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检索条件"任意字段=Digital Video Compression - Algorithms and Technologies 1996 Conference"

共 374 条记录，以下是91-100 订阅

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Adaptive depletion for improvement of MPEG video compression

Adaptive depletion for improvement of MPEG video compression

引用

digital video compression: algorithms and technologies 1996

作者： Tan, Daniel Venkatesh, Svetha West, Geoffrey A. Curtin Univ. of Technology Perth WA Aust

ISBN: (纸本)0819420425

Traditional data compression algorithms for 2D images work using the information theoretic paradigm, attempting to reduce redundant information by as much as possible. However, through the use of a depletion algorithm that takes advantage of characteristics of the human visual system, images can be displayed using only half or a quarter of the original information with no appreciable loss of quality.

关键词： video signal processing

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Two-layer video coding using pyramid structure for ATM networks

Two-layer video coding using pyramid structure for ATM netwo...

引用

conference on digital compression technologies and Systems for video Communications

作者： Lee, CB Hong, SH Park, RH ETRI NEW MEDIA SERV SECTTAEJON 305600SOUTH KOREA

ISBN: (纸本)0819423564

In transmission of image sequences over ATM networks, the channel sharing efficiency in packet loss conditions is important. As one of possible approaches two-layer video coding methods have been proposed. These methods transmit video information over the network with different levels of protection with respect to packet loss. In this paper, a two-layer coding method using pyramid structure is proposed and several realizations of two-layer video coding methods are presented and their performances are compared.

关键词： Image quality video coding Image transmission Image compression video Asynchronous transfer mode Image resolution Image processing Quantization Multiplexing

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MOTION-COMPENSATED INTERPOLATION USING TRAJECTORIES WITH ACCELERATION

MOTION-COMPENSATED INTERPOLATION USING TRAJECTORIES WITH ACC...

引用

conference on digital video compression - algorithms and technologies 1995

作者： CHAHINE, M KONRAD, J MCGILL UNIV DEPT ELECT ENGNMONTREALPQ H3E 2A7CANADA

ISBN: (纸本)0819417661

This paper is primarily concerned with motion-compensated interpolation of video sequences using multiple images. Due to the extended temporal support of such motion compensation, linear (constant-velocity) trajectory model is often inappropriate, for example due to insufficient temporal sampling. Recently, we have proposed a quadratic (constant-acceleration) trajectory model and a framework for the computation of its parameters. The approach is based on Markov random field models that lead to a regularized formulation solved by multiresolution deterministic relaxation. In this paper, we demonstrate advantages of using accelerated motion over linear trajectories in a plausible application using natural data. We apply the estimated trajectories to motion-compensated interpolation over multiple frames of progressive and interlaced video sequences. The experimental results for `Miss America' and `Femme et arbre' (interlaced) show, respectively, a 4 and 2 dB average improvement in the PSNR of the reconstruction error when quadratic trajectories are used instead of the linear ones. It is interesting to note that in `Miss America' the most significant improvements can be observed in the area of the mouth and the eyes which are in fact likely to exhibit acceleration. We envisage an application of the proposed method to post-processing in very low bit rate video coding.

关键词： MOTION MOTION ESTIMATION MOTION-COMPENSATED PROCESSING INTERPOLATION video CODING

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A MULTIRESOLUTIONAL REGION BASED SEGMENTATION SCHEME FOR STEREOSCOPIC IMAGE compression

A MULTIRESOLUTIONAL REGION BASED SEGMENTATION SCHEME FOR STE...

引用

conference on digital video compression - algorithms and technologies 1995

作者： SETHURAMAN, S SIEGEL, MW JORDAN, AG CARNEGIE MELLON UNIV SCH COMP SCIINST ROBOTDEPT ELECT & COMP ENGNPITTSBURGHPA 15213

