. We commence by using an iterative pairwise clustering method which can be applied to locate the main structure in the point-sets under study. Once we have located point clusters, we compute within-cluster and between-cluster proximity matrices. The modal coefficients for these two sets of proximity matrices are used to compute the probabilities that the detected cluster-centres are in correspondence and also the probabilities that individual points are in correspondence. We develop an evidence-combining framework which draws on these two sets of probabilities to locate point correspondences. In this way, the arrangement of the cluster-centre correspondences constrain the individual point correspondences. © 2001 ieee.

关键词： Probability

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High performance Chinese OCR based on Gabor features, discriminative feature extraction and model training

High performance Chinese OCR based on Gabor features, discri...

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International conference on Acoustics, Speech, and Signal processing.(ICASSP)

作者： Qiang Huo Yong Ge Zhi-Dan Feng Department of Computer Science and Information Systems University of Hong Kong Hong Kong China

We have developed a Chinese OCR engine for machine printed documents. Currently, our OCR engine can support a vocabulary of 6921 characters which include 6707 simplified Chinese characters in GB2312-80, 12 frequently used GBK Chinese characters, 62 alphanumeric characters, 140 punctuation marks and symbols. The supported font styles include Song, Fang Song, Kat, He, Yuan, LiShu, WeiBei, XingKai, etc. The averaged character recognition accuracy is above 99% for newspaper quality documents with a recognition speed of about 250 characters per second on a Pentium III-450 MHz PC yet only consuming less than 2 MB memory. We describe the key technologies we used to construct the above recognizer. Among them, we highlight three key techniques contributing to the high recognition accuracy, namely the use of Gabor features, the use of discriminative feature extraction, and the use of minimum classification error as a criterion for model training.

关键词： Feature extraction Optical character recognition software Character recognition Engines image segmentation Automatic speech recognition Vocabulary Helium image recognition pattern recognition

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Constructing Web-based legacy index card archives-architectural design issues and initial data acquisition 6

Constructing Web-based legacy index card archives-architectu...

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6th International conference on Document Analysis and recognition, ICDAR 2001

作者： Downton, A.C. Tarns, A.C. Wells, G.J. Holmes, A.C. Lucas, S.M. Beccaloni, G.W. Scoble, M.J. Robinson, G.S. Department of Electronic Systems Engineering University of Essex United Kingdom Department of Computer Science University of Essex United Kingdom Department of Entomology Natural History Museum London United Kingdom

ISBN: (纸本)0769512631

This paper presents a progress report (after 1 year of a 3 year project) on the overall design for a flexible archive conversion system, intended eventually for widespread use as a tool to convert legacy typescript and handwritten archive card indexes into Internet-accessible and searchable databases. The VIADOCS system is being developed and evaluated on a demonstrator archive of 30,000 pyraloid moth cards at the UK Natural History Museum, and has already demonstrated a successful and efficient mechanism for image acquisition using a modified bank cheque scanner. Document image processing.and analysis techniques, defined by an XML validating Document Type Definition (DTD), are being used to correct defects in the acquired images and parse card sequences to match the hierarchical taxonomy of pyraloid moth species. Parsed data is processed by offline OCR engines augmented by field-specific subject dictionaries to produce a 'draft' online archive. This archive will then be validated interactively via a web browser as it is used. It is hoped eventually to provide an efficient and configurable legacy archive document conversion system not only for the Natural History Museum, but also for all museums, libraries and archives where there is a need to interrogate legacy documents via computer. The current archive and project status can be viewed at: http://***/research/vasa/viadocs/***. © 2001 ieee.

关键词： XML

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Fast and reliable color region merging inspired by decision tree pruning

Fast and reliable color region merging inspired by decision ...

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conference on computer Vision and pattern recognition (CVPR)

作者： R. Nock Dépt Scientifique Inter Facultaire Université Antilles-Guyane Martinique France

ISBN: (纸本)0769512720

In this paper, we exploit some previous theoretical results about decision tree pruning to derive a color segmentation algorithm which avoids some of the common drawbacks of region merging techniques. The algorithm has both statistical and computational advantages over known approaches. It authorizes the processing.of 512/spl times/512 images in less than a second on conventional PC computers. Experiments are reported on thirty-five images of various origins, illustrating the quality of the segmentations obtained.

关键词： Merging Decision trees image segmentation image processing Humans Automation Pixel Parallel processing Testing Machine learning

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