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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71-80 订阅

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HIGH PERFORMANCE SOFTWARE MPEG video PLAYER FOR PCS

HIGH PERFORMANCE SOFTWARE MPEG VIDEO PLAYER FOR PCS

引用

Conference on digital video compression - algorithms and technologies 1995

作者： ECKART, S FRAUNHOFER INST FESTKORPERTECHNOL D-80686 MUNICHGERMANY

ISBN: (纸本)0819417661

This presentation describes the implementation of the video part of a high performance software MPEG player for PCs, capable of decoding both video and audio in real-time on a 90 MHz Pentium system. The basic program design concepts, the methods to achieve high performance, the quality versus speed trade-offs employed by the program, and performance figures, showing the contribution of the different decoding steps to the total computational effort, are presented. Several decoding stages work on up to four data words in parallel by splitting the 32 bit ALU into four virtual 8 bit ALUs. Care had to be taken to avoid arithmetic overflow in these stages. The 8 X 8 inverse DCT is based on a table driven symmetric forward-mapped algorithm which splits the IDCT into four 4 X 4 DCTs. In addition, the IDCT has been combined with the inverse quantization into a single computational step. The display process uses a fast 4 X 4 ordered dither algorithm in YUV space to quantize the 24 bit 4:2:0 YUV output of the decoder to the 8 bit color lookup table hardware of the PC.

关键词： MPEG SOFTWARE DECODER PERSONAL COMPUTER video compression

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video SCENE DECOMPOSITION WITH THE MOTION-PICTURE PARSER

VIDEO SCENE DECOMPOSITION WITH THE MOTION-PICTURE PARSER

引用

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

作者： DEARDORFF, E LITTLE, TDC MARSHALL, JD VENKATESH, D WALZER, R BOSTON UNIV DEPT ELECT COMP & SYST ENGNMULTIMEDIA COMMUN LABBOSTONMA 02215

ISBN: (纸本)0819414824

A motion picture can be modeled as a composition of many scenes where each scene is comprised of multiple shots. Thus, a conventional movie is a sequential aggregation of a large number of disparate image sequences. Within each image sequence or shot, there is consistency in image content and dynamics. This consistency in dynamics can be used in identifying scene changes for video segment decomposition and for techniques to improve data compression. We have developed an algorithm to use these dynamics for scene change detection and the decomposition of video streams into constituent logical shots. The algorithm uses intraframe image complexity and identifies scene transitions by considering short-term temporal dynamics. The algorithm has shown to be effective for detecting both abrupt scene changes (cuts) as well as smooth scene changes (fades and dissolves). This algorithm is used in an application we have developed called the Motion Picture Parser (MPP). The MPP automates the process of tagging segments of motion-JPEG-compressed movies. Segments are also tagged for subsequent semantic content-based retrieval in units of shots and scenes. The MPP application consists of a graphical user interface with various editing controls.

关键词： video Data modeling Databases video processing video compression Control systems Motion models Algorithm development Image processing algorithms and systems Image segmentation

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RUNLENGTH ENCODING OF QUANTIZED DCT COEFFICIENTS

RUNLENGTH ENCODING OF QUANTIZED DCT COEFFICIENTS

引用

Conference on digital video compression - algorithms and technologies 1995

作者： RATNAKAR, V FEIG, E VISCITO, E KALLURI, S UNIV WISCONSIN DEPT COMP SCIMADISONWI 53706

ISBN: (纸本)0819417661

Runlength encoding is used in image and video compression methods to efficiently store quantized Discrete Cosine Transform (DCT) coefficients. The coefficients for each block are scanned in a zig-zag fashion, and runs of zeros are entropy coded. In this paper we present a comparison of the bit-rate resulting from runlength encoding with the bit-rate calculated as the coefficient-wise sum of entropies. Our experiments with several images show that the two are very close in practice. This is a useful result, for example, for designing quantization matrices to meet any bit-rate requirement. We also present an analytical framework to study these bit-rates. We consider two variants of runlength encoding. In the first one, the symbols that are entropy-coded are (runlength, value) pairs. In the second variant, which is the one used in JPEG, values are grouped together into categories based on magnitude. © 1995 SPIE. All rights reserved.

