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

共 515 条记录，以下是301-310 订阅

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Rate-distortion optimal thresholding in SNR scalability based on 2D dynamic programming

Rate-distortion optimal thresholding in SNR scalability base...

引用

Conference on digital compression technologies and Systems for video Communications

作者： DeLameillieure, J HEINRICH HERTZ INST NACHRICHTENTECH BERLIN GMBH D-10587 BERLINGERMANY

ISBN: (纸本)0819423564

Thresholding is a technique for suppressing small transform coefficients in DCT-based coding. Recently, dynamic programming has been presented to optimize thresholding in a rate-distortion sense. This contribution investigates the extension of this method for SNR scalability. Because of the tight coupling between base and enhancement layer in SNR scalability, a 2D dynamic programming algorithm has been developed.

关键词： MPEG-2 compression scalability optimal thresholding dynamic programming

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Hierarchical hybrid video coding: Displaced frame difference coding

Hierarchical hybrid video coding: Displaced frame difference...

引用

Conference on digital compression technologies and Systems for video Communications

作者： Muller, F Illgner, K RHEIN WESTFAL TH AACHEN RHEIN WESTFAL TH AACHENINST ELEKT NACHRICHTENTECHD-52056 AACHENGERMANY

ISBN: (纸本)0819423564

A new method for coding of displaced frame differences (DFD) is proposed. It is in its main aspects close to the classical pyramid approach of Burt and Adelson. In particular a least squares L₂ Laplacian pyramid is employed which decomposes the DFD into several levels with differing spatial resolution. This pyramid is quantized and coded following a layered quantization approach together with a layered coding method based on conditional arithmetic coding. The DFD encoder outputs an embedded bit stream. Thus the coder control may truncate the bitstream at any point, and can keep a fixed rate. Simulation results show promising rate-distortion performance for low bit rate video coding.

关键词： lossy video compression pyramid decomposition displaced frame differences embedded coding conditional arithmetic coding

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Multiresolution transform and its application to video coding

Multiresolution transform and its application to video codin...

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digital compression technologies and Systems for video Communications

作者： Bonneau, Robert J. Columbia University Image and Advanced Television Laboratory Shapiro Research Bldg. 530 W. 120th Street New York NY 10027 United States

Traditional wavelet edge detection and encoding schemes preserve shape features of objects effectively at a variety of spatial scales and also allow an efficient means of image and video compression. However these schemes also remove texture from imagery and thus image reproduction quality suffers. Fractal encoding techniques on the other hand generate high compression ratios but tend to introduce blocky artifacts in imagery. Thus we describe a video encoding method that combines the shape preserving capability of wavelets with the compression qualities of fractal compression for a hybrid multiresolution technique that achieves high compression, selective and accurate feature preservation, and is computationally efficient. ©2005 Copyright SPIE - The International Society for Optical Engineering.

关键词： Image compression

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Frame rate conversion based on acceleration and motion-based segmentation

Frame rate conversion based on acceleration and motion-based...

引用

Conference on digital compression technologies and Systems for video Communications

作者： Csillag, P Boroczky, L KFKI RES INST MEASUREMENT & COMP TECHNIQUESH-1525 BUDAPESTHUNGARY

ISBN: (纸本)0819423564

Frame rate conversion requires interpolation of image frames at time instances, where the original sequence has not been sampled. This can be done in high quality only by means of motion-compensated algorithms, therefore the knowledge of motion present in the sequence is essential. This motion information has to be determined from the image sequence itself. In this paper a motion-based image segmentation algorithm is proposed, and its application for motion- compensated (MC) frame rate conversion is presented. The segmentation algorithm that can trace multiple rigid objects with translational movement, is based on vector quantization of the estimated motion field determining a set of global motion vectors and segmenting the images into multiple moving areas. Then, the spatial order of the objects (which one is in front of the other) is determined. Interpolation is performed based on the results of the segmentation, the set of motion vectors, and the proper handling of covered and uncovered areas. Furthermore, an accelerated motion model developed previously by the authors is applied, in order to further improve the performance of the MC frame rate converter.

关键词： frame rate conversion pel-recursive motion estimation motion-compensation frame interpolation accelerated motion motion-based segmentation video conversion low bitrate video coding motion trajectory optical flow

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Hierarchical hybrid video coding: Motion estimation and motion vector field coding

Hierarchical hybrid video coding: Motion estimation and moti...

引用

Conference on digital compression technologies and Systems for video Communications

作者： Illgner, K Muller, F RHEIN WESTFAL TH AACHEN RWTH AACHENINST ELEKT NACHRICHTENTECHD-52056 AACHENGERMANY

ISBN: (纸本)0819423564

In this and an accompanying paper in the same proceedings a hierarchical video coding scheme is presented which is designed mainly for video communications at very low bit rates and therefore based on the hybrid coding principle. Both the displacement vector field and the displaced frame differences are decomposed into a Laplacian-type pyramid, and these pyramids are encoded in an embedded fashion using zero-trees and conditioning contexts, respectively. The focus of this paper lies on the motion estimation and the design of the motion vector field coding. Especially, the aspect of estimating and coding vector fields of different resolution is investigated to achieve optimal coding efficiency in coding situations, where there is not enough data rate available to code higher resolution vector fields completely.

关键词： Motion estimation video coding Spatial resolution Motion models video Quantization Scalable video coding Forward error correction Image resolution Image compression

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Hardware adaptation layer for MPEG video recording on a helical scan-based digital data recorder

Hardware adaptation layer for MPEG video recording on a heli...

