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检索条件"任意字段=Digital Video Compression - Algorithms and Technologies 1996 Conference"

共 374 条记录，以下是21-30 订阅

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NEW GENERATION OF REAL-TIME SOFTWARE-BASED video CODEC - POPULAR video CODER-II (PVC-II)

NEW GENERATION OF REAL-TIME SOFTWARE-BASED VIDEO CODEC - POP...

引用

conference on digital video compression - algorithms and technologies 1995

作者： HUANG, HC WU, JL NATL TAIWAN UNIV DEPT COMP SCI & INFORMAT ENGNCOMMUN & MULTIMEDIA LABTAIPEITAIWAN

ISBN: (纸本)0819417661

A new generation of real-time software-based video coder, the Popular video Coder II (PVC- II), is presented in the paper. The PVC-II simplifies the traditional video coder by removing the transform and the motion estimation parts and modifies the quantizer and entropy coder. Moreover, the PVC-II improves the coding performance of its previous version, the Popular video Coder, by introducing several newly developed efficient coding techniques, such as the adaptive quantizer, the adaptive resolution reduction and the fixed-model intraframe DPCM, into the codec. The coding speed, compression ratio and picture quality of the PVC-II are good enough for applying it to various real-time multimedia applications. Since no compression hardware is needed for the PVC-II to encode and decode video data, the cost and complexity of developing multimedia applications, such as video phone and multimedia e-mail systems, can be greatly reduced.

关键词： COMMUNICATIONS MULTIMEDIA SYSTEM SOFTWARE-BASED video compression video DATA compression video ON DEMAND video PHONE conference

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SCENE CHANGE DETECTION IN A MPEG COMPRESSED video SEQUENCE

SCENE CHANGE DETECTION IN A MPEG COMPRESSED VIDEO SEQUENCE

引用

conference on digital video compression - algorithms and technologies 1995

作者： MENG, JH JUAN, YJ CHANG, SF COLUMBIA UNIV DEPT ELECT ENGNNEW YORKNY 10027

ISBN: (纸本)0819417661

An algorithm is proposed for the detection of abrupt scene change and special editing effects such as dissolve in a compressed MPEG/MPEG-2 bitstream with minimal decoding of the bitstream. Scene changes are easily detected with DCT DC coefficients and motion vectors. By performing minimal decoding on the compressed bitstream, the processing speed for searching a video database of compressed image sequences can be dramatically improved. In addition, the algorithm may also be applied in video scene browsing and video indexing as well. © 1995 SPIE. All rights reserved.

关键词： video INDEXING SCENE CHANGE DETECTION COMPRESSED-DOMAIN EDITING MPEG COMPRESSED STREAMS

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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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ENCODING MOTION AND APPROXIMATE SEGMENTATION IN A SLICING FLOORPLAN TRESS STRUCTURE

ENCODING MOTION AND APPROXIMATE SEGMENTATION IN A SLICING FL...

引用

conference on digital video compression - algorithms and technologies 1995

作者： SCHWEITZER, H ZHANG, YJ UNIV TEXAS RICHARDSONTX 75083

ISBN: (纸本)0819417661

A new encoding scheme for motion and approximate scene segmentation in video sequences is described. The proposed segmentation partitions the scene into variable size rectangles that can be encoded efficiently in a data structure known as `a slicing floorplan tree' in VLSI design. The motion in each rectangle is represented by size parameters. We describe experiments comparing the compactness of this encoding to motion encoding in MPEG-1, and its quality to motion estimates obtained by standard computer vision techniques. These experiments establish two facts. (1) The proposed representation is flexible enough to describe motion as accurately as the output produced by the best motion algorithms developed by computer vision researchers. (2) The proposed representation is much more compact than the representation of motion in MPEG-1.