关键词： RUNLENGTH ENCODING DISCRETE COSINE TRANSFORM QUANTIZATION IMAGE compression JPEG MPEG HUFFMAN CODING

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DESIGN OF A MOTION JPEG (M/JPEG) ADAPTER CARD

DESIGN OF A MOTION JPEG (M/JPEG) ADAPTER CARD

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

作者： LEE, DH SUDHARSANAN, S IBM CORP HAWTHORNENY 10532

ISBN: (纸本)0819414824

In this paper we describe a design of a high performance JPEG (Joint Photographic Experts Group) Micro Channel adapter card. The card, tested on a range of PS/2 platforms (models 50 to 95), can complete JPEG operations on a 640 by 240 pixel image within 1/60 of a second, thus enabling real-time capture and display of high quality digital video. The card accepts digital pixels for either a YUV 4:2:2 or an RGB 4:4:4 pixel bus and has been shown to handle up to 2.05 MBytes/second of compressed data. The compressed data is transmitted to a host memory area by Direct Memory Access operations. The card uses a single C-Cube's CL550 JPEG processor that complies with the baseline JPEG. We give broad descriptions of the hardware that controls the video interface, CL550, and the system interface. Some critical design points that enhance the overall performance of the M/JPEG systems are pointed out. The control of the adapter card is achieved by an interrupt driven software that runs under DOS. The software performs a variety of tasks that include change of color space (RGB or YUV), change of quantization and Huffman tables, odd and even field control and some diagnostic operations.

关键词： video video compression Logic Control systems Computing systems Intelligence systems Human-machine interfaces Data storage Standards development Image quality

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IMPACT OF SCAN CONVERSION METHODS ON THE PERFORMANCE OF SCALABLE video CODING

IMPACT OF SCAN CONVERSION METHODS ON THE PERFORMANCE OF SCAL...

引用

Conference on digital video compression - algorithms and technologies 1995

作者： DUBOIS, E BAAZIZ, N MATTA, M INRS TELECOMMUN VERDUNPQ H3E 1H6CANADA

ISBN: (纸本)0819417661

The ability to flexibly access coded video data at different resolutions or bit rates is referred to as scalability. We are concerned here with the class of methods referred to as pyramidal embedded coding in which specific subsets of the binary data can be used to decode lower- resolution versions of the video sequence. Two key techniques in such a pyramidal coder are the scan-conversion operations of down-conversion and up-conversion. Down-conversion is required to produce the smaller, lower-resolution versions of the image sequence. Up- conversion is used to perform conditional coding, whereby the coded lower-resolution image is interpolated to the same resolution as the next higher image and used to assist in the encoding of that level. The coding efficiency depends on the accuracy of this up-conversion process. In this paper techniques for down-conversion and up-conversion are addressed in the context of a two-level pyramidal representation. We first present the pyramidal technique for spatial scalability and review the methods used in MPEG-2. We then discuss some enhanced methods for down- and up-conversion, and evaluate their performance in the context of the two-level scalable system.

关键词： video Scalable video coding Computer programming Image compression Linear filtering Spatial resolution video coding Binary data Image resolution video compression

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Pre-processing for video compression

Pre-processing for video compression

引用

1996 International Conference on Consumer Electronics (1996 ICCE)

作者： Dong, X FAROUDJA LABS SUNNYVALECA 94086

ISBN: (纸本)0780330293

In a digital video compression system, proper pre-processing is very important in terms of improving the picture quality and making the compression more efficient. In this paper, different pre-processing technologies are discussed, including composite video decoding, rate conversion, TBC and frame synchronization, noise reduction and film detection. The DFD-U, an decoder specially designed as the pre-processor for the compression system, is presented. It provides a bridge between the existing analog composite world and the digital compression world.