引用

digital video compression: algorithms and technologies 1996

作者： Ridder, Ad C. Kindt, S. Frimout, Emmanuel D. Biemond, Jan Lagendijk, Reginald L. Delft Univ. of Technology Delft Neth

ISBN: (纸本)0819420425

The forthcoming introduction of helical scan digital data tape recorders with high access bandwidth and large capacity will facilitate the recording and retrieval of a wide variety of multimedia information from different sources, such as computer data and digital audio and video. For the compression of digital audio and video, the MPEG standard has internationally been accepted. Although helical scan tape recorders can store and playback MPEG compressed signals transparently they are not well suited for carrying out special playback modes, in particular fast forward and fast reverse. Only random portions of a original MPEG bitstream are recovered on fast playback. Unfortunately these shreds of information cannot be interpreted by a standard MPEG decoder, due to loss of synchronization and missing reference pictures. In the EC-sponsored RACE project DART (digital Data Recorder Terminal) the possibilities for recording and fast playback of MPEG video on a helical scan recorder have been investigated. In the approach we present in this paper, we assume that not transcoding is carried out on the incoming bitstream at recording time, nor that any additional information is recorded. To use the shreds of information for the reconstruction of interpretable pictures, a bitstream validator has been developed to achieve conformance to the MPEG-2 syntax during fast playback. The concept has been validated by realizing hardware demonstrators that connect to a prototype helical scan digital data tape recorder.

关键词： videocassette recorders

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Least-squares spline interpolation for image data compression

Least-squares spline interpolation for image data compressio...

引用

Conference on digital compression technologies and Systems for video Communications

作者： Buscemi, M Fenu, R Giusto, DD Liggi, G UNIV CAGLIARI DEPT ELECT & ELECT ENGNI-09123 CAGLIARIITALY

ISBN: (纸本)0819423564

A new interpolation algorithm for 2D data is presented that is based on the least-squares minimization and the use of splines. This interpolation technique is then integrated into a double source decomposition scheme for image data compression. First, a least-squares interpolation is implemented and applied to a uniform sampling image. Second, the splines and the analysis of the entropy allow us to reconstruct the final image. Experimental results show that the proposed image interpolation algorithm is very efficient. The major advantages of this new method over traditional block-coding techniques are the absence of the tiling effect and a more effective exploitation of interblock correlation.

关键词： image interpolation data compression spline interpolation least-squares minimization two-source coding

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Rate-distortion optimizations for motion estimation in low-bit-rate video coding

Rate-distortion optimizations for motion estimation in low-b...

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digital video compression: algorithms and technologies 1996

作者： Hoang, Dzung T. Long, Philip M. Vitter, Jeffrey S. Brown Univ. Durham NC USA

ISBN: (纸本)0819420425

We make a case that taking the number of bits to code each motion vector into account when estimating motion for video compression results in significantly better performance at low bit rates, using simulation studies on established benchmark videos. First, by modifying a `vanilla' implementation of the H.261 standard, we show that choosing motion vectors explicitly to minimize rate (in a greedy manner), subject to implicit constraints on distortion, yields better rate-distortion tradeoffs than minimizing notions of prediction error. Locally minimizing a linear combination of rate and distortion results in further improvements. Using a heuristic function of the prediction error and the motion vector code-length results in compression performance comparable to the more computationally intensive coders while requiring a practically small amount of computation. We also show that making coding control decisions to minimize rate yields further improvements.

关键词： video signal processing

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Improving data caching for software MPEG video decompression

Improving data caching for software MPEG video decompression

引用

digital video compression: algorithms and technologies 1996

作者： Feng, Wu-chi Sechrest, Stuart Univ. of Michigan Ann Arbor MI USA

ISBN: (纸本)0819420425

Software implementations of MPEG decompression provide flexibility at low cost but suffer performance problems, including poor cache behavior. For MPEG video, decompressing the video in the implied order does not take advantage of coherence generated by dependent macroblocks and, therefore, undermines the effectiveness of processor caching. In this paper, we investigate the caching performance gain which is available to algorithms that use different traversal algorithms to decompress these MPEG streams. We have found that the total cache miss rate can be reduced considerably at the expense of a small increase in instructions. To show the potential gains available, we have implemented the different traversal algorithms using the standard Berkeley MPEG player. Without optimizing the MPEG decompression code itself, we are able to obtain better cache performance for the traversal orders examined. In one case, faster decompression rates are achieved by making better use of processor caching, even though additional overhead is introduced to implement the different traversal algorithm. With better instruction-level support in future architectures, low cache miss rates will be crucial for the overall performance of software MPEG video decompression.

关键词： video signal processing

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VLSI systems for image compression. A power-consumption/image-resolution trade-off approach

VLSI systems for image compression. A power-consumption/imag...

引用

Conference on digital compression technologies and Systems for video Communications

作者： Bracamonte, J Ansorge, M Pellandini, F UNIV NEUCHATEL INST MICROTECHNOLCH-2000 NEUCHATELSWITZERLAND

ISBN: (纸本)0819423564

Low power consumption is a requirement for any battery powered portable equipment. When designing ASICs for image and video compression, emphasis has been placed mainly on building circuits that are fast enough to satisfy the high data throughput associated with image and video processing. The imminent development of portable systems featuring full multimedia applications, adds the low-power constraint to the design of VLSI circuits for this kind of application. Several techniques such as lowering the supply voltage, architectural parallelization, pipelining etc., have been proposed in the literature to achieve low-power consumption. In this paper we report a VLSI circuit featuring a power management user-controllable technique that trades image quality for power consumption in a transform-based algorithm.

关键词： Very large scale integration Image compression Image quality Phase modulation Quantization Computer programming Microtechnology Image quality standards Image processing Image resolution

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