关键词： Computer programming Image segmentation Motion estimation Algorithm development video Computer vision technology Machine vision video coding Very large scale integration video compression

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Visual pattern-based motion estimation for video coding

Visual pattern-based motion estimation for video coding

引用

digital video compression - algorithms and technologies 1996 conference

作者： Zhong, S Chin, F UNIV HONG KONG DEPT COMP SCIHONG KONGHONG KONG

ISBN: (纸本)0819420425

Block matching algorithms (BMAs) are often employed for motion estimation (ME) in video coding. Most conventional BMAs treat the ME problem as an optimization problem and employ certain search schemes to find a solution. Except the time-consuming full search algorithms (FS), other fast algorithms such as the three step search (TSS), searching on a reduced search range, cannot guarantee optimal solutions, i.e., search is often trapped at local minima; the ME results are thus usually unsatisfactory. Few of them makes use of the information inherent in the images explicitly. We propose a new ME algorithm which can reduce the search range while guaranteeing global optimality in most cases. Microblock visual patterns are designed to extract edge information to guide block matching: searching is only carried out at places where the real match most likely happens; that is where similar edge features present. The proposed algorithm obtains a speed about 7 - 8 times as fast as that of FS with same search range. The prediction quality is very close to that of FS and much better than that of TSS. It can produce MPEG-1 or MPEG-2 compatible motion vectors, and can be extended to model-based ME. It is suitable for parallel implementation too. Moreover, the visual patterns are potential resources for video indexing to facilitate content-based information retrieval, which is important for applications such as VOD.

关键词： video compression motion estimation MPEG edge pattern visual feature

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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...

引用

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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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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RATE-QUANTIZATION MODELING FOR RATE CONTROL OF MPEG video CODING AND RECORDING

RATE-QUANTIZATION MODELING FOR RATE CONTROL OF MPEG VIDEO CO...

引用

conference on digital video compression - algorithms and technologies 1995

作者： DING, W LIU, BD PRINCETON UNIV DEPT ELECT ENGNPRINCETONNJ 08544

ISBN: (纸本)0819417661

For MPEG video coding and recording applications, it is important to select quantization parameters at slice and macroblock levels to produce nearly constant quality image for a given bit count budget. A well designed rate control strategy can improve overall image quality for video transmission over a constant-bit-rate channel and fulfill editing requirement of video recording, where a certain number of new pictures are encoded to replace consecutive frames on the storage media using at most the same number of bits. In this paper, we developed a feedback method with a rate-quantization model, which can be adapted to changes in picture activities. The model is used for quantization parameter selection at the frame and slice level. Extra computations needed are modest. Experiments show the accuracy of the model and the effectiveness of the proposed rate control method. A new bit allocation algorithm is then proposed for MPEG video coding.

关键词： RATE CONTROL MPEG video compression digital video CONSTRAINED QUANTIZATION

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TEMPORAL SEGMENTATION OF videoS - A NEW APPROACH

TEMPORAL SEGMENTATION OF VIDEOS - A NEW APPROACH

引用

conference on digital video compression - algorithms and technologies 1995

作者： CHERFAOUI, M BERTIN, C TMM CCETTF-35512 CESSONFRANCE

ISBN: (纸本)0819417661

Several works have been carried out to achieve automatic video segmentation into meaningful parts. video shots usually correspond to these meaningful parts. Many techniques have already been proposed1'2'3'4'5. Currently, finer segmentation ofvideos based on camera movements is sought. Figure 1 shows a video segmented as usual and in a finer way. Cameraoperation based segmentation allows us to better describe video contents for video-database applications5. It also allows to achieve semantic coding for very low bitrate video compression. In this paper, we propose a method that achieves automatic video segmentation based on camera movements. In section 2, we define a camera operations model. Using this model, we present in section 3 our video segmentation method. Experimental results are presented in section 4. Finally, we make a quick comparison of our method with the one presented in 6.

关键词： Cameras video video compression Zoom lenses Image segmentation Visualization Motion models Boron Optical flow Space operations

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