关键词： Image compression

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SINGLE-FRAME PREDICTION FOR HIGH video compression

SINGLE-FRAME PREDICTION FOR HIGH VIDEO COMPRESSION

引用

Conference on digital video compression - algorithms and technologies 1995

作者： LEONARDI, R UNIV BRESCIA DEPT ELECTR AUTOMATSIGNALS & COMMUN LABI-25123 BRESCIAITALY

ISBN: (纸本)0819417661

In this abstract, we present a novel technique to encode video sequences, that performs a region-based motion compensation of each frame to be encoded so as to generate a predicted frame. The set of regions to be motion compensated for a given frame has been obtained through a quadtree segmentation of the motion field estimated between a single reference frame (representing a typical projection of the scene) and the frame to be encoded. This way, no DPCM loop in the temporal domain is introduced, avoiding the feedback of the quantization errors. Under the assumption that the projection of the scene on the image plane remains nearly constant, only slight deformations of the reference frame occur from one frame to the next, so that very limited information needs to be coded: (1) the segmentation shape; (2) the motion information. Temporal correlation is used to predict both types of information so as to further reduce any left redundancy. As the segmentation may not be perfect, spatial correlation may still exist between neighboring regions. This is used in the strategy designed to encode the motion information. The motion and segmentation information are estimated on the basis of a two stage process using the frame to be encoded and the reference frame: (1) a hierarchical top-down decomposition, followed by (2) a bottom-up merging strategy. This procedure can be nicely embedded in a quadtree representation, which ensures a computationally efficient but rather robust segmentation strategy. We show how the proposed method can be used to encode QCIF video sequences with a reasonable quality at a 10 frame/s rate using roughly 20 kbit/s. Different schemes for prediction are compared pointing the advantage of the single reference frame for both prediction and compensation.

关键词： Image segmentation Motion estimation Motion models video video coding Quantization video compression Image compression Error analysis Reconstruction algorithms

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SOFTWARE IMPLEMENTATION OF MPEG-II video ENCODING USING SOCKET PROGRAMMING IN LAN

SOFTWARE IMPLEMENTATION OF MPEG-II VIDEO ENCODING USING SOCK...

引用

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

作者： YU, YB ANASTASSIOU, D COLUMBIA UNIV DEPT ELECT ENGNNEW YORKNY 10027

ISBN: (纸本)0819414824

This contribution will examine the parallel characteristics of MPEG video encoding and explore the feasibility of using a group of workstations under a LAN to perform MPEG-II encoding. An analysis of partitioning the MPEG algorithm into several tasks is presented. This is followed by the details of implementation by using socket programming as a means to coordinate the workstations. The following conclusions have been reached: (1) Since each slice header has a start code which is byte-aligned, each slice is a good basic unit for parallel processing. This is the case for I- P- and B-pictures. (2) All the most computationally expensive operations, such as Motion Estimation and DCT, can be conducted in parallel. (3) The quantization parameter is processed in a sequential manner since it should be derived from the history of the encoding. Computer simulations have been conducted, and the bitstreams generated are the same as those of a sequential encoder and can be decoded by an MPEG-II decoder.

关键词： Computer programming Image processing Parallel processing video coding Local area networks Motion estimation video Quantization Internet Computer simulations

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MOTION-COMPENSATED VISUAL-PATTERN IMAGE SEQUENCE CODING

MOTION-COMPENSATED VISUAL-PATTERN IMAGE SEQUENCE CODING

引用

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

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

ISBN: (纸本)0819414824

This paper presents an improved motion compensated version of the Visual Pattern Image Sequence Coding (VPISC) paradigm. It is a high performance video codec that is easily implemented in software. Software video codecs are not only cheaper, but are more flexible system solutions because they enable multi-vendor computers to exchange encoded video information without requiring on-board protocol compatible video codec hardware. The codec is intended for real-time desktop computer applications like multimedia delivery, and local area network (as well as point-to-point) televideo conferencing. We describe a version of motion compensated VPISC (MCVPISC) that has achieved bit rates of 0.025 bpp or better for MPEG test sequences (source coding has further reduced the bit rate by about half). The computational complexity of the encoder is less than 3 integer operations per pixel. The decoder is bounded between 0.016 and 0.125 logical and integer operations per pixel.

关键词： Visualization Image compression Computer programming Information visualization Image visualization Optical parametric oscillators video Image quality Motion estimation Visual process modeling

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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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