ISBN: (纸本)0819417661

Stereoscopic image sequence transmission over existing monocular digital transmission channels, without seriously affecting the quality of one of the image streams, requires a very low bit-rate coding of the additional stream. Fixed block-size based disparity estimation schemes cannot achieve such low bit-rates without causing severe edge artifacts. Also, textureless regions lead to spurious matches which hampers the efficient coding of block disparities. In this paper, we propose a novel disparitybased segmentation approach, to achieve an efficient partition of the image into regions of more or less fixed disparity. The partitions are edge based, in order to minimize the edge artifacts after disparity compensation. The scheme leads to disparity discontinuity preserving, yet smoother and more accurate disparity fields than fixed block-size based schemes. The smoothness and the reduced number of block disparities lead to efficient coding of one image of a stereo pair given the other. The segmentation is achieved by performing a quadtree decomposition, with the disparity compensated error as the splitting criterion. The multiresolutional recursive decomposition offers a computationally efficient and non-iterative means of improving the disparity estimates while preserving the disparity discontinuities. The segmented regions can be tracked temporally to achieve very high compression ratios on a stereoscopic image stream. © 1995 SPIE. All rights reserved.

关键词： STEREOSCOPIC IMAGE compression DISPARITY ESTIMATION QUADTREE DECOMPOSITION SEGMENTATION MULTIRESOLUTION

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digital video compression on Personal Computers: algorithms and technologies

Digital Video Compression on Personal Computers: Algorithms ...

引用

digital video compression on Personal Computers: algorithms and technologies 1994

The proceedings contain 33 papers. The topics discussed include: JPEG image compression hardware implementation with extensions for fixed-rate and compressed-image editing applications;ASIC implementation of recursive scaled discrete cosine transform algorithm;video scene decomposition with the motion picture parser;method for extracting camera operations in order to describe subscenes in video sequences;hybrid DCT/quadtree motion-compensated coding of video sequences;applying mid-level vision techniques for video data compression and manipulation;software implementation of MPEG-II video encoding using socket programming in LAN;and statistical inverse discrete cosine transforms for image compression.

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Multi-Pass Encoding of Hyperspectral Imagery with Spectral Quality Control 21

Multi-Pass Encoding of Hyperspectral Imagery with Spectral Q...

引用

conference on algorithms and technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XXI

作者： Wasson, Steven Walker, William Appl Technol Associates Albuquerque NM 87123 USA

ISBN: (纸本)9781628415889

Multi-pass encoding is a technique employed in the field of video compression that maximizes the quality of an encoded video sequence within the constraints of a specified bit rate. This paper presents research where multi-pass encoding is extended to the field of hyperspectral image compression. Unlike video, which is primarily intended to be viewed by a human observer, hyperspectral imagery is processed by computational algorithms that generally attempt to classify the pixel spectra within the imagery. As such, these algorithms are more sensitive to distortion in the spectral dimension of the image than they are to perceptual distortion in the spatial dimension. The compression algorithm developed for this research, which uses the Karhunen-Loeve transform for spectral decorrelation followed by a modified H.264/Advanced video Coding (AVC) encoder, maintains a user-specified spectral quality level while maximizing the compression ratio throughout the encoding process. The compression performance may be considered near-lossless in certain scenarios. For qualitative purposes, this paper presents the performance of the compression algorithm for several Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) and Hyperion datasets using spectral angle as the spectral quality assessment function. Specifically, the compression performance is illustrated in the form of rate-distortion curves that plot spectral angle versus bits per pixel per band (bpppb).

关键词： hyperspectral image compression multi-pass encoding spectral quality control near-lossless compression H.264/AVC

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Structure-based fractal image coding

Structure-based fractal image coding

引用

conference on digital compression technologies and Systems for video Communications

作者： Titkov, B Tikhotskij, A Myboroda, A Buley, H TELEVIS RES INST NIITST PETERSBURGRUSSIA

ISBN: (纸本)0819423564

An image coding scheme using partitioned iterated function systems (fractal codec) is presented. It extends the usual block-based algorithms with quadtree partitioning by splitting with arbitrarily shaped masks. Besides the general advantages of fractal coding such as very high compression and scalable decoding this gives provision for shape- adaptive coding. Furthermore the usage of orthogonal luminance transformations results in code suitable for browsing. The codec now uses up to 256 masks at each level of the quadtree partition (up to four levels) which may be applied twice. The mask set was experimentally optimized on a set of images. The high degree of flexibility is handled besides the usage of the known 'multidimensional nearest neighbor search' by an estimation of useful masks based on a block-structure analysis. Fractal referencing to parts of the image already coded allows for additional reduction of data rate. Controlling takes into account the compression efficiency of the different types of approximation. The bit stream of the encoded image is structured, pre-encoded and selectivity entropy coded by arithmetic coding. Remaining blocking artifacts are concealed by a generally applicable method called bending, which is designed to avoid blurring by filtering.

