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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271-280 订阅

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digital network for video surveillance and video distribution

Digital network for video surveillance and video distributio...

引用

Conference on digital compression technologies and Systems for video Communications

作者： Claus, HAI SIEMENS ATEA NV SA OPTOLAB 46400B-2200 HERENTALSBELGIUM

ISBN: (纸本)0819423564

Siemens Atea n.v. developed a digital 600 Mbps network based on a counter-rotating optical ring. On this network a video subsystem has been developed, based on M-JPEG compression technology. videostream switching has been integrated in the network. The resulting system can be used for video collection (surveillance) and for video distribution. This article describes some of the technical features of the system, and technology choices that have been made.

关键词： M-JPEG JPEG digital video video surveillance video distribution

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video interface technology for wireless communications 6

Video interface technology for wireless communications

引用

Conference on Advanced Signal Processing algorithms, Architectures, and Implementations VI

作者： Eldon, JA RAYTHEON ELECT SAN DIEGOCA 92121

ISBN: (纸本)0819422347

Emerging technology finally permits wireless communication systems to carry video information efficiently. System challenges include low-noise preprocessing to maximize compressibility, efficient compression, decompression, and error-correction of the compressed signal, and clean reconstruction of the video waveform. This paper discusses algorithms and hardware for clean, efficient conversion of signals between universal analog television formats and compression-ready or decompressed digital video component formats. Problems of gunlock jitter, video decoding, cross- luminance, and video filtering are considered.

关键词： video television genlock compression MPEG NTSC PAL jitter comb filter

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Parameter estimation in regularized reconstruction of BDCT compressed images for reducing blocking artifacts

Parameter estimation in regularized reconstruction of BDCT c...

引用

Conference on digital compression technologies and Systems for video Communications

作者： Mateos, J Katsaggelos, AK Molina, R UNIV GRANADA DEPT CIENCIAS COMPUTAC & IAGRANADA 18071SPAIN

ISBN: (纸本)0819423564

High compression ratios for both still images and sequences of images are usually achieved by discarding information represented by block discrete cosine transform (BDCT) coefficients which is considered unimportant. This compression procedure yields images that exhibit annoying block artifacts. In this paper we examine the reconstruction of BDCT compressed images which results in the removal of the blocking artifact. The method we propose for the reconstruction of such images, is based on a hierarchical Bayesian approach. With such an approach image and degradation models are required. In addition, unknown hyperparameters, usually the noise and image variances, have to be estimated in advanced or simultaneously with the reconstructed image. We show how to introduce knowledge about these parameters into the reconstruction procedure. The proposed algorithm is tested experimentally.

关键词： Image compression Reconstruction algorithms Image quality Distance measurement Quantization Virtual colonoscopy Visualization Matrices Radon Wavelets

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Object based very low bit rate coding with robust global motion estimation and background/foregound separation

Object based very low bit rate coding with robust global mot...

引用

Conference on digital compression technologies and Systems for video Communications

作者： Saflekos, A Strintzis, MG BenoisPineau, J Barba, D UNIV THESSALONIKI DEPT ELECT & ELECT ENGNINFORMAT PROC LABTHESSALONIKI 54006GREECE

ISBN: (纸本)0819423564

We present a two-step segmentation scheme for the very low bit rate coding of general purpose video scenes. Our objective is to determine the regions of interest before the actual segmentation procedure, so as to reduce the computational overhead introduced by this relatively complex process, and to avoid the phenomenon of over-segmentation of the scene. Simulation results show that the proposed scheme results in a radical reduction of the number of discrete spatio-temporal regions, while the background is identified as one uniform region, even when it is characterized by complex global motion.

关键词： Image segmentation Motion estimation video video coding Motion models Cameras Image processing algorithms and systems Computer simulations Image quality Visualization

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Implementation of video compression for multimedia applications

Implementation of video compression for multimedia applicati...

引用

Conference on digital Signal Processing Technology

作者： Porter, G HARRIS SEMICOND INC MULTIMEDIA PRODMELBOURNEFL 32902

ISBN: (纸本)0819421316

Various video compression techniques are introduced. The basic idea of Discrete Cosine Transform and Motion Estimation compression is outlined, and a detailed example of the decoding of an H.261 video bitstream is demonstrated. More advanced techniques for DCT/ME compression as used in MPEG-2 and H.263 are described. A discussion of video encoders and decoders highlights the fact that `standard- compliant' video systems can yield vastly different results depending on implementation techniques, such as the algorithms used, the use of accelerating hardware.

