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检索条件"任意字段=Digital Video Compression on Personal Computers: Algorithms and Technologies 1994"

共 36 条记录，以下是21-30 订阅

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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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COMPUTER-BASED TESTING OF digital video QUALITY

COMPUTER-BASED TESTING OF DIGITAL VIDEO QUALITY

引用

Conference on digital video compression on personal computers: algorithms and technologies

作者： CRESSY, CP BEAKLEY, GW STELLACOM INC ADV TELEVISION SYSTARLINGTONVA 22209

ISBN: (纸本)0819414824

Conventional analog video test measurements are generally not adequate for digital video, especially compressed video. This is because digital video distortion and artifacts often are spatially and temporally discrete phenomena. Most analog measurements assume that errors are of a continuous, linear nature. The only alternative to data has been subjective testing. Formal subjective tests (e.g., CCIR 500) can provide reliable, relative measures of video quality. However, such testing is time-consuming and expensive. Objective testing methods are needed to provide efficient, repeatable measures of video quality. A further advantage of objective testing is that it can provide greater insights into the nature of impairments. Presently, no standardized objective measures exist for digital video. However, pioneering work has been done by NTIA, NASA, ACATS and others to quantify the quality of digital video codecs. We have implemented some of the published measurements and others of our own design on a low-cost workstation. These measures utilize complex digital image processing techniques to analyze differences between source and processed video sequences. This paper presents formulations of these measurements and describes our implementation of an automated system to capture and test digital video quality.

关键词： video Distortion video compression Analog electronics Image registration Error analysis video processing Signal to noise ratio Image processing Computer programming

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Rate- And resolution-scalable 3-D subband coding of video

Rate- And resolution-scalable 3-D subband coding of video

引用

digital video compression on personal computers: algorithms and technologies 1994

作者： Taubman, David Zakhor, Avideh University of California BerkeleyCA94720 United States

We propose a full colour video compression strategy, based on 3-D subband coding with camera pan compensation, to generate a single embedded bit stream supporting multiple decoder display formats and a wide, finely gradated range of bit rates. An experimental implementation of our algorithm produces a single bit stream, from which suitable subsets are extracted to be compatible with many useful decoder frame sizes and frame rates and to satisfy transmission bandwidth constraints ranging from several tens of kilo-bits per second to several megabits per second. Reconstructed video quality from any of these bit stream subsets is often found to exceed that obtained from an MPEG-1 implementation, operated with equivalent bit rate constraints, in both perceptual quality and mean squared error. In addition, when restricted to two dimensions, the algorithm produces some of the best results available in still image compression. © 1994 SPIE. All rights reserved.

关键词： Image compression

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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...

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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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MODULATED LAPPED TRANSFORMS IN IMAGE-CODING

MODULATED LAPPED TRANSFORMS IN IMAGE-CODING

引用

Conference on digital video compression on personal computers: algorithms and technologies

作者： DEQUEIROZ, RL RAO, KR UNIV TEXAS DEPT ELECT ENGNARLINGTONTX 76019

ISBN: (纸本)0819414824

The class of modulated lapped transforms (MLT) with extended overlap is investigated in image coding. The finite-length-signals implementation using symmetric extensions is introduced and human visual sensitivity arrays are computed. Theoretical comparisons with other popular transforms are carried and simulations are made using intraframe coders. Emphasis is given in transmission over packet networks assuming high rate of data losses. The MLT with overlap factor 2 is shown to be superior in all our tests with bonus features such as greater robustness against block losses.

关键词： Transform theory Image compression Modulation Optical filters Linear filtering Signal to noise ratio Matrices Radon Visualization Prototyping

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

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

引用

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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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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MOTION ESTIMATION OPTIMIZATION IN A MPEG 1 LIKE video CODING SCHEME FOR LOW BITRATE APPLICATIONS

MOTION ESTIMATION OPTIMIZATION IN A MPEG 1 LIKE VIDEO CODING...

引用

Conference on digital video compression on personal computers: algorithms and technologies

作者： ROSER, M VILLEGAS, P TELEFON I&D E-28043 MADRIDSPAIN

ISBN: (纸本)0819414824

In this paper we present a work based on a coding algorithm for visual information that follows the International Standard ISO-IEC IS 11172, `Coding of Moving Pictures and Associated Audio for digital Storage Media up to about 1.5 Mbit/s', widely known as MPEG1. The main intention in the definition of the MPEG 1 standard was to provide a large degree of flexibility to be used in many different applications. The interest of this paper is to adapt the MPEG 1 scheme for low bitrate operation and optimize it for special situations, as for example, a talking head with low movement, which is a usual situation in videotelephony application. An adapted and compatible MPEG 1 scheme, previously developed, able to operate at px8 Kbit/s will be used in this work. Looking for a low complexity scheme and taking into account that the most expensive (from the point of view of consumed computer time) step in the scheme is the motion estimation process (almost 80% of the total computer time is spent on the ME), an improvement of the motion estimation module based on the use of a new search pattern is presented in this paper.

关键词： Diamond Motion estimation Computing systems Diamond patterning Visualization Information visualization Signal to noise ratio video coding Head Motion models

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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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ASIC IMPLEMENTATION OF RECURSIVE SCALED DISCRETE COSINE TRANSFORM ALGORITHM

ASIC IMPLEMENTATION OF RECURSIVE SCALED DISCRETE COSINE TRAN...

引用

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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