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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461-470 订阅

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video compression BY COEFFICIENT COMPENSATION

VIDEO COMPRESSION BY COEFFICIENT COMPENSATION

引用

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

作者： YAMAGUCHI, H TEXAS INSTRUMENTS INC TSUKUBA RES & DEV CTRTSUKUBAIBARAKI 305JAPAN

ISBN: (纸本)0819414824

This paper discusses a new video compression algorithm called Coefficient Compensation that achieves high performance by optimizing the DCT encoding loop structure, and demonstrates its improvement characteristic as compared with the conventional JPEG or MPEG I/P picture encoding under the condition that movement compensation is not available. The first part of the paper analyzes the performance of the DCT encoding loop structure, the method of optimization and the concept of soft-decision. The second part reports on the simulation results. Encoding performance is tested by various MPEG test sequences compressed in 20 Mbits/sec. The difference between JPEG and MPEG I is in the quantization table. For JPEG, the quantization table widely accepted as one producing a good compression quality is used. All the encoded binary outputs are fully compatible to the MPEG2 syntax but additional 2 bits/block information is coded as the user data for the Coefficient Compensation.

关键词： Computer programming video compression video Quantization Binary data Motion estimation Silicon video coding Algorithm development video processing

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A HIGH-PERFORMANCE video CODEC FOR CD-ROM BASED video PLAYBACK

A HIGH-PERFORMANCE VIDEO CODEC FOR CD-ROM BASED VIDEO PLAYBA...

引用

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

作者： WANG, KS NORMILE, JO WU, HJ APPLE COMP INC ADV TECHNOL GRPCUPERTINOCA 95014

ISBN: (纸本)0819414824

This paper discusses video compression and decompression strategies for use on general puipose computer systems where no specialized hardware is available. We first examine the alternatives and describe the performance and limitations of the first generation of such methods. A brief description is given of the possible algorithmic approaches. We introduce requirements for the encoder/decoder, and show that a vector quantization based scheme with image preprocessing and classification can provide the required performance. The remainder of the paper deals with the algorithm design and the tradeoffs made to meet the goals of realtime decode capability, compression ratio and image quality. Finally, we present results for the optimized algorithm and indicate areas which appear to be most promising for further work. © 1994 SPIE. All rights reserved.

关键词： CD-ROM

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JPEG IMAGE compression HARDWARE IMPLEMENTATION WITH EXTENSIONS FOR FIXED-RATE AND COMPRESSED IMAGE EDITING APPLICATIONS

JPEG IMAGE COMPRESSION HARDWARE IMPLEMENTATION WITH EXTENSIO...

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

作者： BOLIEK, M ALLEN, JD RYU, T SATO, Y HARA, J RICOH CALIF RES CTRMENLO PKCA

ISBN: (纸本)0819414824

This paper describes a new high speed image compression hardware implementation which, in addition to implementing the JPEG baseline system, can be used in fixed-rate compression systems and in systems that allow editing of compressed images. High speed (CCIR 601 resolution at 30 frames/second) and small silicon size are achieved by using a unique parameterized orthogonal transform. This implementation is compatible with the DCT, yet requires no additional multiplications. Also described here is a system that uses a dynamic quantization scalar circuit to achieve fixed-rate compression and a system that utilizes the `static coefficient DPCM' feature to compress and decompress regions of interest within an image for editing or viewing.

关键词： Image compression Quantization video Control systems video compression Image filtering Silicon Computing systems Image resolution video acceleration

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STATUS OF ITU AND ISO/MPEG4 video CODING STANDARDS AT VERY-LOW BIT RATES

STATUS OF ITU AND ISO/MPEG4 VIDEO CODING STANDARDS AT VERY-L...

引用

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

作者： SCHAPHORST, R READER, C DELTA INFORMAT SYST HORSHAMPA

ISBN: (纸本)0819414824

The goal of the ISO project, designated MPEG4, is to develop a generic video coding syntax suitable for a wide range of applications such as videophone via the PSTN and mobile radio, security systems, mobile experts, emergency monitoring, educational networks, and networked games. It is anticipated that the coding algorithm will be a significant advancement relative to the basic interframe predictive 8 X 8 DCT design which is used in most digital TV standards today. Examples of advanced coding techniques being considered include fractals, analysis/synthesis, knowledge-based, and semantic coding.

关键词： Standards development video coding video Semantic video Detection and tracking algorithms Fractal analysis Information security Network security Visualization Wireless communications

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STATISTICAL INVERSE DISCRETE COSINE TRANSFORMS FOR IMAGE compression

STATISTICAL INVERSE DISCRETE COSINE TRANSFORMS FOR IMAGE COM...

