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检索条件"任意字段=Storage and Retrieval for Image and Video Databases II 1994"

共 29 条记录，以下是11-20 订阅

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EFFICIENT CONTENT-BASED retrieval IN image databases - A PROBABILISTIC APPROACH 2

EFFICIENT CONTENT-BASED RETRIEVAL IN IMAGE DATABASES - A PRO...

引用

Conference on storage and retrieval for image and video databases ii

作者： RABITTI, F SAVINO, P CNR IST ELABORAZ INFORMAZI-56100 PISAITALY

ISBN: (纸本)0819414808

This paper describes the retrieval process from image databases, based on a partial match between the query and the images. The proposed approach allows to measure the similarity between the query and the images in the database and to retrieve those having the highest probability to be relevant. The paper describes the query processing and the access structures, based on the `signature method'. Four levels of signature files are associated to the image database and a signature is associated to the query. The query signature is compared with the image signatures in a four step image processing algorithm. The result of the process is a set of images with an associated recognition degree, measured by using information provided by the user during query formulation (such as importance of the presence of each object) and by using the image structure and the recognition degree associated to each object. The retrieved images are presented to the user in decreasing relevance order. The method described so far is inefficient, since the selection of most relevant images is executed among all relevant images (even those having a low relevance). The paper presents two approaches for improving the efficiency of query processing by (a) reducing the number of accesses to the image Database and (b) by reducing the number of accesses to the signature file. The two approaches are discussed in detail in the paper. The advantages and drawbacks of each method are illustrated.

关键词： image retrieval image processing databases image analysis image filtering Prototyping image enhancement Detection and tracking algorithms Silicon Analytical research

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SHAPE-ANALYSIS FOR image retrieval 2

SHAPE-ANALYSIS FOR IMAGE RETRIEVAL

引用

Conference on storage and retrieval for image and video databases ii

作者： TEGOLO, D UNIV PALERMO DEPT MATHI-90123 PALERMOITALY

ISBN: (纸本)0819414808

The main aim of this paper is to describe a method for locating a subimage of a stored image that approximately matches a given query image. This matching can support naive users in accessing an image database according to image contents rather symbolic attributes. The query image can be either composed using painting tools or cuts out of an actual scanned image. Our method is based on the extraction of features from the query image and from the stored images. The following three steps are involved: (1) an ISODATA algorithm is applied to segment (into region) both the query image and the stored images; (2) the normalized moment and geometrical features are computed from the segmented regions, and (3) a matching process is run on the resulting features to find those stored images which should be retrieved. The result is an ordered list of stored images or subimages from the database.

关键词： Prototyping image retrieval image segmentation Shape analysis Feature extraction image processing image processing algorithms and systems databases Algorithm development Machine vision

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MULTIRESOLUTION video INDEXING FOR SUBBAND CODED video databases 2

MULTIRESOLUTION VIDEO INDEXING FOR SUBBAND CODED VIDEO DATAB...

引用

Conference on storage and retrieval for image and video databases ii

作者： LEE, JW DICKINSON, BW PRINCETON UNIV DEPT ELECT ENGNPRINCETONNJ 08544

ISBN: (纸本)0819414808

In this paper we present a multiresolution approach for video indexing and feature matching of subband coded video databases. Subband coding refers to a coding technique where the input images are quantized after being decomposed into several narrow spatial frequency bands by filtering and decimation. Five different approaches were tested for scene change detection which is applied only on the lowest subband for computational efficiency. Two kinds of scene changes, abrupt and smoothly accumulated scene changes, mark the beginning of new scene segments. An index for each scene segment is the histogram of two representative frames, which we take to be the first and the last frame of the scene for simplicity. Using the approach of query by example, the index matching algorithm takes a multi-resolution approach by hierarchically comparing histograms at different resolutions. The search algorithm for the match between example query and its target scene segment starts from the coarsest resolution, and moves to the next finer resolution until a single match is obtained or the finest resolution is reached. Experimental results are presented, and the proposed indexing technique appears to be promising for its computational efficiency and its inherent hierarchical search procedure.

