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检索条件"任意字段=Conference on Digital Video Compression - Algorithms and Technologies 1995"

共 189 条记录，以下是101-110 订阅

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REAL-TIME MPEG-1 SOFTWARE DECODING ON HP WORKSTATIONS

REAL-TIME MPEG-1 SOFTWARE DECODING ON HP WORKSTATIONS

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conference on digital video compression - algorithms and technologies 1995

作者： BHASKARAN, V KONSTANTINIDES, K LEE, R HEWLETT PACKARD LABS PALO ALTOCA 94303

ISBN: (纸本)0819417661

A MPEG1 codec that is capable of real-time playback of video and audio on HP's RISC-based workstations has been developed. Real-time playback is achieved by examining the complete MPEG1 decoding pipeline and optimizing the algorithms used for the various stages of the video and audio decompression process. For video decompression, efficient implementations are derived by examining the huffman decoder, inverse quantizer and inverse DCT as a single system. For audio decompression, by viewing the subband synthesis function in MPEG1 layer I and layer II decoding as a DCT, a fast 32-point DCT suitable for use in MPEG1 audio decompression has been developed. Besides algorithmic enhancements, in order to achieve real-time performance, minor changes to the CPU architecture and the display pipeline architecture were needed. The integration of algorithmic and architectural enhancements results in real-time playback of MPEG1 video and audio on HP's RISC based workstations.

关键词： video Multimedia video compression Computing systems Visualization video processing Data conversion Algorithm development Standards development video coding

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TEMPORAL SEGMENTATION OF videoS - A NEW APPROACH

TEMPORAL SEGMENTATION OF VIDEOS - A NEW APPROACH

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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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ACTIVE compression - A FRAMEWORK FOR video CONFERENCING AT VERY LOW BIT RATES

ACTIVE COMPRESSION - A FRAMEWORK FOR VIDEO CONFERENCING AT V...

引用

conference on digital video compression - algorithms and technologies 1995

作者： SIPITCA, M KLAUSUTIS, TJ MADISETTI, VK GEORGIA INST TECHNOL DEPT ELECT & COMP ENGNDIGITAL SIGNAL PROC LABATLANTAGA 30332

ISBN: (纸本)0819417661

videoconferencing is an application of video compression that is rapidly expanding in terms of market acceptance and importance. A number of recent papers discuss methods for very low bit rate videoconferencing between 10 - 20 kbps. In addition, telephone lines with state-of-the- art data modems are capable of transmitting data between 20 - 28 kbps. Since videoconferencing requires the transmission and reception of audio and video, the video component is likely to be restricted to about 20 kbps when using telephone lines. While these recent papers indicate acceptable quality for sequences such as `Miss America' for these very low bit rates, they also indicate higher data rates required for other sequences, that are characterized by excessive movement and/or details. In this paper, we are introducing a framework in which sequences that fall in this category are processed so that they match better the characteristics of the coder. However, this cannot be accomplished without reducing the amount of information in the sequence. The key is to make this in such a way as to produce the least subjectively perceptible distortion. Our experiments have shown that the subjective quality of the resulting sequence after active coding and decoding is better than that of the one resulting from standard coding and decoding.

关键词： video CONFERENCING CODING ACTIVE compression PREPROCESSING SUBJECTIVE QUALITY

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WAVELET CODEC FOR IMAGE SEQUENCE CODING AT VERY LOW BIT RATE WITH LOW LATENCY

WAVELET CODEC FOR IMAGE SEQUENCE CODING AT VERY LOW BIT RATE...

引用

conference on digital video compression - algorithms and technologies 1995

作者： ABRAHAM, S SEYTTER, F FRIEDRICH SCHILLER UNIV JENA DEPT MATH & INFORMATDIGITAL IMAGE PROC GRPD-07740 JENAGERMANY

ISBN: (纸本)0819417661

Wavelet theory provides an alternative approach to traditional DCT-based coding with properties that suggest an advantage over traditional schemes, especially for high compression ratios. This paper presents the design of an image coder for very low bit rates (8..64 kbit/s) which can be used for videophone applications. Apart from the image quality coding delay is an important critical factor. The coder performs a hybrid motion compensation/transform coding approach using a warping motion compensation to completely avoid blocking artifacts. Experiments using standard videophone test sequences show that the obtained image quality is similar to the best available results from DCT coders.

关键词： IMAGE compression VERY LOW BIT-RATE CODING WAVELETS LOW DELAY videoPHONE

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PERFORMANCE EVALUATION OF MPEG-2 FOR HDTV

PERFORMANCE EVALUATION OF MPEG-2 FOR HDTV

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conference on digital video compression - algorithms and technologies 1995

作者： LAUZON, D VINCENT, A WANG, L COMMUN RES CTR OTTAWAON K2H 8S2CANADA

ISBN: (纸本)0819417661

In this paper, we examine the subjective and the objective performance of MPEG-2 for HDTV. Tests were conducted on seven HDTV sequences selected to cover a wide range of conditions in terms of scene content, complexity and motion speed and direction. The selected material was digitized in 4:2:2 format with HDTV resolution and coded using MPEG-2 Man Profile/High Level syntax. Formal subjective assessment was performed by non-expert viewers on the sequences coded at a bit rate of 18 Mbits/s. Since MPEG-2 allows a great flexibility at the encoding end, we also examined the impact of various MPEG-2 encoding parameters on the quality of the reconstructed HDTV video sequences. The parameters include bit rate, the structure of picture organization, as well as temporal processing.