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

作者： HUNG, AC MENG, THY STANFORD UNIV INFORMAT SYST LABSTANFORDCA 94305

ISBN: (纸本)0819414824

The Discrete Cosine Transform (DCT) has been applied to image and image sequence compression to decorrelate the picture data before quantization. This decorrelation results in many of the quantized transform coefficients equaling zero, hence the compression gain. For the decoder, the very few, sparsely populated, non-zero transform coefficient can be utilized for great speed-up in the inverse DCT. This paper describes and compares two styles of implementations of fast inverse DCTs for sparse data. The first implementation that we call the symmetric mapped inverse DCT is based on the forward mapped inverse DCT, but our implementation is up to three times faster. The second implementation is based on a scaled inverse DCT, with detection of zero values. Both implementations are tested for speed against other algorithms, under varying degrees of DCT coefficient sparseness.

关键词： Transform theory Quantization Image compression Matrices Algorithm development Computer simulations Image processing Image transmission Switches video

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A FAST MOTION ESTIMATION ALGORITHM FOR AN MPEG video CODER

A FAST MOTION ESTIMATION ALGORITHM FOR AN MPEG VIDEO CODER

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

作者： CHAN, E GANDHI, R PANCHANATHAN, S UNIV OTTAWA DEPT ELECT ENGNMULTIMEDIA COMMUN RES LABOTTAWA K1N 6N5ONTARIOCANADA

ISBN: (纸本)0819414824

video compression is becoming increasingly important with the advent of the compression standards and broadband networks. Typical applications include high-definition television, multimedia communications, etc. There are two kinds of redundancies that exist in a video sequence, namely, temporal and spatial which are exploited to achieve compression. The spatial redundancies are removed by using techniques such as discrete cosine transform, vector quantization, etc. while the temporal redundancies are removed by the motion estimation/compensation techniques. Recently, several block based motion estimation algorithms have been reported in the literature. However, these algorithms are either computationally expensive or converge to a local optimum. In this paper, we propose a reduced complexity block-matching motion estimation algorithm for an MPEG video coder. This algorithm consists of a layered structure and hence does not converge to a local optimum. Most importantly, it employs a simple matching criterion, namely, the modified pixel difference classification (MPDC) and hence results in a reduced computational complexity. The MPEG video coder has been simulated using the proposed layered structure MPDC algorithm (LSA-MPDC). Simulation results indicate that the LSA-MPDC algorithm achieves a good performance for both slow and fast moving sequences. In addition, the hardware implementation of the LSA-MPDC algorithm is very simple because of the binary operations used in the matching criteria. © 1994 SPIE. All rights reserved.

关键词： digital television

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APPLYING MIDLEVEL VISION TECHNIQUES FOR video DATA-compression AND MANIPULATION

APPLYING MIDLEVEL VISION TECHNIQUES FOR VIDEO DATA-COMPRESSI...

引用

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

作者： WANG, JYA ADELSON, EH DESAI, U MIT MIT MEDIA LABDEPT ELECT ENGN & COMP SCICAMBRIDGEMA 02139

ISBN: (纸本)0819414824

Most image coding systems rely on signal processing concepts such as transforms, VQ, and motion compensation. In order to achieve significantly lower bit rates, it will be necessary to devise encoding schemes that involve mid-level and high-level computer vision. Model-based systems have been described, but these are usually restricted to some special class of images such as head-and-shoulders sequences. We propose to use mid-level vision concepts to achieve a decomposition that can be applied to a wider domain of image material. In particular, we describe a coding scheme based on a set of overlapping layers. The layers, which are ordered in depth and move over one another, are composited in a manner similar to traditional `cel' animation. The decomposition (the vision problem) is challenging, but we have attained promising results on simple sequences. Once the decomposition has been achieved, the synthesis is straightforward.

关键词： Motion models Image segmentation video Computer programming Affine motion model video compression Image compression Motion estimation Data compression video coding

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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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HYBRID DCT QUADTREE MOTION-COMPENSATED CODING OF video SEQUENCES

HYBRID DCT QUADTREE MOTION-COMPENSATED CODING OF VIDEO SEQUE...

引用

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

作者： LIU, S WANG, FM HEWLETT PACKARD CORP PALO ALTOCA 94304

ISBN: (纸本)0819414824

This paper proposes a hybrid DCT/Quadtree coding technique to compress motion compensated difference images for video conferencing applications. The hybrid scheme is developed primarily to eliminate the visually annoying `corona' effect caused by the traditional DCT coding of subimage blocks containing edge components. In this coding framework, the quadtree segmentation scheme is selected to compress edge blocks because of its ability to describe geometrical structures accurately. For quadtree coded blocks, each segmented subregion is represented by its associated sample mean, which is quantized and transmitted along with the segmentation pattern information to the receiver for reconstruction. The remaining subimage blocks are coded using the DCT. Simulation results demonstrate that this hybrid coding system provides a subjectively superior video quality than traditional DCT coding systems: the corona effect is virtually eliminated and the visible difference is most noticeable at low bit rates.

关键词： Quantization video coding Image segmentation video Computer programming Image compression Motion estimation video compression Distortion Receivers

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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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