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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91-100 订阅

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SOFTWARE CODEC BASED FULL MOTION video CONFERENCING ON THE PC USING VISUAL PATTERN IMAGE SEQUENCE CODING

SOFTWARE CODEC BASED FULL MOTION VIDEO CONFERENCING ON THE P...

引用

Conference on digital video compression - algorithms and technologies 1995

作者： BARNETT, BS BOVIK, AC UNIV TEXAS DEPT COMP & ELECT ENGNAUSTINTX 78712

ISBN: (纸本)0819417661

This paper presents a real time full motion video conferencing system based on the Visual Pattern Image Sequence Coding (VPISC) software codec. The prototype system hardware is comprised of two personal computers, two camcorders, two frame grabbers, and an ethernet connection. The prototype system software has a simple structure. It runs under the Disk Operating System, and includes a user interface, a video I/O interface, an event driven network interface, and a free running or frame synchronous video codec that also acts as the controller for the video and network interfaces. Two video coders have been tested in this system. Simple implementations of Visual Pattern Image Coding and VPISC have both proven to support full motion video conferencing with good visual quality. Future work will concentrate on expanding this prototype to support the motion compensated version of VPISC, as well as encompassing point-to-point modem I/O and multiple network protocols. The application will be ported to multiple hardware platforms and operating systems. The motivation for developing this prototype system is to demonstrate the practicality of software based real time video codecs. Furthermore, software video codecs are not only cheaper, but are more flexible system solutions because they enable different computer platforms to exchange encoded video information without requiring on-board protocol compatible video codex hardware. Software based solutions enable true low cost video conferencing that fits the `open systems' model of interoperability that is so important for building portable hardware and software applications.

关键词： video CONFERENCING video compression HUMAN VISUAL SYSTEM

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WAVELET BASED SCALABLE IMAGE compression

WAVELET BASED SCALABLE IMAGE COMPRESSION

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Conference on digital video compression - algorithms and technologies 1995

作者： PANCHANATHAN, S JAIN, A UNIV OTTAWA DEPT ELECT ENGNMULTIMEDIA COMMUN RES LABOTTAWAON KN1 6N5CANADA

ISBN: (纸本)0819417661

In this paper, we present scalable image compression algorithms based on wavelet transform. Recently, the International Standard Organization (ISO) has proposed the JPEG standard for still image compression. JPEG standard not only provides the basic features of compression (baseline algorithm) but also provides the framework of reconstructing images in different picture qualities and sizes. These features are referred to as SNR and spatial scalability, respectively. Spatial scalability can be implemented using the hierarchical mode in the JPEG standard. However, the standard does not specify the downsampling filters to be used for obtaining the progressively lower size images. A straightforward implementation would employ mean downsampling filters. However, this filter does not perform very well in extracting the features from the full size image resulting in poor quality images and a lower compression ratio. We present a wavelet transform based technique for achieving spatial scalability (within the framework of hierarchical mode). Our simulation results confirm the substantial performance improvement and superior subjective quality images using the proposed technique. Most importantly, the wavelet based technique does not require any modifications to existing JPEG decoders.

关键词： Image compression Image quality Image filtering Spatial resolution Standards development Wavelet transforms Wavelets Image quality standards Signal to noise ratio Image resolution

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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...

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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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ASIC IMPLEMENTATION OF RECURSIVE SCALED DISCRETE COSINE TRANSFORM ALGORITHM

ASIC IMPLEMENTATION OF RECURSIVE SCALED DISCRETE COSINE TRAN...

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

作者： ON, BN NARASIMHAN, S HUANG, VKL NATL UNIV SINGAPORE INST MICROELECTRSINGAPORE 0511SINGAPORE

ISBN: (纸本)0819414824

A program to implement the Recursive Scaled Discrete Cosine Transform (DCT) algorithm as proposed by H. S. Hou has been undertaken at the Institute of Microelectronics. Implementation of the design was done using top-down design methodology with VHDL (VHSIC Hardware Description Language) for chip modeling. When the VHDL simulation has been satisfactorily completed, the design is synthesized into gates using a synthesis tool. The architecture of the design consists of two processing units together with a memory module for data storage and transpose. Each processing unit is composed of four pipelined stages which allow the internal clock to run at one-eighth (1/8) the speed of the pixel clock. Each stage operates on eight pixels in parallel. As the data flows through each stage, there are various adders and multipliers to transform them into the desired coefficients. The Scaled IDCT was implemented in a similar fashion with the adders and multipliers rearranged to perform the inverse DCT algorithm. The chip has been verified using Field Programmable Gate Array devices. The design is operational. The combination of fewer multiplications required and pipelined architecture give Hou's Recursive Scaled DCT good potential of achieving high performance at a low cost in using Very Large Scale Integration implementation.