关键词： video Distance measurement image segmentation databases Linear filtering Motion measurement Detection and tracking algorithms Electronic filtering video compression image filtering

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REAL-TIME OBJECT EXTRACTION SYSTEM WITH SEQUENTIAL GROWING 2

REAL-TIME OBJECT EXTRACTION SYSTEM WITH SEQUENTIAL GROWING

引用

Conference on storage and retrieval for image and video databases ii

作者： NISHIMURA, R ODA, M NONAKA, S IMAIDE, T HITACHI LTD IMAGE & MEDIA SYST LABTOTSUKA KUYOKOHAMA 244JAPAN

ISBN: (纸本)0819414808

This paper describes a novel system for real-time object extraction from a moving video image. The object extraction method employed in this system has two features. The first one is multi-channel thresholding in a color space for extracting a target with several colors as a single object. The color space is normalized by luminance to make the process robust against light intensity fluctuations. The other feature is a key algorithm, called sequential growing, which exploits interfield correlation of a video image and realizes field-rate operation. In this algorithm, a binary image representing a target object is generated by growing an initially given mask image horizontally and vertically until whole object is extracted. We have also fabricated a 0.8 micrometers CMOS chip to incorporate the system into a compact video camera, which has successfully extracted objects in a number of general scenes.

关键词： video Cameras Detection and tracking algorithms Imaging systems Binary data image processing Signal processing Digital signal processing Feature extraction Seaborgium

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MOTION video ANALYSIS USING PLANAR PARALLAX 2

MOTION VIDEO ANALYSIS USING PLANAR PARALLAX

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Conference on storage and retrieval for image and video databases ii

作者： SAWHNEY, HS IBM CORP DIV RESALMADEN RES CTRSAN JOSECA 95120

ISBN: (纸本)0819414808

Motion and structure analysis in video sequences can lead to efficient descriptions of objects and their motions. Interesting events in videos can be detected using such an analysis--for instance independent object motion when the camera itself is moving, figure-ground segregation based on the saliency of a structure compared to its surroundings. In this paper we present a method for 3D motion and structure analysis that uses a planar surface in the environment as a reference coordinate system to describe a video sequence. The motion in the video sequence is described as the motion of the reference plane, and the parallax motion of all the non-planar components of the scene. It is shown how this method simplifies the otherwise hard general 3D motion analysis problem. In addition, a natural coordinate system in the environment is used to describe the scene which can simplify motion based segmentation. This work is a part of an ongoing effort in our group towards video annotation and analysis for indexing and retrieval. Results from a demonstration system being developed are presented.

关键词： video Motion analysis Cameras 3D modeling Direct methods Motion models 3D image processing Affine motion model Analytical research Roads

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SCALABLE video DATA PLACEMENT ON PARALLEL DISK ARRAYS 2

SCALABLE VIDEO DATA PLACEMENT ON PARALLEL DISK ARRAYS

引用

Conference on storage and retrieval for image and video databases ii

作者： CHANG, E ZAKHOR, A UNIV CALIF BERKELEY BERKELEYCA 94720

ISBN: (纸本)0819414808

We present three strategies for placement of video data on parallel disk arrays. Using a low- level disk model and video data from a scalable subband coding technique, we derive constraints with which to compare the three strategies. One strategy, constant frame grouping, is shown to be superior. Two methods for interleaving multiple videos under the constant frame grouping strategy are presented: nonperiodic and periodic. Periodic interleaving is shown to have the advantages of a lower access time and limited scan and pause functions. The constant frame grouping strategy is tested on an actual array of 8 disks and shown to have performance that is close to the theoretical prediction. The scalable nature of the compressed data is used to relieve the disk system overload for an overly high request rate.

关键词： video Neodymium video compression Data modeling Scalable video coding Data storage Performance modeling Switching Scattering Televisions

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COMPARISON OF SUBBAND FEATURES FOR AUTOMATIC-INDEXING OF SCIENTIFIC image databases 2

COMPARISON OF SUBBAND FEATURES FOR AUTOMATIC-INDEXING OF SCI...