关键词： video conferencing compression multimedia DCT motion estimation trade-offs H.261 MPEG

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Evaluation of a mosaic based approach to video compression

Evaluation of a mosaic based approach to video compression

引用

1996 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP 96)

作者： Tannenbaum, B Suryadevara, R Hsu, S DAVID SARNOFF RES CTR PRINCETONNJ 08540

ISBN: (纸本)0780331923

There is great interest in the storage and browsing of large collections of video clips, due to the current explosion in demand for digital video. Many new algorithms and standards (MPEG, H.261, H.263, etc.) have been developed in recent years for the coding of video. However, most of these techniques lose performance when there exists significant camera motion, a common element of some classes of video such as surveillance and sporting events. A mosaic-based approach to video compression, initially presented by Irani, Hsu, and Anandan [1], creates a world-oriented panoramic representation of the scene for compression. This paper proposes and evaluates a specific mosaic-based algorithm for video compression that uses a static mosaic with a wavelet-based coding scheme for the mosaic and the temporal residual information. The mosaic-based approach is compared to a global motion compensation approach and the algorithms detailed in this paper are compared to the H.263 TMN5 coder.

关键词： Image compression

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video on phone lines: technology and applications

Video on phone lines: technology and applications

引用

digital video compression: algorithms and technologies 1996

作者： Hsing, T.Russell Bell Communications Research Morristown NJ USA

ISBN: (纸本)0819420425

Recent advances in communications signal processing and VLSI technology are fostering tremendous interest in transmitting high-speed digital data over ordinary telephone lines at bit rates substantially above the ISDN Basic Access rate (144 Kbit/s). Two new technologies, high-bit-rate digital subscriber lines and asymmetric digital subscriber lines promise transmission over most of the embedded loop plant at 1.544 Mbit/s and beyond. Stimulated by these research promises and rapid advances on video coding techniques and the standards activity, information networks around the globe are now exploring possible business opportunities of offering quality video services (such as distant learning, telemedicine, and telecommuting etc.) through this high-speed digital transport capability in the copper loop plant. Visual communications for residential customers have become more feasible than ever both technically and economically.

关键词： Teleconferencing

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Effective spatiotemporal interpolation algorithm for video pyramid coding

Effective spatiotemporal interpolation algorithm for video p...

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digital video compression: algorithms and technologies 1996

作者： Bayrakeri, Sadik D. Mersereau, Russell M. Georgia Inst. of Technology Atlanta GA USA

ISBN: (纸本)0819420425

A video interpolation algorithm for spatio-temporal video pyramid coding is presented. The temporal and the spatial predictions of the present frame are interactively combined to produce the best prediction of the present frame. For this purpose, the temporal prediction error variance and the lower resolution image variance are measured and compared for each region. The proposed region-based video interpolator is shown to give visually correct predicted images by minimizing the spatial and the temporal prediction artifacts such as aliasing, uncovered background and blocking effect. Promising results are obtained for lossy compression.

关键词： video signal processing

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Interactive optimization and massively parallel implementations of video compression algorithms

Interactive optimization and massively parallel implementati...

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International Conference on Image Processing (ICIP-96)

作者： Nicolas, H Jordan, F ECOLE POLYTECH FED LAUSANNE CRAY RESCH-1015 LAUSANNESWITZERLAND

ISBN: (纸本)0780332598

This paper presents a new technique which allows interactive optimization of video compression algorithms using massively parallel computers such as the CRAY T3D. This work aims to exploit as much as possible the parallel nature of digital image processing algorithms to obtain almost real-time computing with the flexibility of a software implementation. Thanks to this low computation time, interactive tools have been developed which allow easy and fast visual evaluation of image quality. This leads to significant productivity gain when developing new video compression techniques. Our approach has been validated on advanced region-based video compression algorithms. The interactive facilities offered by the proposed technique permit the accurate optimization of the algorithm parameters in few minutes, where several days were previously needed. Depending on the complexity of the compression algorithms, 8-12 images are compressed, decompressed and visualized per second.

关键词： Image compression

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Gradual cut detection using low level vision for digital video

Gradual cut detection using low level vision for digital vid...

引用

Conference on digital compression technologies and Systems for video Communications

作者： Lee, JH Choi, YS Jang, OB CHONBUK NATL UNIV DEPT COMP SCICHONJUSOUTH KOREA

ISBN: (纸本)0819423564

digital video computing and organization is one of the important issues in multimedia system, signal compression, or database. video should be segmented into shots to be used for identification and indexing. This approach requires a suitable method to automatically locate cut points in order to separate shot in a video. Automatic cut detection to isolate shots in a video has received considerable attention due to many practical applications; our video database, browsing, authoring system, retrieval and movie. Previous studies are based on a set of difference mechanisms and they measured the content changes between video frames. But they could not detect more special effects which include dissolve, wipe, fade-in, fade-out, and structured flashing. In this paper, a new cut detection method for gradual transition based on computer vision techniques is proposed. And then, experimental results applied to commercial video are presented and evaluated.

关键词： video video compression Databases Multimedia Cameras Motion measurement Image segmentation Motion estimation Visualization Computing systems

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