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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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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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video CODING WITH WAVELET TRANSFORM ON THE VERY-LOW BIT-RATE COMMUNICATION CHANNEL

VIDEO CODING WITH WAVELET TRANSFORM ON THE VERY-LOW BIT-RATE...

引用

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

作者： KIM, SW LEE, HK KOREA ADV INST SCI & TECHNOL DEPT COMP SCITAEJON 305701SOUTH KOREA

ISBN: (纸本)0819414824

In this paper, we present a moving image coding system which uses wavelet transform for the videophone on a very low bit rate communication channel (10 K bps PSTN). There are two requirements for our coding system: the good subjective quality for low bit rate coding and the suitability for progressive transmission. To satisfy the requirements, we use multifrequency motion estimation which estimates motion for each frequency bands. After the motion estimation, we can assign less bits to the motion estimation error in the high frequency bands because the human is insensitive to the change in high frequency components in the case of moving image. The experimental results confirm that our approach out-performs discrete cosine transform coding schemes in terms of the subjective quality because there are no blocking effects, and moreover, the wavelet transform in the approach supports the progressive transmission in itself.

关键词： Motion estimation Wavelet transforms Wavelets Image compression video coding video Image processing Image quality video compression Telecommunications

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TRANSFORM CODING FOR LOW BIT-RATE APPLICATIONS

TRANSFORM CODING FOR LOW BIT-RATE APPLICATIONS

引用

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

作者： PONCELEON, DB WANG, KS WU, H NORMILE, J APPLE COMP INC CUPERTINOCA 95014

ISBN: (纸本)0819414824

Low bit rate image coding at 10 kbit/s and less is a difficult problem and does not appear possible with the current generation of block transform based methods. Current research efforts center around the use of transforms with less objectionable artifacts such as wavelets or model based methods. We examine a method that is transform based but captures specific features of the image to be represented. The transform uses principal component analysis to generate a basis set specific to the particular class of images to be coded. We present results from a transform designed for use in a `talking head' sequence. Significant improvement in reconstructed quality is shown when perceptual weighting is used in generating the basis set. The appendix includes details of computationally efficient methods for deriving the basis set as well as a description of the weighting method.

关键词： Signal to noise ratio Mouth Head video Eye Image compression Detection and tracking algorithms Facial recognition systems Image quality Principal component analysis

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OPTIMIZED HYBRID TRANSFORM CODING FOR VERY-LOW BITRATE - videoTELEPHONY COMMUNICATION ON personal-COMPUTER

OPTIMIZED HYBRID TRANSFORM CODING FOR VERY-LOW BITRATE - VID...

引用

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

作者： EUDE, G SCHMITT, JC FRANCE TELECOM CTR NATL ETUDES TELECOMMUNF-92131 ISSY MOULINEAUXFRANCE

ISBN: (纸本)0819414824

This paper describes a "very low bitrate visual telephony application" demonstrator which was designed to be used on the Public Switched Telephony Network (PSTN) for many multimedia purposes. This development was done by CNET in coordination with the european COST211^ter project with the aim to demonstrate videotelephony at very low bit rates. The main concern was to optimize a video coding algorithm based on the CCITT H.261 existing standard and directly derived from the COST21 l^ter simulation model. The different signals which are needed for a videotelephony communication, video, speech, data and control are modulated and transmitted at a bitrate contained between 9.6 kbit/s and 28.8 kbit/s. The description of the demonstrator is given, including video algorithm and system multiplex specifications. The reasons of the choice of the video format and algorithm are also discussed. A friendly software application has been developed to run videotelephony within a Macintosh computer environment. This program uses the QuickTime routines to record and to play the videophone pictures to or from the hard disk. Single pictures or large sequences can be grabbed to the hard disk. Data can also be transmitted by opening, through the audio/video multiplex a data channel of some kbit/s in the video channel, allowing minimal groupware application. © 1994 SPIE. All rights reserved.

关键词： personal computers

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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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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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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...

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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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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