引用

Conference on storage and retrieval for image and video databases ii

作者： PEREZLOPEZ, K SOOD, A GEORGE MASON UNIV CTR IMAGE ANALFAIRFAXVA 22030

ISBN: (纸本)0819414808

Indexing of scientific image databases is a difficult task, due to their extraordinary sizes and to the complex nature of the visual information contained in them. This data volume and complexity require an automatic indexing scheme that will categorize this visual content; without it, the data will be essentially useless to scientists and medical doctors. A method for automatic indexing of scientific image databases is presented which involves a wavelet package decomposition of images in the frequency domain, resulting in a quad-tree of subbands. These subbands are regarded as realizations of random fields, and statistical measures are computed on them. One class of newly derived measures determines whether the subbands contain any significant organization of pixels beyond what chance would imply. If this is found to be true for a subband, its node is retained on an index tree, and other identifying measurements may be added. The structure of the resulting pruned subband tree constitutes the first level of index; the node statistics form a second indexing level. Results of a pilot study are reported; they suggest that further investigation of this approach is warranted.

关键词： databases Electronic filtering Visualization Wavelets image filtering image processing Information visualization Earth observing sensors Satellite imaging Satellites

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DESIGN ISSUES FOR A DIGITAL X-RAY ARCHIVE ACCESSED OVER INTERNET 2

DESIGN ISSUES FOR A DIGITAL X-RAY ARCHIVE ACCESSED OVER INTE...

引用

Conference on storage and retrieval for image and video databases ii

作者： THOMA, GR LONG, LR BERMAN, LE NATL LIB MED LISTER HILL NATL CTR BIOMED COMMUNBETHESDAMD 20894

ISBN: (纸本)0819414808

The design of an electronic archive of digitized images of thousands of xrays collected as part of nationwide health surveys has raised several issues related to user interface design, image presentation and image compression. The project involves developing an image archive implemented with an optical disk jukebox, and user workstations that allow Internet access to the images. This paper describes: the physical layout design of the workstation screens; desirable image processing functions contributing to better viewing and minimizing artifacts; interface design factors contributing to ease-of-use and speed of task completion; and work toward the selection of a suitable image compression technique.

关键词： image processing Internet Sun Human-machine interfaces image compression image segmentation Control systems Spine databases Visualization

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image and video databases: Restoration, Watermarking and retrieval 1st Edition

引用

丛书名： Advances in image Communication Volume 8

2000年

作者： Hanjalic, A. Langelaar, G. C. Roosmalen, P. M. B. van

ISBN: (数字)9780080508474

ISBN: (纸本)9780444505026

This book provides an in-depth treatment of the three important topics related to image and video databases: restoration, watermarking and retrieval . It is the result of the participation of the Delft University of Technology in the European Union ACTS program, a pre-competitive R&D program on Advanced Communications Technologies and Services (1994-1998). In particular the book has benefited from participation in the AURORA and SMASH projects respectively automated film and video restoration and storage for multimedia systems (watermarking & retrieval).

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storage HIERARCHY FOR video-ON-DEMAND SYSTEMS 2

STORAGE HIERARCHY FOR VIDEO-ON-DEMAND SYSTEMS

引用

Conference on storage and retrieval for image and video databases ii

作者： SUZUKI, H NISHIMURA, K UEMORI, A SAKAMOTO, H NIPPON TELEGRAPH & TEL PUBL CORP HUMAN INTERFACE LABSMUSASHINOTOKYO 180JAPAN

ISBN: (纸本)0819414808

In this paper, we evaluate the performance of our trial hierarchical storage server by using simulation. Our system is composed of magnetic disk drives and an optical mass storage system (MSS). This is based on three key techniques: (1) multiple readout control using the time slot synchronous method, (2) quick access control of the MSS by using magnetic disk drives, (3) a storage hierarchy method for video programs that has three configurations. To verify the effectiveness of our storage hierarchy, we construct a queuing network simulation model of the system based on experimentally measured values, and analyze the average waiting time for each of the three configurations of video programs. Selecting the appropriate video program configuration shortens the average waiting time to half of previous times, with a quick access of less than 1 second, and with 8 simultaneous readouts. storage costs are reduced to about half that of magnetic disk drives only.

关键词： video Magnetism Optical discs Compact discs Local area networks Optical storage Telecommunications Control systems Data storage Interfaces

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