关键词： Clocks Field programmable gate arrays Data storage video compression Microelectronics Very large scale integration video Computer architecture Data processing Image compression

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Image And video compression For Multimedia Engineering: Fundamentals, algorithms, And Standards, Second Edition (Image Processing Series) 2nd ed

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丛书名： Image Processing Series

2008年

作者： Yun Q. Shi Huifang Sun

ISBN: (纸本)9780849373640

Multimedia hardware still cannot accommodate the demand for large amounts of visual data. Without the generation of high-quality video bitstreams, limited hardware capabilities will continue to stifle the advancement of multimedia technologies. Thorough grounding in coding is needed so that applications such as MPEG-4 and JPEG 2000 may come to fruition. Image and video compression for Multimedia Engineering provides a solid, comprehensive understanding of the fundamentals and algorithms that lead to the creation of new methods for generating high quality video bit streams. The authors present a number of relevant advances along with international standards. New to the Second Edition A chapter describing the recently developed video coding standard, MPEG-Part 10 Advances video Coding also known as H.264 Fundamental concepts and algorithms of JPEG2000 Color systems of digital video Up-to-date video coding standards and profiles Visual data, image, and video coding will continue to enable the creation of advanced hardware, suitable to the demands of new applications. Covering both image and video compression, this book yields a unique, self-contained reference for practitioners tobuild a basis for future study, research, and development.

关键词： fundamentals algorithms engineering multimedia video compression image

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IMAGE compression FOR digital video TAPE-RECORDING WITH HIGH-SPEED PLAYBACK CAPABILITY 2

引用

CONF ON IMAGE PROCESSING algorithms AND TECHNIQUES

作者： WU, SW GERSHO, A Univ. of California/Santa Barbara (United States)

ISBN: (纸本)0819405515

In a digital video tape recorder (DVTR), the video data are stored serially on a sequence of parallel scan tracks running obliquely across the tape. In normal playback, the read heads scan along each track sequentially, while fast-forward is realized by a special subsampling process in which the read heads sweep across multiple tracks per scan and pick up a segment of data from each track to generate a patchwork quilt of subimages taken from successive fields. An image compression algorithm for DVTR is required to conform to the storage format implied by this fast-forward mechanism. Thus, a field of video is partitioned into a small number of subimages, each independently coded with a fixed number of bits. This requirement excludes the use of interframe coding and most variable-rate coding algorithms. We propose a new image coding algorithm that retains the efficiency of variable-rate coding while the above requirement is satisfied. In this algorithm a subimage is partitioned into non-overlapping 8 X 8 blocks, and each block is coded progressively by DCT and Vector Quantization to generate a finite set of candidate output blocks covering a range of bit rates. A procedure based on the Lagrange Multiplier method is used to select one of the candidate outputs for each 8 X 8 block such that the overall distortion is minimized subject to the constraint on the bit rate. Simulation results demonstrate the potential of this algorithm in image compression for DVTRs.

关键词： Image segmentation Image compression digital video recorders video compression video Distortion Image processing algorithms and systems Image processing Head Computer programming

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USING 4X4 DCTS AND MOVING 4X4 BLOCKS FOR SOFTWARE ONLY video DEcompression

USING 4X4 DCTS AND MOVING 4X4 BLOCKS FOR SOFTWARE ONLY VIDEO...

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

作者： WILSON, R ACORN COMP LTD CAMBRIDGE CB4 4AEENGLAND

ISBN: (纸本)0819414824

4 X 4 inverse DCTs are computationally twice as efficient as 8 X 8 inverse DCTs. In addition they have less register pressure, making the implementation more efficient for most processors. This extra computational efficiency places more pressure on improving the other components of the video decompression system. This paper describes a coding scheme for the quantized components which has an efficient decompression algorithm. The implementation of the inverse DCT is examined in detail, including removing all multiplication operations and replacing them with single CPU cycle shift-and-add operations. The data flow through a complete 4 X 4 DCT is described such that the results of intermediate 1 X 4 DCTs are written to and read from memory as efficiently as possible. A set of quantizers for the 4 X 4 DCT are presented which allow the decompression process to use shift-and-add instead of multiply. Efficient DCTs by themselves are not enough: the paper discusses the effects of changing the search area (in particular to being non-square) and shows a coding scheme suitable for fast decompression. It also discusses how to organize the block matching and that good results can be obtained if some pixels are allowed to match worse than the nominal value.

关键词： Quantization video Computer programming Data conversion Data storage Image stacking Computing systems Compact discs video compression Eye

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ISO IEC SOFTWARE IMPLEMENTATION OF MPEG-1 video

ISO IEC SOFTWARE IMPLEMENTATION OF MPEG-1 VIDEO

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

作者： FOGG, C AU, P ECKART, S HANAMURA, T OOSA, K QUANDT, B WATANABE, H UNIV WASHINGTON SEATTLEWA 98195

ISBN: (纸本)0819414824

The MPEG-1 video standard, ISO/IEC 11172 Part 2, specifies the syntax and the semantic rules by which bitstreams are generated in the encoder, and arithmetic rules by which pictures are reconstructed in the decoder. The actual encoder model is left open to the designer to choose among different cost and quality tradeoffs. An example encoder strategy is described in the informative annex D. A technical report giving a full encoder and decoder implementation expressed in the ANSI C programming language will become the fifth part of the ISO/IEC 11172 document. The encoder is based on a test model shaped by participants of the MPEG committee that produces good picture quality while exercising the full video syntax. The decoder employs full arithmetic accuracy at all stages, and include bitstream conformance checks. Finally, a companion systems codec demonstrates the temporal link between the systems and the video layers. To better serve as a learning tool for novices, the code is optimized for clarity rather than execution speed. In addition to an overview of the program, this paper provides a brief description of the encoder model.

关键词： Computer programming video Quantization Motion estimation Motion models Semantic video Image processing Systems modeling Compact discs Standards development

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video on phone lines: technology and applications

Video on phone lines: technology and applications

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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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Implementation of video compression for multimedia applications

Implementation of video compression for multimedia applicati...

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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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