关键词： Signal to noise ratio video Computer programming video coding video compression Distortion Image resolution Motion estimation Standards development Image quality

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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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A SEGMENTATION BASED SCHEME FOR VERY LOW BIT-RATE video CODING

A SEGMENTATION BASED SCHEME FOR VERY LOW BIT-RATE VIDEO CODI...

引用

conference on digital video compression - algorithms and technologies 1995

作者： BHASKARAN, V LI, W KUNT, M HEWLETT PACKARD CORP PALO ALTOCA 94304

ISBN: (纸本)0819417661

A video coding/decoding system for very low bitrate video has been developed. This hybrid coding scheme employs intraframe and interframe coding techniques. For intraframe coding, a wavelet-based method is used. For interframe coding motionestimation is employed to compute the displaced frame differences (DFD) and the DFD image is coded using a segmentation based method wherein the displaced frame is segmented into active and inactive regions. To meet the low bit rate requirements the motion vectors are processed so as to reduce their contribution to the overall bitrate. Preprocessing techniques are also employed to generate a smooth motion-vector field. To reduce the coding artifacts, post-processing techniques have been developed for use at the decoder. In this paper, we present simulation results for several typical video sequences coded at 16 kbits/sec and at 32 kbits/sec. © 1995 SPIE. All rights reserved.

关键词： Image coding

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SEGMENTATION OF FRAMES IN A video SEQUENCE USING MOTION AND OTHER ATTRIBUTES

SEGMENTATION OF FRAMES IN A VIDEO SEQUENCE USING MOTION AND ...

引用

conference on digital video compression - algorithms and technologies 1995

作者： CHALOM, E BOVE, VM MIT MEDIA LABCAMBRIDGEMA 02139

ISBN: (纸本)0819417661

Motion-compensated video coders typically segment a scene into arbitrary tiles, resulting in a compressed bitstream which is not physically or semantically related to the scene structure. This paper presents a method for segmenting video frames and coding motion of regions, where the regions are defined in terms of a number of different properties. The goal is a video coder which gives good compression while identifying coherent regions in a manner useful for both human users and automated scene-understanding processes. Both a supervised and an unsupervised clustering algorithm are used to segment an image sequence; both algorithms make use of multiple features including motion, texture, position, and color. By utilizing both the structure and motion information, we preserve the semantic/structural content of the different regions, and simultaneously remove the redundancy (in successive frames) by describing the motion information in each region with a six-parameter affine model. In the supervised clustering algorithm, the first frame is manually segmented and used as training data. The classification of subsequent frames is done automatically, by using a MAP estimate, and modeling the n-dimensional feature-space as jointly Gaussian. The unsupervised algorithm is an iterative process that reassigns the classification of each point to the region corresponding to the nearest mean among each region of the segmentation from the previous iteration. In both algorithms, the distance and/or the mean is an n-dimensional measurement, n being the number of features used.

关键词： Image segmentation Optical flow video Motion models video compression Affine motion model Classification systems Image processing algorithms and systems Motion estimation Error analysis

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VOLUME DATA compression USING SMOOTHED PARTICLE TRANSFORMATION

VOLUME DATA COMPRESSION USING SMOOTHED PARTICLE TRANSFORMATI...

引用

conference on digital video compression - algorithms and technologies 1995

作者： NAGASAWA, M HITACHI CRL ULTRA HIGH SPEED NETWORK & COMP TECHNOL LABSTOKYO 185JAPAN

ISBN: (纸本)0819417661

In 3D entertainment oriented games, most geometrical objects are represented by polygon sets. Thus, the handling of polygons is highly optimized in the hardware of graphic workstations. However, 3D scientific simulations do not ordinarily use polygon data but rather volume data in its original form, such as the scalar array p(x,y,z). If we had an effective volume data compression algorithm and a standard way of representing this data, it could be used in a more efficient manner in the network environment. This paper presents a Smoothed Particle Transformation (SPT) algorithm for volume data at several levels of compressed resolution from an original array description of a given variable. Representing data at various levels of detail is important for archiving the huge data in the network environment. SPT contributes not only to data compression but also for resolution rearrangement. As a result, it speeds up of the visualization of transferred data, especially for the direct volume rendering of compressed data.

关键词： compression TRANSFORMATION VOLUME DATA

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MULTIPLICATION FREE SCALED 8X8 DCT ALGORITHM WITH 530 ADDITIONS

MULTIPLICATION FREE SCALED 8X8 DCT ALGORITHM WITH 530 ADDITI...

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conference on digital video compression - algorithms and technologies 1995

作者： KASPEROVICH, L MOSCOW SPACE RES INST MOSCOW 117810RUSSIA

ISBN: (纸本)0819417661

The known idea of the rational DCT computations employs multiply approximation, where overall accuracy is not affected due to the rounding-off and truncations, which are intrinsic to the quantization process in the image/video compression. Besides higher computational efficiency, the multiplication free scheme can take advantage of the full-length processor word of 32-bit or newest 64-bit microprocessors, being applied to the packed pixel pairs. In this paper we propose the scaled DCT algorithm, that uses 30 `essential' multiplications by (root)2 and 64 `non-essential' by three constants (which are closed to 5, 3 and 2). The number of additions in the approximation version of the algorithm is considerably fewer than in the known multiplication free 8 X 8 DCT computational scheme. Other advantage of the algorithm is its symmetry, i.e. almost all the computational modules used in both forward and inverse DCT implementations are the same rather than transpositional ones. A performance of the software implementations of MJPEG codec for Pentium PC, based on the algorithm presented, as well as its applicability to the high resolution software-only playback in various video standards, is also discussed.

关键词： video Quantization Image compression Multimedia Semantic video video compression Algorithm development Image processing LCDs Matrices

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