关键词： image compression fractal coding block-boundary-artefact concealment

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METHOD FOR EXTRACTING CAMERA OPERATIONS TO DESCRIBE SUB-SCENES IN video SEQUENCES

METHOD FOR EXTRACTING CAMERA OPERATIONS TO DESCRIBE SUB-SCEN...

引用

conference on digital video compression on Personal Computers: algorithms and technologies

作者： MAEDA, J IBM JAPAN LTD TOKYO RES LABKANAGAWA 242JAPAN

ISBN: (纸本)0819414824

Numerous attempts have been made to detect scene changes in video sequences and to treat scenes as units, to allow handling of very large amounts of video data. But less attention has been given to the structure of scenes themselves. In this study, we define a "sub-scene" as a structural component of a scene in terms of camera operations. In other words, sub-scenes are subsets of scenes, and consist of successive frames in which the movements of the contents are almost identical. The advantage of sub-dividing scenes into sub-scenes is that it gives added power to description of objects and motion information. Up to now, the mainstream of research on estimating camera operations has been frame-by-frame analysis: that is, most studies have evaluated the difference between the contents of two frames at a time, and estimated camera motions by analyzing such differences over a period. Though these techniques can estimate camera operations accurately, they are generally time-consuming and may be greatly affected by noise, such as unintentional movements of the cameraman's hands, in a few frames of a sequence. In order to describe sub-scenes, the estimation of camera operations need not be very accurate, but it must be resistant to noise. The technique proposed in this paper for extracting camera operations, which processes more than two frames at a time by using a two-dimensional spatio-temporal image, meets the above requirement. It is also faster than conventional frame-by-frame analysis. The results of experiments indicate that the technique is both feasible and useful. © 1994 SPIE. All rights reserved.

关键词： Cameras

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Evaluation of lossless compression of teletext and graphics images for TV systems

Evaluation of lossless compression of teletext and graphics ...

引用

conference on digital compression technologies and Systems for video Communications

作者： deWith, PHN vanderSchaarMitrea, M PHILIPS RES LABS NL-5656 AA EINDHOVENNETHERLANDS

ISBN: (纸本)0819423564

The diversity in the nature of TV images is increasing due to the mixing of graphics data with natural scenery. In this paper we study the lossless coding of such graphics data with the objective to come to recommendations for video compression of such images. For this purpose, a comparison has been made between contour coding, template coding and run-length coding of graphical imagery. It is concluded that template coding is suitable for TXT-like images but it is not practical for more generic graphics images. For menus and similar imagery, contour and run-length coding provide interesting options.

关键词： TV image compression Teletext graphics contour template run length coding

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Vertex tracking for grid-based motion compensation

Vertex tracking for grid-based motion compensation

引用

conference on digital compression technologies and Systems for video Communications

作者： Schroder, K UNIV DORTMUND LEHRSTUHL NACHRICHTENTECHD-44221 DORTMUNDGERMANY

ISBN: (纸本)0819423564

To overcome some of the well-known artefacts stemming from block-based motion compensation, grid-based techniques have been proposed in the past as a promising alternative to block matching. While the latter is restricted to simple translational motion, grid-based compensation employs e.g. an affine model when triangular meshes are assumed. The theoretically superior model, however, will perform worse at object boundaries where the connectivity constraint of the meshes causes smoothing of the underlying discontinuous motion vector field. This effect can be diminished by providing an individual grid for each object in a scene. The crucial part of grid-based motion prediction is the technique of tracking mesh vertices. In contrast to block matching, motion estimation of vertices cannot be done independently without sacrificing prediction gain. This paper discuses different algorithms for vertex tracking. The issue of tracking at object boundaries and the influence of the resampling algorithm on the prediction gain are addressed in detail. Object grids, carrying both shape and motion information, are evaluated further in terms of shape coding efficiency and temporal scalability. Both aspects become important when aiming at functional coding for low bit rates, as it is currently being investigated in the framework of MPEG-4.

关键词： Stars Detection and tracking algorithms Convolution Motion estimation Distortion Motion models video Computer programming Volume rendering Fourier transforms

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